/
re.c
3420 lines (2872 loc) · 117 KB
/
re.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 security@modsecurity.org.
*/
#include <ctype.h>
#include "re.h"
#if defined(WITH_LUA)
#include "msc_lua.h"
#endif
static const char *const severities[] = {
"EMERGENCY",
"ALERT",
"CRITICAL",
"ERROR",
"WARNING",
"NOTICE",
"INFO",
"DEBUG",
NULL,
};
static int fetch_target_exception(msre_rule *rule, modsec_rec *msr, msre_var *var, const char *exceptions);
static apr_status_t msre_parse_targets(msre_ruleset *ruleset, const char *text,
apr_array_header_t *arr, char **error_msg);
static char *msre_generate_target_string(apr_pool_t *pool, msre_rule *rule);
static msre_var *msre_create_var(msre_ruleset *ruleset, const char *name, const char *param,
modsec_rec *msr, char **error_msg);
static msre_action *msre_create_action(msre_engine *engine, apr_pool_t *mp, const char *name,
const char *param, char **error_msg);
static apr_status_t msre_rule_process(msre_rule *rule, modsec_rec *msr);
/* -- Actions, variables, functions and operator functions ----------------- */
/**
* \brief Remove rule targets to be processed
*
* \param rule Pointer to the rule
* \param msr ModSecurity transaction resource
* \param var Pointer to target structure.
* \param targets Exception list.
*/
static int fetch_target_exception(msre_rule *rule, modsec_rec *msr, msre_var *var, const char *exceptions) {
const char *targets = NULL;
char *savedptr = NULL, *target = NULL;
char *c = NULL, *name = NULL, *value = NULL;
char *variable = NULL, *myvar = NULL;
char *myvalue = NULL, *myname = NULL;
int match = 0;
if(msr == NULL)
return 0;
if(var == NULL)
return 0;
if(rule == NULL)
return 0;
if(rule->actionset == NULL)
return 0;
if(rule->actionset->id !=NULL) {
myvar = apr_pstrdup(msr->mp, var->name);
c = strchr(myvar,':');
if(c != NULL) {
myname = apr_strtok(myvar,":",&myvalue);
} else {
myname = myvar;
}
match = 0;
targets = apr_pstrdup(msr->mp, exceptions);
if(targets != NULL) {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "fetch_target_exception: Found exception target list [%s] for rule id %s", targets, rule->actionset->id);
}
target = apr_strtok((char *)targets, ",", &savedptr);
while(target != NULL) {
variable = apr_pstrdup(msr->mp, target);
c = strchr(variable,':');
if(c != NULL) {
name = apr_strtok(variable,":",&value);
} else {
name = variable;
value = NULL;
}
if((strlen(myname) == strlen(name)) &&
(strncasecmp(myname, name,strlen(myname)) == 0)) {
if(value != NULL && myvalue != NULL) {
if((strlen(myvalue) == strlen(value)) &&
strncasecmp(myvalue,value,strlen(myvalue)) == 0) {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "fetch_target_exception: Target %s will not be processed.", target);
}
match = 1;
}
} else if (value == NULL && myvalue == NULL) {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "fetch_target_exception: Target %s will not be processed.", target);
}
match = 1;
} else if (value == NULL && myvalue != NULL) {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "fetch_target_exception: Target %s will not be processed.", target);
}
match = 1;
}
}
target = apr_strtok(NULL, ",", &savedptr);
}
} else {
if (msr->txcfg->debuglog_level >= 9) {
msr_log(msr, 9, "fetch_target_exception: No exception target found for rule id %s.", rule->actionset->id);
}
}
}
if(match == 1)
return 1;
return 0;
}
/**
* \brief Update target for all matching rules in set, in any phase
*
* \param msr ModSecurity transaction resource
* \param ruleset Pointer to set of rules to modify
