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re_variables.c
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/*
* ModSecurity for Apache 2.x, http://www.modsecurity.org/
* Copyright (c) 2004-2013 Trustwave Holdings, Inc. (http://www.trustwave.com/)
*
* 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
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Trustwave Holdings, Inc.
* directly using the email address [email protected].
*/
#include "http_core.h"
#include "modsecurity.h"
#include "apache2.h"
#include "re.h"
#include "msc_util.h"
#include "libxml/xpathInternals.h"
/**
* Generates a variable from a string and a length.
*/
static int var_simple_generate_ex(msre_var *var, apr_table_t *vartab, apr_pool_t *mptmp,
const char *value, int value_len)
{
msre_var *rvar = NULL;
if (value == NULL) return 0;
rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = value;
rvar->value_len = value_len;
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/**
* Generates a variable from a NULL-terminated string.
*/
static int var_simple_generate(msre_var *var, apr_table_t *vartab, apr_pool_t *mptmp,
const char *value)
{
if (value == NULL) return 0;
return var_simple_generate_ex(var, vartab, mptmp, value, strlen(value));
}
/**
* Validate that a target parameter is valid. We only need to take
* care of the case when the parameter is a regular expression.
*/
static char *var_generic_list_validate(msre_ruleset *ruleset, msre_var *var) {
/* It's OK if there's no parameter. */
if (var->param == NULL) return NULL;
/* Is it a regular expression? */
if ((strlen(var->param) > 2)&&(var->param[0] == '/')
&&(var->param[strlen(var->param) - 1] == '/'))
{ /* Regex. */
msc_regex_t *regex = NULL;
const char *errptr = NULL;
const char *pattern = NULL;
int erroffset;
pattern = apr_pstrmemdup(ruleset->mp, var->param + 1, strlen(var->param + 1) - 1);
if (pattern == NULL) return FATAL_ERROR;
regex = msc_pregcomp(ruleset->mp, pattern, PCRE_DOTALL | PCRE_CASELESS | PCRE_DOLLAR_ENDONLY, &errptr, &erroffset);
if (regex == NULL) {
return apr_psprintf(ruleset->mp, "Error compiling pattern (offset %d): %s",
erroffset, errptr);
}
/* Store the compiled regex for later. */
var->param_data = regex;
}
/* Simple string */
return NULL;
}
/* Custom parameter validation functions */
/* ARGS */
static int var_args_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
/* Loop through the arguments. */
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Figure out if we want to include this argument. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
/* Run the regex against the argument name. */
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->value;
rvar->value_len = arg->value_len;
rvar->name = apr_psprintf(mptmp, "ARGS:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* ARGS_COMBINED_SIZE */
static int var_args_combined_size_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
unsigned int combined_size = 0;
int i;
msre_var *rvar = NULL;
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
combined_size += arg->name_len;
combined_size += arg->value_len;
}
rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_psprintf(mptmp, "%u", combined_size);
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* ARGS_NAMES */
static int var_args_names_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Figure out if we want to include this variable. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->name;
rvar->value_len = arg->name_len;
rvar->name = apr_psprintf(mptmp, "ARGS_NAMES:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* ARGS_GET */
static int var_args_get_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
/* Loop through the arguments. */
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Only QUERY_STRING arguments */
if (strcmp("QUERY_STRING", arg->origin) != 0) continue;
/* Figure out if we want to include this argument. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
/* Run the regex against the argument name. */
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->value;
rvar->value_len = arg->value_len;
rvar->name = apr_psprintf(mptmp, "ARGS_GET:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* ARGS_GET_NAMES */
static int var_args_get_names_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Only QUERY_STRING arguments */
if (strcmp("QUERY_STRING", arg->origin) != 0) continue;
/* Figure out if we want to include this variable. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->name;
rvar->value_len = arg->name_len;
rvar->name = apr_psprintf(mptmp, "ARGS_GET_NAMES:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* ARGS_POST */
static int var_args_post_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
/* Loop through the arguments. */
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Only BODY arguments */
if (strcmp("BODY", arg->origin) != 0) continue;
/* Figure out if we want to include this argument. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
/* Run the regex against the argument name. */
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->value;
rvar->value_len = arg->value_len;
rvar->name = apr_psprintf(mptmp, "ARGS_POST:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* ARGS_POST_NAMES */
static int var_args_post_names_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
arr = apr_table_elts(msr->arguments);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_arg *arg = (msc_arg *)te[i].val;
