lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "rand.h"
#include "plugin.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "md5.h"
/* plugin config for all request/connections */
typedef struct {
buffer *cookie_name;
buffer *cookie_domain;
unsigned int cookie_max_age;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_usertrack_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_usertrack_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
buffer_free(s->cookie_name);
buffer_free(s->cookie_domain);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_usertrack_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "usertrack.cookie-name", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "usertrack.cookie-max-age", NULL, T_CONFIG_INT, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ "usertrack.cookie-domain", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->cookie_name = buffer_init();
s->cookie_domain = buffer_init();
s->cookie_max_age = 0;
cv[0].destination = s->cookie_name;
cv[1].destination = &(s->cookie_max_age);
cv[2].destination = s->cookie_domain;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
if (buffer_string_is_empty(s->cookie_name)) {
buffer_copy_string_len(s->cookie_name, CONST_STR_LEN("TRACKID"));
} else {
size_t j, len = buffer_string_length(s->cookie_name);
for (j = 0; j < len; j++) {
char c = s->cookie_name->ptr[j] | 32;
if (c < 'a' || c > 'z') {
log_error_write(srv, __FILE__, __LINE__, "sb",
"invalid character in usertrack.cookie-name:",
s->cookie_name);
return HANDLER_ERROR;
}
}
}
if (!buffer_string_is_empty(s->cookie_domain)) {
size_t j, len = buffer_string_length(s->cookie_domain);
for (j = 0; j < len; j++) {
char c = s->cookie_domain->ptr[j];
if (c <= 32 || c >= 127 || c == '"' || c == '\\') {
log_error_write(srv, __FILE__, __LINE__, "sb",
"invalid character in usertrack.cookie-domain:",
s->cookie_domain);
return HANDLER_ERROR;
}
}
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_usertrack_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(cookie_name);
PATCH(cookie_domain);
PATCH(cookie_max_age);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("usertrack.cookie-name"))) {
PATCH(cookie_name);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("usertrack.cookie-max-age"))) {
PATCH(cookie_max_age);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("usertrack.cookie-domain"))) {
PATCH(cookie_domain);
}
}
}
return 0;
}
#undef PATCH
URIHANDLER_FUNC(mod_usertrack_uri_handler) {
plugin_data *p = p_d;
data_string *ds;
unsigned char h[16];
li_MD5_CTX Md5Ctx;
char hh[LI_ITOSTRING_LENGTH];
if (buffer_is_empty(con->uri.path)) return HANDLER_GO_ON;
mod_usertrack_patch_connection(srv, con, p);
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, "Cookie"))) {
char *g;
/* we have a cookie, does it contain a valid name ? */
/* parse the cookie
*
* check for cookiename + (WS | '=')
*
*/
if (NULL != (g = strstr(ds->value->ptr, p->conf.cookie_name->ptr))) {
char *nc;
/* skip WS */
for (nc = g + buffer_string_length(p->conf.cookie_name); *nc == ' ' || *nc == '\t'; nc++);
if (*nc == '=') {
/* ok, found the key of our own cookie */
if (strlen(nc) > 32) {
/* i'm lazy */
return HANDLER_GO_ON;
}
}
}
}
/* set a cookie */
if (NULL == (ds = (data_string *)array_get_unused_element(con->response.headers, TYPE_STRING))) {
ds = data_response_init();
}
buffer_copy_string_len(ds->key, CONST_STR_LEN("Set-Cookie"));
buffer_copy_buffer(ds->value, p->conf.cookie_name);
buffer_append_string_len(ds->value, CONST_STR_LEN("="));
/* taken from mod_auth.c */
/* generate shared-secret */
li_MD5_Init(&Md5Ctx);
li_MD5_Update(&Md5Ctx, CONST_BUF_LEN(con->uri.path));
li_MD5_Update(&Md5Ctx, CONST_STR_LEN("+"));
/* we assume sizeof(time_t) == 4 here, but if not it ain't a problem at all */
li_itostrn(hh, sizeof(hh), srv->cur_ts);
li_MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
li_MD5_Update(&Md5Ctx, (unsigned char *)srv->entropy, sizeof(srv->entropy));
li_itostrn(hh, sizeof(hh), li_rand_pseudo_bytes());
li_MD5_Update(&Md5Ctx, (unsigned char *)hh, strlen(hh));
li_MD5_Final(h, &Md5Ctx);
buffer_append_string_encoded(ds->value, (char *)h, 16, ENCODING_HEX);
buffer_append_string_len(ds->value, CONST_STR_LEN("; Path=/"));
buffer_append_string_len(ds->value, CONST_STR_LEN("; Version=1"));
if (!buffer_string_is_empty(p->conf.cookie_domain)) {
buffer_append_string_len(ds->value, CONST_STR_LEN("; Domain="));
buffer_append_string_encoded(ds->value, CONST_BUF_LEN(p->conf.cookie_domain), ENCODING_REL_URI);
}
if (p->conf.cookie_max_age) {
buffer_append_string_len(ds->value, CONST_STR_LEN("; max-age="));
buffer_append_int(ds->value, p->conf.cookie_max_age);
}
array_insert_unique(con->response.headers, (data_unset *)ds);
return HANDLER_GO_ON;
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_usertrack_plugin_init(plugin *p);
int mod_usertrack_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("usertrack");
p->init = mod_usertrack_init;
p->handle_uri_clean = mod_usertrack_uri_handler;
p->set_defaults = mod_usertrack_set_defaults;
p->cleanup = mod_usertrack_free;
p->data = NULL;
return 0;
}