* \param re Pointer to exception object describing which rules to modify
* \param p2 Pointer to configuration option TARGET
* \param p3 Pointer to configuration option REPLACED_TARGET
*/
char *msre_ruleset_rule_update_target_matching_exception(modsec_rec *msr, msre_ruleset *ruleset, rule_exception *re, const char *p2, const char *p3) {
char *err;
if(ruleset == NULL)
return NULL;
if(p2 == NULL) {
return apr_psprintf(ruleset->mp, "Trying to update without a target");
}
if (NULL != (err = msre_ruleset_phase_rule_update_target_matching_exception(msr, ruleset, re, ruleset->phase_request_headers, p2, p3)))
return err;
if (NULL != (err = msre_ruleset_phase_rule_update_target_matching_exception(msr, ruleset, re, ruleset->phase_request_body, p2, p3)))
return err;
if (NULL != (err = msre_ruleset_phase_rule_update_target_matching_exception(msr, ruleset, re, ruleset->phase_response_headers, p2, p3)))
return err;
if (NULL != (err = msre_ruleset_phase_rule_update_target_matching_exception(msr, ruleset, re, ruleset->phase_response_body, p2, p3)))
return err;
if (NULL != (err = msre_ruleset_phase_rule_update_target_matching_exception(msr, ruleset, re, ruleset->phase_logging, p2, p3)))
return err;
/* Everything worked! */
return NULL;
}
/**
* \brief Update target for all matching rules in set for a specific phase
*
* \param msr ModSecurity transaction resource
* \param ruleset Pointer to set of rules to modify
* \param re Pointer to exception object describing which rules to modify
* \param phase_arr Pointer to phase that should be edited
* \param p2 Pointer to configuration option TARGET
* \param p3 Pointer to configuration option REPLACED_TARGET
*
* \todo Figure out error checking
*/
char *msre_ruleset_phase_rule_update_target_matching_exception(modsec_rec *msr, msre_ruleset *ruleset, rule_exception *re,
apr_array_header_t *phase_arr, const char *p2,
const char *p3)
{
msre_rule **rules;
int i, j, mode;
char *err;
j = 0;
mode = 0;
rules = (msre_rule **)phase_arr->elts;
for (i = 0; i < phase_arr->nelts; i++) {
msre_rule *rule = (msre_rule *)rules[i];
if (mode == 0) { /* Looking for next rule. */
if (msre_ruleset_rule_matches_exception(rule, re)) {
err = update_rule_target_ex(NULL, ruleset, rule, p2, p3);
if (err) return err;
if (rule->actionset->is_chained) mode = 2; /* Match all rules in this chain. */
} else {
if (rule->actionset->is_chained) mode = 1; /* Skip all rules in this chain. */
}
} else { /* Handling rule that is part of a chain. */
if (mode == 2) { /* We want to change the rule. */
err = update_rule_target_ex(msr, ruleset, rule, p2, p3);
if (err) return err;
}
if ((rule->actionset == NULL)||(rule->actionset->is_chained == 0)) mode = 0;
}
}
return NULL;
}
char *update_rule_target_ex(modsec_rec *msr, msre_ruleset *ruleset, msre_rule *rule, const char *p2,
const char *p3) {
msre_var **targets = NULL;
const char *current_targets = NULL;
char *my_error_msg = NULL, *target = NULL;
char *p = NULL, *savedptr = NULL;
unsigned int is_negated = 0, is_counting = 0;
int name_len = 0, value_len = 0;
char *name = NULL, *value = NULL;
char *opt = NULL, *param = NULL;
char *target_list = NULL, *replace = NULL;
int i, rc, match = 0, var_appended = 0;
if(rule != NULL) {
target_list = strdup(p2);
if(target_list == NULL)
return apr_psprintf(ruleset->mp, "Error to update target - memory allocation");;
if(p3 != NULL) {
replace = strdup(p3);
if(replace == NULL) {
free(target_list);
target_list = NULL;
return apr_psprintf(ruleset->mp, "Error to update target - memory allocation");;
}
}
if(replace != NULL) {
