193 lines
6.3 KiB
C
193 lines
6.3 KiB
C
#include "first.h"
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#include "base.h"
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#include "array.h"
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#include "buffer.h"
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#include "log.h"
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#include "plugin.h"
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#include <stdlib.h>
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#include <string.h>
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typedef struct {
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const array *alias;
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} plugin_config;
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typedef struct {
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PLUGIN_DATA;
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plugin_config defaults;
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plugin_config conf;
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} plugin_data;
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INIT_FUNC(mod_alias_init) {
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return calloc(1, sizeof(plugin_data));
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}
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static void mod_alias_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
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switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
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case 0: /* alias.url */
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pconf->alias = cpv->v.a;
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break;
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default:/* should not happen */
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return;
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}
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}
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static void mod_alias_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
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do {
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mod_alias_merge_config_cpv(pconf, cpv);
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} while ((++cpv)->k_id != -1);
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}
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static void mod_alias_patch_config(request_st * const r, plugin_data * const p) {
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p->conf = p->defaults; /* copy small struct instead of memcpy() */
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/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
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for (int i = 1, used = p->nconfig; i < used; ++i) {
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if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
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mod_alias_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
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}
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}
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static int mod_alias_check_order(server * const srv, const array * const a) {
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for (uint32_t j = 0; j < a->used; ++j) {
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const buffer * const prefix = &a->data[j]->key;
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const size_t plen = buffer_string_length(prefix);
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for (uint32_t k = j + 1; k < a->used; ++k) {
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const buffer * const key = &a->data[k]->key;
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if (buffer_string_length(key) < plen) {
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break;
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}
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if (memcmp(key->ptr, prefix->ptr, plen) != 0) {
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break;
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}
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/* ok, they have same prefix. check position */
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const data_unset *dj = a->data[j];
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const data_unset *dk = a->data[k];
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const data_unset **data = (const data_unset **)a->data;
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while (*data != dj && *data != dk) ++data;
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if (*data == dj) {
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log_error(srv->errh, __FILE__, __LINE__,
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"url.alias: `%s' will never match as `%s' matched first",
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key->ptr, prefix->ptr);
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return 0;
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}
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}
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}
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return 1;
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}
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SETDEFAULTS_FUNC(mod_alias_set_defaults) {
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static const config_plugin_keys_t cpk[] = {
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{ CONST_STR_LEN("alias.url"),
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T_CONFIG_ARRAY_KVSTRING,
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T_CONFIG_SCOPE_CONNECTION }
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,{ NULL, 0,
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T_CONFIG_UNSET,
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T_CONFIG_SCOPE_UNSET }
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};
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plugin_data * const p = p_d;
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if (!config_plugin_values_init(srv, p, cpk, "mod_alias"))
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return HANDLER_ERROR;
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/* process and validate config directives
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* (init i to 0 if global context; to 1 to skip empty global context) */
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for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
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const config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
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for (; -1 != cpv->k_id; ++cpv) {
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switch (cpv->k_id) {
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case 0: /* alias.url */
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if (cpv->v.a->used >= 2 && !mod_alias_check_order(srv,cpv->v.a))
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return HANDLER_ERROR;
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break;
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default:/* should not happen */
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break;
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}
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}
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}
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/* initialize p->defaults from global config context */
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if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
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const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
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if (-1 != cpv->k_id)
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mod_alias_merge_config(&p->defaults, cpv);
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}
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return HANDLER_GO_ON;
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}
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static handler_t
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mod_alias_remap (request_st * const r, const array * const aliases)
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{
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/* do not include trailing slash on basedir */
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uint32_t basedir_len = buffer_string_length(&r->physical.basedir);
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if ('/' == r->physical.basedir.ptr[basedir_len-1]) --basedir_len;
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const uint32_t path_len = buffer_string_length(&r->physical.path);
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if (0 == path_len || path_len < basedir_len) return HANDLER_GO_ON;
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const uint32_t uri_len = path_len - basedir_len;
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const char * const uri_ptr = r->physical.path.ptr + basedir_len;
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data_string * const ds = (data_string *)
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(!r->conf.force_lowercase_filenames
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? array_match_key_prefix_klen(aliases, uri_ptr, uri_len)
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: array_match_key_prefix_nc_klen(aliases, uri_ptr, uri_len));
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if (NULL == ds) return HANDLER_GO_ON;
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/* matched */
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const uint32_t alias_len = buffer_string_length(&ds->key);
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const uint32_t vlen = buffer_string_length(&ds->value);
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/* check for path traversal in url-path following alias if key
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* does not end in slash, but replacement value ends in slash */
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if (uri_ptr[alias_len] == '.') {
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const char *s = uri_ptr + alias_len + 1;
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if (*s == '.') ++s;
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if (*s == '/' || *s == '\0') {
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if (0 != alias_len && ds->key.ptr[alias_len-1] != '/'
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&& 0 != vlen && ds->value.ptr[vlen-1] == '/') {
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r->http_status = 403;
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return HANDLER_FINISHED;
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}
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}
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}
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/*(not buffer_append_path_len();
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* alias could be prefix instead of complete path segment,
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* (though resulting r->physical.basedir would not be a dir))*/
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if (vlen != basedir_len + alias_len) {
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const uint32_t nlen = vlen + uri_len - alias_len;
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if (path_len + buffer_string_space(&r->physical.path) < nlen)
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buffer_string_prepare_append(&r->physical.path, nlen - path_len);
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memmove(r->physical.path.ptr + vlen,
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uri_ptr + alias_len, uri_len - alias_len);
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buffer_string_set_length(&r->physical.path, nlen);
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}
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memcpy(r->physical.path.ptr, ds->value.ptr, vlen);
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buffer_copy_string_len(&r->physical.basedir, ds->value.ptr, vlen);
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return HANDLER_GO_ON;
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}
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PHYSICALPATH_FUNC(mod_alias_physical_handler) {
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plugin_data * const p = p_d;
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mod_alias_patch_config(r, p);
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return p->conf.alias ? mod_alias_remap(r, p->conf.alias) : HANDLER_GO_ON;
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}
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int mod_alias_plugin_init(plugin *p);
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int mod_alias_plugin_init(plugin *p) {
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p->version = LIGHTTPD_VERSION_ID;
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p->name = "alias";
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p->init = mod_alias_init;
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p->handle_physical= mod_alias_physical_handler;
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p->set_defaults = mod_alias_set_defaults;
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return 0;
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}
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