ModSecurity/standalone/filters.c at v2/exp/ModSecurity_for_Java · CodingWord/ModSecurity · GitHub

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* ModSecurity for Apache 2.x, http://www.modsecurity.org/

* 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 <limits.h>

#include "http_core.h"

#include "http_request.h"

#include "modsecurity.h"

#include "apache2.h"

#include "http_main.h"

#include "http_connection.h"

#include "apr_optional.h"

#include "mod_log_config.h"

#include "msc_logging.h"

#include "msc_util.h"

#include "ap_mpm.h"

#include "scoreboard.h"

#include "apr_version.h"

#include "apr_lib.h"

#include "ap_config.h"

#include "http_config.h"

#define FILTER_POOL apr_hook_global_pool

#include "apr_hooks.h"

** This macro returns true/false if a given filter should be inserted BEFORE

** another filter. This will happen when one of: 1) there isn't another

** filter; 2) that filter has a higher filter type (class); 3) that filter

** corresponds to a different request.

#define INSERT_BEFORE(f, before_this) ((before_this) == NULL \

|| (before_this)->frec->ftype > (f)->frec->ftype \

|| (before_this)->r != (f)->r)

apr_table_t *ms_input_filters = NULL;

apr_table_t *ms_output_filters = NULL;

void init_filter_tables()

{

if(ms_input_filters == NULL)

{

ms_input_filters = apr_table_make(FILTER_POOL, 10);

ms_output_filters = apr_table_make(FILTER_POOL, 10);

}

AP_DECLARE(ap_filter_rec_t *) ap_register_input_filter(const char *name,

ap_in_filter_func filter_func,

ap_init_filter_func filter_init,

ap_filter_type ftype)

{

ap_filter_rec_t *f;

init_filter_tables();

f = apr_palloc(FILTER_POOL, sizeof(ap_filter_rec_t));

f->filter_func.in_func = filter_func;

f->filter_init_func = filter_init;

f->ftype = ftype;

f->name = name;

apr_table_setn(ms_input_filters, name, (const char *)f);

return f;

}

AP_DECLARE(ap_filter_rec_t *) ap_register_output_filter(const char *name,

ap_out_filter_func filter_func,

ap_init_filter_func filter_init,

ap_filter_type ftype)

{

ap_filter_rec_t *f;

init_filter_tables();

f = apr_palloc(FILTER_POOL, sizeof(ap_filter_rec_t));

f->filter_func.out_func = filter_func;

f->filter_init_func = filter_init;

f->ftype = ftype;

f->name = name;

apr_table_setn(ms_output_filters, name, (const char *)f);

return f;

}

static ap_filter_t *add_any_filter_handle(ap_filter_rec_t *frec, void *ctx,

request_rec *r, conn_rec *c,

ap_filter_t **r_filters,

ap_filter_t **p_filters,

ap_filter_t **c_filters)

{

apr_pool_t* p = r ? r->pool : c->pool;

ap_filter_t *f = apr_palloc(p, sizeof(*f));

ap_filter_t **outf;

if (frec->ftype < AP_FTYPE_PROTOCOL) {

if (r) {

outf = r_filters;

}

else {

ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,

"a content filter was added without a request: %s", frec->name);

return NULL;

}

else if (frec->ftype < AP_FTYPE_CONNECTION) {

if (r) {

outf = p_filters;

}

else {

ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL,

"a protocol filter was added without a request: %s", frec->name);

return NULL;

}

else {

outf = c_filters;

}

f->frec = frec;

f->ctx = ctx;

f->r = r;

f->c = c;

f->next = NULL;

if (INSERT_BEFORE(f, *outf)) {

f->next = *outf;

if (*outf) {

ap_filter_t *first = NULL;

if (r) {

/* If we are adding our first non-connection filter,

* Then don't try to find the right location, it is

* automatically first.

if (*r_filters != *c_filters) {

first = *r_filters;

while (first && (first->next != (*outf))) {

first = first->next;

}

if (first && first != (*outf)) {

first->next = f;

}

*outf = f;

}

else {

ap_filter_t *fscan = *outf;

while (!INSERT_BEFORE(f, fscan->next))

fscan = fscan->next;

f->next = fscan->next;

fscan->next = f;

}

if (frec->ftype < AP_FTYPE_CONNECTION && (*r_filters == *c_filters)) {

*r_filters = *p_filters;

}

return f;

}

AP_DECLARE(ap_filter_t *) ap_add_input_filter(const char *name, void *ctx,

request_rec *r, conn_rec *c)

{

ap_filter_rec_t *f = (ap_filter_rec_t *)apr_table_get(ms_input_filters, name);

if(f == NULL)

return NULL;

return add_any_filter_handle(f, ctx, r, c,

r ? &r->input_filters : NULL,

r ? &r->proto_input_filters : NULL, &c->input_filters);

}

AP_DECLARE(ap_filter_t *) ap_add_output_filter(const char *name, void *ctx,

request_rec *r, conn_rec *c)

{

ap_filter_rec_t *f = (ap_filter_rec_t *)apr_table_get(ms_output_filters, name);

if(f == NULL)

return NULL;

return add_any_filter_handle(f, ctx, r, c,

r ? &r->output_filters : NULL,

r ? &r->proto_output_filters : NULL, &c->output_filters);

}

static void remove_any_filter(ap_filter_t *f, ap_filter_t **r_filt, ap_filter_t **p_filt,

ap_filter_t **c_filt)

{

ap_filter_t **curr = r_filt ? r_filt : c_filt;

ap_filter_t *fscan = *curr;

if (p_filt && *p_filt == f)

*p_filt = (*p_filt)->next;

if (*curr == f) {

*curr = (*curr)->next;

return;

}

while (fscan->next != f) {

if (!(fscan = fscan->next)) {

return;

}

fscan->next = f->next;

}

AP_DECLARE(void) ap_remove_input_filter(ap_filter_t *f)

{

remove_any_filter(f, f->r ? &f->r->input_filters : NULL,

f->r ? &f->r->proto_input_filters : NULL,

&f->c->input_filters);

}

AP_DECLARE(void) ap_remove_output_filter(ap_filter_t *f)

{

remove_any_filter(f, f->r ? &f->r->output_filters : NULL,

f->r ? &f->r->proto_output_filters : NULL,

&f->c->output_filters);

}

ModSecurity/standalone/filters.c at v2/exp/ModSecurity_for_Java · CodingWord/ModSecurity · GitHub

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