opt = strchr(replace,'!');
if(opt != NULL) {
*opt = '\0';
opt++;
param = opt;
is_negated = 1;
} else if ((opt = strchr(replace,'&')) != NULL) {
*opt = '\0';
opt++;
param = opt;
is_counting = 1;
} else {
param = replace;
}
opt = strchr(param,':');
if(opt != NULL) {
name = apr_strtok(param,":",&value);
} else {
name = param;
}
if(apr_table_get(ruleset->engine->variables, name) == NULL) {
if(target_list != NULL)
free(target_list);
if(replace != NULL)
free(replace);
if(msr) {
msr_log(msr, 9, "Error to update target - [%s] is not valid target", name);
}
return apr_psprintf(ruleset->mp, "Error to update target - [%s] is not valid target", name);
}
name_len = strlen(name);
if(value != NULL)
value_len = strlen(value);
if(msr) {
msr_log(msr, 9, "Trying to replace by variable name [%s] value [%s]", name, value);
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, " ModSecurity: Trying to replace by variable name [%s] value [%s]", name, value);
}
#endif
targets = (msre_var **)rule->targets->elts;
// TODO need a good way to remove the element from array, maybe change array by tables or rings
for (i = 0; i < rule->targets->nelts; i++) {
if((strlen(targets[i]->name) == strlen(name)) &&
(strncasecmp(targets[i]->name,name,strlen(targets[i]->name)) == 0) &&
(targets[i]->is_negated == is_negated) &&
(targets[i]->is_counting == is_counting)) {
if(value != NULL && targets[i]->param != NULL) {
if((strlen(targets[i]->param) == strlen(value)) &&
strncasecmp(targets[i]->param,value,strlen(targets[i]->param)) == 0) {
memset(targets[i]->name,0,strlen(targets[i]->name));
memset(targets[i]->param,0,strlen(targets[i]->param));
targets[i]->is_counting = 0;
targets[i]->is_negated = 1;
match = 1;
}
} else if (value == NULL && targets[i]->param == NULL){
memset(targets[i]->name,0,strlen(targets[i]->name));
targets[i]->is_counting = 0;
targets[i]->is_negated = 1;
match = 1;
} else
continue;
}
}
}
p = apr_strtok(target_list, ",", &savedptr);
while(p != NULL) {
if(replace != NULL) {
if(match == 1) {
rc = msre_parse_targets(ruleset, p, rule->targets, &my_error_msg);
if (rc < 0) {
if(msr) {
msr_log(msr, 9, "Error parsing rule targets to replace variable");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, " ModSecurity: Error parsing rule targets to replace variable");
}
#endif
goto end;
}
if(msr) {
msr_log(msr, 9, "Successfully replaced variable");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, " ModSecurity: Successfully replaced variable");
}
#endif
var_appended = 1;
} else {
if(msr) {
msr_log(msr, 9, "Cannot find variable to replace");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, " ModSecurity: Cannot find varibale to replace");
}
#endif
goto end;
}
} else {
target = strdup(p);
if(target == NULL)
return NULL;
is_negated = is_counting = 0;
param = name = value = NULL;
opt = strchr(target,'!');
if(opt != NULL) {
*opt = '\0';
opt++;
param = opt;
is_negated = 1;
} else if ((opt = strchr(target,'&')) != NULL) {
*opt = '\0';
opt++;
param = opt;
is_counting = 1;
} else {
param = apr_pstrdup(msr->mp, target);
}
opt = strchr(param,':');
if(opt != NULL) {
name = apr_strtok(param,":",&value);
} else {
name = param;
}
if(apr_table_get(ruleset->engine->variables, name) == NULL) {
if(target_list != NULL)
free(target_list);
if (target != NULL)
free(target);
if(replace != NULL)
free(replace);
if(msr) {
msr_log(msr, 9, "Error to update target - [%s] is not valid target", name);
}
return apr_psprintf(ruleset->mp, "Error to update target - [%s] is not valid target", name);
}
name_len = strlen(name);