int match = 0;
/* Only BODY arguments */
if (strcmp("BODY", arg->origin) != 0) continue;
/* Figure out if we want to include this variable. */
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, arg->name,
arg->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(arg->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = arg->name;
rvar->value_len = arg->name_len;
rvar->name = apr_psprintf(mptmp, "ARGS_POST_NAMES:%s", log_escape_nq_ex(mptmp, arg->name, arg->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* RULE */
static int var_rule_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_actionset *actionset = NULL;
if (rule == NULL) return 0;
actionset = rule->actionset;
if (rule->chain_starter != NULL) actionset = rule->chain_starter->actionset;
if ((strcasecmp(var->param, "id") == 0)&&(actionset->id != NULL)) {
return var_simple_generate(var, vartab, mptmp, actionset->id);
} else
if ((strcasecmp(var->param, "rev") == 0)&&(actionset->rev != NULL)) {
return var_simple_generate(var, vartab, mptmp, actionset->rev);
} else
if ((strcasecmp(var->param, "severity") == 0)&&(actionset->severity != -1)) {
char *value = apr_psprintf(mptmp, "%d", actionset->severity);
return var_simple_generate(var, vartab, mptmp, value);
} else
if ((strcasecmp(var->param, "msg") == 0)&&(actionset->msg != NULL)) {
return var_simple_generate(var, vartab, mptmp, actionset->msg);
} else
if ((strcasecmp(var->param, "logdata") == 0)&&(actionset->logdata != NULL)) {
return var_simple_generate(var, vartab, mptmp, actionset->logdata);
} else
if ((strcasecmp(var->param, "ver") == 0)&&(actionset->version != NULL)) {
return var_simple_generate(var, vartab, mptmp, actionset->version);
} else
if ((strcasecmp(var->param, "maturity") == 0)&&(actionset->maturity != -1)) {
char *value = apr_psprintf(mptmp, "%d", actionset->maturity);
return var_simple_generate(var, vartab, mptmp, value);
} else
if ((strcasecmp(var->param, "accuracy") == 0)&&(actionset->accuracy != -1)) {
char *value = apr_psprintf(mptmp, "%d", actionset->accuracy);
return var_simple_generate(var, vartab, mptmp, value);
}
return 0;
}
/* ENV */
static char *var_env_validate(msre_ruleset *ruleset, msre_var *var) {
if (var->param == NULL) {
return apr_psprintf(ruleset->mp, "Parameter required for ENV.");
}
if ((strlen(var->param) > 2)&&(var->param[0] == '/')
&&(var->param[strlen(var->param) - 1] == '/'))
{
return apr_psprintf(ruleset->mp, "Regular expressions not supported in ENV.");
}
return NULL;
}
static int var_env_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
char *value = get_env_var(msr->r, (char *)var->param);
if (value != NULL) {
return var_simple_generate(var, vartab, mptmp, value);
}
return 0;
}
/* REQUEST_URI_RAW */
static int var_request_uri_raw_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate(var, vartab, mptmp, msr->r->unparsed_uri);
}
/* UNIQUE_ID */
static int var_uniqueid_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
char *value = get_env_var(msr->r, "UNIQUE_ID");
if (value != NULL) {
return var_simple_generate(var, vartab, mptmp, value);
}
return 0;
}
/* REQUEST_URI */
static int var_request_uri_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp) /* dynamic */
{
char *value = NULL;
if (msr->r->parsed_uri.query == NULL) value = msr->r->parsed_uri.path;
else value = apr_pstrcat(mptmp, msr->r->parsed_uri.path, "?", msr->r->parsed_uri.query, NULL);
return var_simple_generate(var, vartab, mptmp, value);
}
/* REQBODY_PROCESSOR */
static int var_reqbody_processor_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
if (msr->msc_reqbody_processor == NULL) {
rvar->value = apr_pstrdup(mptmp, "");
rvar->value_len = 0;
} else {
rvar->value = apr_pstrdup(mptmp, msr->msc_reqbody_processor);
rvar->value_len = strlen(rvar->value);
}
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* SDBM_DELETE_ERROR */
static int var_sdbm_delete_error_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_psprintf(mptmp, "%d", msr->msc_sdbm_delete_error);
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* REQBODY_ERROR */
static int var_reqbody_processor_error_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_psprintf(mptmp, "%d", msr->msc_reqbody_error);
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* REQBODY_ERROR_MSG */
static int var_reqbody_processor_error_msg_generate(modsec_rec *msr, msre_var *var,
msre_rule *rule, apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
if (msr->msc_reqbody_error_msg == NULL) {
rvar->value = apr_pstrdup(mptmp, "");
rvar->value_len = 0;
} else {
rvar->value = apr_psprintf(mptmp, "%s", msr->msc_reqbody_error_msg);
rvar->value_len = strlen(rvar->value);
}
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* XML */
static char *var_xml_validate(msre_ruleset *ruleset, msre_var *var) {
/* It's OK if there's no parameter. */
if (var->param == NULL) return NULL;
/* ENH validate XPath expression in advance. */
return NULL;
}
static int var_xml_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
xmlXPathContextPtr xpathCtx;
xmlXPathObjectPtr xpathObj;
xmlNodeSetPtr nodes;
const xmlChar* xpathExpr = NULL;
int i, count;
/* Is there an XML document tree at all? */
if ((msr->xml == NULL)||(msr->xml->doc == NULL)) {
/* Sorry, we've got nothing to give! */
return 0;
}
if (var->param == NULL) {
/* Invocation without an XPath expression makes sense
* with functions that manipulate the document tree.
