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#include "first.h"
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "plugin.h"
#include <stdlib.h>
#include <string.h>
typedef struct {
array *access_allow;
array *access_deny;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
INIT_FUNC(mod_access_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
return p;
}
FREE_FUNC(mod_access_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;
array_free(s->access_allow);
array_free(s->access_deny);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
SETDEFAULTS_FUNC(mod_access_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "url.access-deny", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
{ "url.access-allow", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
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->access_deny = array_init();
s->access_allow = array_init();
cv[0].destination = s->access_deny;
cv[1].destination = s->access_allow;
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 (!array_is_vlist(s->access_deny)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"unexpected value for url.access-deny; expected list of \"suffix\"");
return HANDLER_ERROR;
}
if (!array_is_vlist(s->access_allow)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"unexpected value for url.access-allow; expected list of \"suffix\"");
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_access_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(access_allow);
PATCH(access_deny);
/* 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("url.access-deny"))) {
PATCH(access_deny);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.access-allow"))) {
PATCH(access_allow);
}
}
}
return 0;
}
#undef PATCH
static int mod_access_check (const array *allow, const array *deny, const buffer *urlpath, const int lc) {
if (allow->used) {
const buffer *match = (!lc)
? array_match_value_suffix(allow, urlpath)
: array_match_value_suffix_nc(allow, urlpath);
return (match != NULL); /* allowed if match; denied if none matched */
}
if (deny->used) {
const buffer *match = (!lc)
? array_match_value_suffix(deny, urlpath)
: array_match_value_suffix_nc(deny, urlpath);
return (match == NULL); /* deny if match; allow if none matched */
}
return 1; /* allowed (not denied) */
}
/**
* URI handler
*
* we will get called twice:
* - after the clean up of the URL and
* - after the pathinfo checks are done
*
* this handles the issue of trailing slashes
*/
URIHANDLER_FUNC(mod_access_uri_handler) {
plugin_data *p = p_d;
if (buffer_is_empty(con->uri.path)) return HANDLER_GO_ON;
mod_access_patch_connection(srv, con, p);
if (0 == p->conf.access_allow->used && 0 == p->conf.access_deny->used) {
return HANDLER_GO_ON; /* access allowed; nothing to match */
}
if (con->conf.log_request_handling) {
log_error_write(srv, __FILE__, __LINE__, "s",
"-- mod_access_uri_handler called");
}
if (mod_access_check(p->conf.access_allow, p->conf.access_deny,
con->uri.path, con->conf.force_lowercase_filenames)) {
return HANDLER_GO_ON; /* access allowed */
}
/* (else) access denied */
if (con->conf.log_request_handling) {
if (p->conf.access_allow->used) {
log_error_write(srv, __FILE__, __LINE__, "sb", "url denied as failed to match any from access_allow", con->uri.path);
}
else {
log_error_write(srv, __FILE__, __LINE__, "sb", "url denied as we match access_deny", con->uri.path);
}
}
con->http_status = 403;
con->mode = DIRECT;
return HANDLER_FINISHED;
}
int mod_access_plugin_init(plugin *p);
int mod_access_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("access");
p->init = mod_access_init;
p->set_defaults = mod_access_set_defaults;
p->handle_uri_clean = mod_access_uri_handler;
p->handle_subrequest_start = mod_access_uri_handler;
p->cleanup = mod_access_free;
p->data = NULL;
return 0;
}
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