if(value != NULL)
value_len = strlen(value);
if(msr) {
msr_log(msr, 9, "Trying to append variable name [%s] value [%s]", name, value);
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, " ModSecurity: Trying to append variable name [%s] value [%s]", name, value);
}
#endif
match = 0;
targets = (msre_var **)rule->targets->elts;
for (i = 0; i < rule->targets->nelts; i++) {
if((strlen(targets[i]->name) == strlen(name)) &&
(strncasecmp(targets[i]->name,name,strlen(targets[i]->name)) == 0) &&
(targets[i]->is_negated == is_negated) &&
(targets[i]->is_counting == is_counting)) {
if(value != NULL && targets[i]->param != NULL) {
if((strlen(targets[i]->param) == strlen(value)) &&
strncasecmp(targets[i]->param,value,strlen(targets[i]->param)) == 0) {
match = 1;
}
} else if (value == NULL && targets[i]->param == NULL){
match = 1;
} else
continue;
}
}
if(target != NULL) {
free(target);
target = NULL;
}
if(match == 0 ) {
rc = msre_parse_targets(ruleset, p, rule->targets, &my_error_msg);
if (rc < 0) {
if(msr) {
msr_log(msr, 9, "Error parsing rule targets to append variable");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, " ModSecurity: Error parsing rule targets to append variable");
}
#endif
goto end;
}
var_appended = 1;
} else {
if(msr) {
msr_log(msr, 9, "Skipping variable, already appended");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, " ModSecurity: Skipping variable, already appended");
}
#endif
}
}
p = apr_strtok(NULL,",",&savedptr);
}
if(var_appended == 1) {
current_targets = msre_generate_target_string(ruleset->mp, rule);
rule->unparsed = msre_rule_generate_unparsed(ruleset->mp, rule, current_targets, NULL, NULL);
rule->p1 = apr_pstrdup(ruleset->mp, current_targets);
if(msr) {
msr_log(msr, 9, "Successfully appended variable");
}
#if !defined(MSC_TEST)
else {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, " ModSecurity: Successfully appended variable");
}
#endif
}
}
end:
if(target_list != NULL) {
free(target_list);
target_list = NULL;
}
if(replace != NULL) {
free(replace);
replace = NULL;
}
if(target != NULL) {
free(target);
target = NULL;
}
return NULL;
}
int msre_ruleset_rule_matches_exception(msre_rule *rule, rule_exception *re) {
int match = 0;
/* Only remove non-placeholder rules */
if (rule->placeholder == RULE_PH_NONE) {
switch(re->type) {
case RULE_EXCEPTION_REMOVE_ID :
if ((rule->actionset != NULL)&&(rule->actionset->id != NULL)) {
int ruleid = atoi(rule->actionset->id);
if (rule_id_in_range(ruleid, re->param)) {
match = 1;
}
}
break;
case RULE_EXCEPTION_REMOVE_MSG :
if ((rule->actionset != NULL)&&(rule->actionset->msg != NULL)) {
char *my_error_msg = NULL;
int rc = msc_regexec(re->param_data,
rule->actionset->msg, strlen(rule->actionset->msg),
&my_error_msg);
if (rc >= 0) {
match = 1;
}
}
break;
case RULE_EXCEPTION_REMOVE_TAG :
if ((rule->actionset != NULL)&&(apr_is_empty_table(rule->actionset->actions) == 0)) {
char *my_error_msg = NULL;
const apr_array_header_t *tarr = NULL;
const apr_table_entry_t *telts = NULL;
int act;
tarr = apr_table_elts(rule->actionset->actions);
telts = (const apr_table_entry_t*)tarr->elts;
for (act = 0; act < tarr->nelts; act++) {
msre_action *action = (msre_action *)telts[act].val;
if((action != NULL) && (action->metadata != NULL) && (strcmp("tag", action->metadata->name) == 0)) {
int rc = msc_regexec(re->param_data,
action->param, strlen(action->param),
&my_error_msg);
if (rc >= 0) {
match = 1;
}
}
}
}
break;
}
}
return match;
}
/**
* Remove actions with the same cardinality group from the actionset.