*/
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_pstrdup(mptmp, "[XML document tree]");
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
return 1;
}
/* Process the XPath expression. */
count = 0;
xpathExpr = (const xmlChar*)var->param;
xpathCtx = xmlXPathNewContext(msr->xml->doc);
if (xpathCtx == NULL) {
msr_log(msr, 1, "XML: Unable to create new XPath context.");
return -1;
}
/* Look through the actionset of the associated rule
* for the namespace information. Register them if any are found.
*/
tarr = apr_table_elts(rule->actionset->actions);
telts = (const apr_table_entry_t*)tarr->elts;
for (i = 0; i < tarr->nelts; i++) {
msre_action *action = (msre_action *)telts[i].val;
if (strcasecmp(action->metadata->name, "xmlns") == 0) {
char *prefix, *href;
if (parse_name_eq_value(mptmp, action->param, &prefix, &href) < 0) return -1;
if ((prefix == NULL)||(href == NULL)) return -1;
if(xmlXPathRegisterNs(xpathCtx, (const xmlChar*)prefix, (const xmlChar*)href) != 0) {
msr_log(msr, 1, "Failed to register XML namespace href \"%s\" prefix \"%s\".",
log_escape(mptmp, prefix), log_escape(mptmp, href));
return -1;
}
msr_log(msr, 4, "Registered XML namespace href \"%s\" prefix \"%s\".",
log_escape(mptmp, prefix), log_escape(mptmp, href));
}
}
/* Initialise XPath expression. */
xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
if (xpathObj == NULL) {
msr_log(msr, 1, "XML: Unable to evaluate xpath expression.");
xmlXPathFreeContext(xpathCtx);
return -1;
}
/* Evaluate XPath expression. */
nodes = xpathObj->nodesetval;
if (nodes == NULL) {
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return 0;
}
/* Create one variable for each node in the result. */
for(i = 0; i < nodes->nodeNr; i++) {
msre_var *rvar = NULL;
char *content = NULL;
content = (char *)xmlNodeGetContent(nodes->nodeTab[i]);
if (content != NULL) {
rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_pstrdup(mptmp, content);
xmlFree(content);
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
return count;
}
/* WEBSERVER_ERROR_LOG */
static int var_webserver_error_log_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
msre_var *rvar = NULL;
int i, count = 0;
for(i = 0; i < msr->error_messages->nelts; i++) {
error_message_t *em = (((error_message_t **)msr->error_messages->elts)[i]);
char *fem = NULL;
fem = format_error_log_message(mptmp, em);
if (fem != NULL) {
rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = apr_pstrdup(mptmp, fem);
rvar->value_len = strlen(rvar->value);
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 2
static int var_useragent_ip_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate(var, vartab, mptmp, msr->useragent_ip ? msr->useragent_ip : "0.0.0.0");
}
#endif
/* REMOTE_ADDR */
static int var_remote_addr_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
#if !defined(MSC_TEST)
#if AP_SERVER_MAJORVERSION_NUMBER > 1 && AP_SERVER_MINORVERSION_NUMBER > 3
if (ap_find_linked_module("mod_remoteip.c") != NULL) {
if(msr->r->useragent_ip != NULL) msr->remote_addr = apr_pstrdup(msr->mp, msr->r->useragent_ip);
return var_simple_generate(var, vartab, mptmp, msr->remote_addr);
}
#endif
#endif
return var_simple_generate(var, vartab, mptmp, msr->remote_addr);
}
/* REMOTE_HOST */
static int var_remote_host_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const char *value1 = ap_get_remote_host(msr->r->connection, msr->r->per_dir_config,
REMOTE_NAME, NULL);
return var_simple_generate(var, vartab, mptmp, value1);
}
/* REMOTE_PORT */
static int var_remote_port_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
char *value = apr_psprintf(mptmp, "%u", msr->remote_port);
return var_simple_generate(var, vartab, mptmp, value);
}
/* REMOTE_USER */
static int var_remote_user_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate(var, vartab, mptmp, msr->remote_user);
}
/* TX */
static int var_tx_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
arr = apr_table_elts(msr->tx_vars);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_string *str = (msc_string *)te[i].val;
int match;
/* Figure out if we want to include this variable. */
match = 0;
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, str->name,
str->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(str->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = str->value;
