/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); 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 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * mod_dir.c: handle default index files, and trailing-/ redirects */ #include "apr_strings.h" #include "ap_config.h" #include "httpd.h" #include "http_config.h" #include "http_core.h" #include "http_request.h" #include "http_protocol.h" #include "http_log.h" #include "http_main.h" #include "util_script.h" module AP_MODULE_DECLARE_DATA dir_module; typedef enum { SLASH_OFF = 0, SLASH_ON, SLASH_UNSET } slash_cfg; typedef struct dir_config_struct { apr_array_header_t *index_names; slash_cfg do_slash; } dir_config_rec; #define DIR_CMD_PERMS OR_INDEXES static const char *add_index(cmd_parms *cmd, void *dummy, const char *arg) { dir_config_rec *d = dummy; if (!d->index_names) { d->index_names = apr_array_make(cmd->pool, 2, sizeof(char *)); } *(const char **)apr_array_push(d->index_names) = arg; return NULL; } static const char *configure_slash(cmd_parms *cmd, void *d_, int arg) { dir_config_rec *d = d_; d->do_slash = arg ? SLASH_ON : SLASH_OFF; return NULL; } static const command_rec dir_cmds[] = { AP_INIT_ITERATE("DirectoryIndex", add_index, NULL, DIR_CMD_PERMS, "a list of file names"), AP_INIT_FLAG("DirectorySlash", configure_slash, NULL, DIR_CMD_PERMS, "On or Off"), {NULL} }; static void *create_dir_config(apr_pool_t *p, char *dummy) { dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec)); new->index_names = NULL; new->do_slash = SLASH_UNSET; return (void *) new; } static void *merge_dir_configs(apr_pool_t *p, void *basev, void *addv) { dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec)); dir_config_rec *base = (dir_config_rec *)basev; dir_config_rec *add = (dir_config_rec *)addv; new->index_names = add->index_names ? add->index_names : base->index_names; new->do_slash = (add->do_slash == SLASH_UNSET) ? base->do_slash : add->do_slash; return new; } static int fixup_dir(request_rec *r) { dir_config_rec *d; char *dummy_ptr[1]; char **names_ptr; int num_names; int error_notfound = 0; /* only handle requests against directories */ if (r->finfo.filetype != APR_DIR) { return DECLINED; } /* In case mod_mime wasn't present, and no handler was assigned. */ if (!r->handler) { r->handler = DIR_MAGIC_TYPE; } /* Never tolerate path_info on dir requests */ if (r->path_info && *r->path_info) { return DECLINED; } d = (dir_config_rec *)ap_get_module_config(r->per_dir_config, &dir_module); /* Redirect requests that are not '/' terminated */ if (r->uri[0] == '\0' || r->uri[strlen(r->uri) - 1] != '/') { char *ifile; if (!d->do_slash) { return DECLINED; } /* Only redirect non-get requests if we have no note to warn * that this browser cannot handle redirs on non-GET requests * (such as Microsoft's WebFolders). */ if ((r->method_number != M_GET) && apr_table_get(r->subprocess_env, "redirect-carefully")) { return DECLINED; } if (r->args != NULL) { ifile = apr_pstrcat(r->pool, ap_escape_uri(r->pool, r->uri), "/", "?", r->args, NULL); } else { ifile = apr_pstrcat(r->pool, ap_escape_uri(r->pool, r->uri), "/", NULL); } apr_table_setn(r->headers_out, "Location", ap_construct_url(r->pool, ifile, r)); return HTTP_MOVED_PERMANENTLY; } if (strcmp(r->handler, DIR_MAGIC_TYPE)) { return DECLINED; } if (d->index_names) { names_ptr = (char **)d->index_names->elts; num_names = d->index_names->nelts; } else { dummy_ptr[0] = AP_DEFAULT_INDEX; names_ptr = dummy_ptr; num_names = 1; } for (; num_names; ++names_ptr, --num_names) { /* XXX: Is this name_ptr considered escaped yet, or not??? */ char *name_ptr = *names_ptr; request_rec *rr; /* Once upon a time args were handled _after_ the successful redirect. * But that redirect might then _refuse_ the given r->args, creating * a nasty tangle. It seems safer to consider the r->args while we * determine if name_ptr is our viable index, and therefore set them * up correctly on redirect. */ if (r->args != NULL) { name_ptr = apr_pstrcat(r->pool, name_ptr, "?", r->args, NULL); } rr = ap_sub_req_lookup_uri(name_ptr, r, NULL); /* The sub request lookup is very liberal, and the core map_to_storage * handler will almost always result in HTTP_OK as /foo/index.html * may be /foo with PATH_INFO="/index.html", or even / with * PATH_INFO="/foo/index.html". To get around this we insist that the * the index be a regular filetype. * * Another reason is that the core handler also makes the assumption * that if r->finfo is still NULL by the time it gets called, the * file does not exist. */ if (rr->status == HTTP_OK && ( (rr->handler && !strcmp(rr->handler, "proxy-server")) || rr->finfo.filetype == APR_REG)) { ap_internal_fast_redirect(rr, r); return OK; } /* If the request returned a redirect, propagate it to the client */ if (ap_is_HTTP_REDIRECT(rr->status) || (rr->status == HTTP_NOT_ACCEPTABLE && num_names == 1) || (rr->status == HTTP_UNAUTHORIZED && num_names == 1)) { apr_pool_join(r->pool, rr->pool); error_notfound = rr->status; r->notes = apr_table_overlay(r->pool, r->notes, rr->notes); r->headers_out = apr_table_overlay(r->pool, r->headers_out, rr->headers_out); r->err_headers_out = apr_table_overlay(r->pool, r->err_headers_out, rr->err_headers_out); return error_notfound; } /* If the request returned something other than 404 (or 200), * it means the module encountered some sort of problem. To be * secure, we should return the error, rather than allow autoindex * to create a (possibly unsafe) directory index. * * So we store the error, and if none of the listed files * exist, we return the last error response we got, instead * of a directory listing. */ if (rr->status && rr->status != HTTP_NOT_FOUND && rr->status != HTTP_OK) { error_notfound = rr->status; } ap_destroy_sub_req(rr); } if (error_notfound) { return error_notfound; } /* nothing for us to do, pass on through */ return DECLINED; } static void register_hooks(apr_pool_t *p) { ap_hook_fixups(fixup_dir,NULL,NULL,APR_HOOK_LAST); } module AP_MODULE_DECLARE_DATA dir_module = { STANDARD20_MODULE_STUFF, create_dir_config, /* create per-directory config structure */ merge_dir_configs, /* merge per-directory config structures */ NULL, /* create per-server config structure */ NULL, /* merge per-server config structures */ dir_cmds, /* command apr_table_t */ register_hooks /* register hooks */ };
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