*/
static void msre_actionset_cardinality_fixup(msre_actionset *actionset, msre_action *action) {
const apr_array_header_t *tarr = NULL;
const apr_table_entry_t *telts = NULL;
int i;
if ((actionset == NULL) || (action == NULL)) return;
tarr = apr_table_elts(actionset->actions);
telts = (const apr_table_entry_t*)tarr->elts;
for (i = 0; i < tarr->nelts; i++) {
msre_action *target = (msre_action *)telts[i].val;
if (target->metadata->cardinality_group == action->metadata->cardinality_group) {
apr_table_unset(actionset->actions, target->metadata->name);
}
}
}
static char *msre_generate_target_string(apr_pool_t *pool, msre_rule *rule) {
char *target_str = NULL;
msre_var **targets = NULL;
int i = 0;
targets = (msre_var **)rule->targets->elts;
for (i = 0; i < rule->targets->nelts; i++) {
if(targets[i]->name != NULL && strlen(targets[i]->name) > 0) {
target_str = apr_pstrcat(pool,
(target_str == NULL) ? "" : apr_psprintf(pool, "%s|", target_str),
(targets[i]->is_negated == 0) ? "" : "!",
(targets[i]->is_counting == 0) ? "" : "&",
(targets[i]->name == NULL) ? "" : targets[i]->name,
(targets[i]->param == NULL) ? "" : apr_psprintf(pool, ":%s", targets[i]->param),
NULL);
}
}
return target_str;
}
/**
* Generate an action string from an actionset.
*/
static char *msre_actionset_generate_action_string(apr_pool_t *pool, const msre_actionset *actionset) {
const apr_array_header_t *tarr = NULL;
const apr_table_entry_t *telts = NULL;
char *actions = NULL;
int chain;
int i;
if (actionset == NULL) return NULL;
chain = ((actionset->rule != NOT_SET_P) && actionset->rule->chain_starter) ? 1 : 0;
tarr = apr_table_elts(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;
int use_quotes = 0;
if (chain) {
/* Skip some actions that are not used in a chain. */
if ( (action->metadata->type == ACTION_DISRUPTIVE)
|| (action->metadata->type == ACTION_METADATA)
|| (strcmp("log", action->metadata->name) == 0)
|| (strcmp("auditlog", action->metadata->name) == 0)
|| (strcmp("nolog", action->metadata->name) == 0)
|| (strcmp("noauditlog", action->metadata->name) == 0)
|| (strcmp("severity", action->metadata->name) == 0)
|| (strcmp("ver", action->metadata->name) == 0)
|| (strcmp("maturity", action->metadata->name) == 0)
|| (strcmp("accuracy", action->metadata->name) == 0)
|| (strcmp("tag", action->metadata->name) == 0)
|| (strcmp("phase", action->metadata->name) == 0))
{
continue;
}
}
/* Check if we need any quotes */
if (action->param != NULL) {
int j;
for(j = 0; action->param[j] != '\0'; j++) {
if (isspace(action->param[j])) {
use_quotes = 1;
break;
}
}
if (j == 0) use_quotes = 1;
}
actions = apr_pstrcat(pool,
(actions == NULL) ? "" : actions,
(actions == NULL) ? "" : ",",
action->metadata->name,
(action->param == NULL) ? "" : ":",
(use_quotes) ? "'" : "",
(action->param == NULL) ? "" : action->param,
(use_quotes) ? "'" : "",
NULL);
}
return actions;
}
/**
* Add an action to an actionset.
*/
static void msre_actionset_action_add(msre_actionset *actionset, msre_action *action)
{
msre_action *add_action = action;
if ((actionset == NULL)) return;
/**
* The "block" action is just a placeholder for the parent action.