rvar->value_len = str->value_len;
rvar->name = apr_psprintf(mptmp, "TX:%s", log_escape_nq_ex(mptmp, str->name, str->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* GEO */
static int var_geo_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
arr = apr_table_elts(msr->geo_vars);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_string *str = (msc_string *)te[i].val;
int match;
/* Figure out if we want to include this variable. */
match = 0;
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, str->name,
str->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(str->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = str->value;
rvar->value_len = str->value_len;
rvar->name = apr_psprintf(mptmp, "GEO:%s", log_escape_nq_ex(mptmp, str->name, str->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* HIGHEST_SEVERITY */
static int var_highest_severity_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate(var, vartab, mptmp,
apr_psprintf(mptmp, "%d", msr->highest_severity));
}
/* IP */
static int var_ip_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
apr_table_t *target_col = NULL;
target_col = (apr_table_t *)apr_table_get(msr->collections, "ip");
if (target_col == NULL) return 0;
arr = apr_table_elts(target_col);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_string *str = (msc_string *)te[i].val;
int match;
/* Figure out if we want to include this variable. */
match = 0;
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, str->name,
str->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(str->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = str->value;
rvar->value_len = str->value_len;
rvar->name = apr_psprintf(mptmp, "IP:%s", log_escape_nq_ex(mptmp, str->name, str->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* MATCHED_VAR */
static int var_matched_var_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate_ex(var, vartab, mptmp,
apr_pmemdup(mptmp,
msr->matched_var->value,
msr->matched_var->value_len),
msr->matched_var->value_len);
}
/* MATCHED_VAR_NAME */
static int var_matched_var_name_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
return var_simple_generate_ex(var, vartab, mptmp,
apr_pmemdup(mptmp,
msr->matched_var->name,
msr->matched_var->name_len),
msr->matched_var->name_len);
}
/* SESSION */
static int var_session_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
apr_table_t *target_col = NULL;
target_col = (apr_table_t *)apr_table_get(msr->collections, "session");
if (target_col == NULL) return 0;
arr = apr_table_elts(target_col);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_string *str = (msc_string *)te[i].val;
int match;
/* Figure out if we want to include this variable. */
match = 0;
if (var->param == NULL) match = 1; /* Unconditional inclusion. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, str->name,
str->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(str->name, var->param) == 0) match = 1;
}
}
/* If we had a match add this argument to the collection. */
if (match) {
msre_var *rvar = apr_pmemdup(mptmp, var, sizeof(msre_var));
rvar->value = str->value;
rvar->value_len = str->value_len;
rvar->name = apr_psprintf(mptmp, "SESSION:%s", log_escape_nq_ex(mptmp, str->name, str->name_len));
apr_table_addn(vartab, rvar->name, (void *)rvar);
count++;
}
}
return count;
}
/* USER */
static int var_user_generate(modsec_rec *msr, msre_var *var, msre_rule *rule,
apr_table_t *vartab, apr_pool_t *mptmp)
{
const apr_array_header_t *arr = NULL;
const apr_table_entry_t *te = NULL;
int i, count = 0;
apr_table_t *target_col = NULL;
target_col = (apr_table_t *)apr_table_get(msr->collections, "user");
if (target_col == NULL) return 0;
arr = apr_table_elts(target_col);
te = (apr_table_entry_t *)arr->elts;
for (i = 0; i < arr->nelts; i++) {
msc_string *str = (msc_string *)te[i].val;
int match;
/* Figure out if we want to include this variable. */
match = 0;
if (var->param == NULL) match = 1; /* Unconditional match. */
else {
if (var->param_data != NULL) { /* Regex. */
char *my_error_msg = NULL;
if (!(msc_regexec((msc_regex_t *)var->param_data, str->name,
str->name_len, &my_error_msg) == PCRE_ERROR_NOMATCH)) match = 1;
} else { /* Simple comparison. */
if (strcasecmp(str->name, var->param) == 0) match = 1;