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#include "first.h"
#include "request.h"
#include "array.h"
#include "buffer.h"
#include "log.h"
#include "plugin.h"
typedef struct {
const array *access_allow;
const array *access_deny;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
} plugin_data;
INIT_FUNC(mod_access_init) {
return ck_calloc(1, sizeof(plugin_data));
}
static void mod_access_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* url.access-deny */
pconf->access_deny = cpv->v.a;
break;
case 1: /* url.access-allow */
pconf->access_allow = cpv->v.a;
break;
default:/* should not happen */
return;
}
}
static void mod_access_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_access_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_access_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_access_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_access_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("url.access-deny"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("url.access-allow"),
T_CONFIG_ARRAY_VLIST,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_access"))
return HANDLER_ERROR;
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_access_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
__attribute_cold__
static handler_t mod_access_reject (request_st * const r, plugin_data * const p) {
if (r->conf.log_request_handling) {
if (p->conf.access_allow && p->conf.access_allow->used)
log_error(r->conf.errh, __FILE__, __LINE__,
"url denied as failed to match any from access_allow %s",
r->uri.path.ptr);
else
log_error(r->conf.errh, __FILE__, __LINE__,
"url denied as we match access_deny %s",
r->uri.path.ptr);
}
r->http_status = 403;
r->handler_module = NULL;
return HANDLER_FINISHED;
}
__attribute_pure__
static int mod_access_check (const array * const allow, const array * const deny, const buffer * const urlpath, const int lc) {
if (allow && allow->used) {
const buffer * const 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 && deny->used) {
const buffer * const 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) */
}
/**
* handler is 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;
mod_access_patch_config(r, p);
if (NULL == p->conf.access_allow && NULL == p->conf.access_deny)
return HANDLER_GO_ON; /* access allowed; nothing to match */
return mod_access_check(p->conf.access_allow, p->conf.access_deny,
&r->uri.path, r->conf.force_lowercase_filenames)
? HANDLER_GO_ON /* access allowed */
: mod_access_reject(r, p); /* access denied */
}
__attribute_cold__
int mod_access_plugin_init(plugin *p);
int mod_access_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "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;
return 0;
}
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