*/
if ((actionset->parent_intercept_action_rec != NULL) && (actionset->parent_intercept_action_rec != NOT_SET_P) && (strcmp("block", action->metadata->name) == 0) && (strcmp("block", action->metadata->name) == 0)) {
/* revert back to parent */
actionset->intercept_action = actionset->parent_intercept_action;
add_action = actionset->parent_intercept_action_rec;
}
if ((add_action == NULL)) return;
if (add_action->metadata->cardinality_group != ACTION_CGROUP_NONE) {
msre_actionset_cardinality_fixup(actionset, add_action);
}
if (add_action->metadata->cardinality == ACTION_CARDINALITY_ONE) {
/* One action per actionlist. */
apr_table_setn(actionset->actions, add_action->metadata->name, (void *)add_action);
} else {
/* Multiple actions per actionlist. */
apr_table_addn(actionset->actions, add_action->metadata->name, (void *)add_action);
}
}
/**
* Creates msre_var instances (rule variables) out of the
* given text string and places them into the supplied table.
*/
static apr_status_t msre_parse_targets(msre_ruleset *ruleset, const char *text,
apr_array_header_t *arr, char **error_msg)
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
apr_table_t *vartable;
unsigned int count = 0;
apr_status_t rc;
msre_var *var;
int i;
if (text == NULL) return -1;
/* Extract name & value pairs first */
vartable = apr_table_make(ruleset->mp, 10);
if (vartable == NULL) return -1;
rc = msre_parse_generic(ruleset->mp, text, vartable, error_msg);
if (rc < 0) return rc;
/* Loop through the table and create variables */
tarr = apr_table_elts(vartable);
telts = (const apr_table_entry_t*)tarr->elts;
for (i = 0; i < tarr->nelts; i++) {
var = msre_create_var(ruleset, telts[i].key, telts[i].val, NULL, error_msg);
if (var == NULL) return -1;
*(msre_var **)apr_array_push(arr) = var;
count++;
}
return count;
}
/**
* Creates msre_action instances by parsing the given string, placing
* them into the supplied array.
*/
static apr_status_t msre_parse_actions(msre_engine *engine, apr_pool_t *mp, msre_actionset *actionset,
const char *text, char **error_msg)
{
const apr_array_header_t *tarr;
const apr_table_entry_t *telts;
apr_table_t *vartable;
unsigned int count = 0;
apr_status_t rc;
msre_action *action;
int i;
if (error_msg == NULL) {
return -1;
}
*error_msg = NULL;
if (text == NULL) {
*error_msg = apr_psprintf(mp, "Internal error: " \
"msre_parse_actions, variable text is NULL");
return -1;
}
/* Extract name & value pairs first */
vartable = apr_table_make(mp, 10);
if (vartable == NULL) {
*error_msg = apr_psprintf(mp, "Internal error: " \
"msre_parse_actions, failed to create vartable");
return -1;
}
rc = msre_parse_generic(mp, text, vartable, error_msg);
if (rc < 0) {
if (*error_msg == NULL)
*error_msg = apr_psprintf(mp, "Internal error: " \
"msre_parse_actions, msre_parse_generic failed. Return " \
"code: %d", rc);
return rc;
}
/* Loop through the table and create actions */
tarr = apr_table_elts(vartable);
telts = (const apr_table_entry_t*)tarr->elts;
for (i = 0; i < tarr->nelts; i++) {
/* Create action. */
action = msre_create_action(engine, mp, telts[i].key, telts[i].val, error_msg);
if (action == NULL) {
if (*error_msg == NULL)
*error_msg = apr_psprintf(mp, "Internal error: " \
"msre_parse_actions, msre_create_action failed.");
return -1;
}
/* Initialise action (option). */
if (action->metadata->init != NULL) {
action->metadata->init(engine, mp, actionset, action);
}
msre_actionset_action_add(actionset, action);
count++;
}
return count;
}
/**
* Locates variable metadata given the variable name.
*/
msre_var_metadata *msre_resolve_var(msre_engine *engine, const char *name)
{
return (msre_var_metadata *)apr_table_get(engine->variables, name);
}
/**
* Locates action metadata given the action name.
*/
static msre_action_metadata *msre_resolve_action(msre_engine *engine, const char *name)
{
return (msre_action_metadata *)apr_table_get(engine->actions, name);
}
/**
* Creates a new variable instance given the variable name
* and an (optional) parameter.
*/
msre_var *msre_create_var_ex(apr_pool_t *pool, msre_engine *engine, const char *name, const char *param,
modsec_rec *msr, char **error_msg)
{
const char *varparam = param;
msre_var *var = apr_pcalloc(pool, sizeof(msre_var));
if (var == NULL) return NULL;
if (error_msg == NULL) return NULL;
*error_msg = NULL;
/* Handle negation and member counting */
if (name[0] == '!') {
var->is_negated = 1;
var->name = (char *)name + 1;
}
else
if (name[0] == '&') {
var->is_counting = 1;
var->name = (char *)name + 1;
}
else {
var->name = (char *)name;
}
/* Treat HTTP_* targets as an alias for REQUEST_HEADERS:* */
if ( (var->name != NULL)
&& (strlen(var->name) > 5)
&& (strncmp("HTTP_", var->name, 5) == 0))
{
const char *oldname = var->name;
var->name = apr_pstrdup(pool, "REQUEST_HEADERS");
varparam = apr_pstrdup(pool, oldname + 5);
}
/* Resolve variable */
var->metadata = msre_resolve_var(engine, var->name);
if (var->metadata == NULL) {
*error_msg = apr_psprintf(pool, "Unknown variable: %s", name);
return NULL;
}
/* The counting operator "&" can only be used against collections. */
if (var->is_counting) {
if (var->metadata->type == VAR_SIMPLE) {
*error_msg = apr_psprintf(pool, "The & modificator does not apply to "
"non-collection variables.");
return NULL;
}
}
/* Check the parameter. */
if (varparam == NULL) {
if (var->metadata->argc_min > 0) {
*error_msg = apr_psprintf(pool, "Missing mandatory parameter for variable %s.",
name);
return NULL;
}
} else { /* Parameter present */
/* Do we allow a parameter? */
if (var->metadata->argc_max == 0) {
*error_msg = apr_psprintf(pool, "Variable %s does not support parameters.",
name);
return NULL;
}
var->param = (char *)varparam;
}
return var;
}
/**
* Create a new variable object from the provided name and value.
*
* NOTE: this allocates out of the global pool and should not be used
* per-request
*/
static msre_var *msre_create_var(msre_ruleset *ruleset, const char *name, const char *param,
modsec_rec *msr, char **error_msg)
{
msre_var *var = msre_create_var_ex(ruleset->mp, ruleset->engine, name, param, msr, error_msg);
if (var == NULL) return NULL;
/* Validate & initialise variable */
if (var->metadata->validate != NULL) {
*error_msg = var->metadata->validate(ruleset, var);
if (*error_msg != NULL) {
return NULL;
}
}
return var;
}
/**
* Creates a new action instance given its name and an (optional) parameter.
*/
msre_action *msre_create_action(msre_engine *engine, apr_pool_t *mp, const char *name, const char *param,
char **error_msg)
{
msre_action *action = NULL;
if (error_msg == NULL) {
return NULL;
}
*error_msg = NULL;
action = apr_pcalloc(mp, sizeof(msre_action));
if (action == NULL) {
*error_msg = apr_psprintf(mp, "Internal error: " \
"msre_create_action, not able to allocate action");
return NULL;
}
/* Resolve action */
action->metadata = msre_resolve_action(engine, name);
if (action->metadata == NULL) {
*error_msg = apr_psprintf(mp, "Unknown action: %s", name);
return NULL;
}
if (param == NULL) { /* Parameter not present */
if (action->metadata->argc_min > 0) {
*error_msg = apr_psprintf(mp, "Missing mandatory parameter for action %s",
name);
return NULL;
}
} else { /* Parameter present */
/* Should we allow the parameter? */
if (action->metadata->argc_max == 0) {
*error_msg = apr_psprintf(mp, "Extra parameter provided to action %s", name);
return NULL;