From 9bc1917a27a2323e535aadb081e38172ae0e3fc2 Mon Sep 17 00:00:00 2001
From: Stefan Eissing <icing@apache.org>
Date: Mon, 18 Mar 2019 08:49:59 +0000
Subject: [PATCH] Merge of r1855705 from trunk:
core: merge consecutive slashes in the path
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1855737 13f79535-47bb-0310-9956-ffa450edef68
include/http_core.h | 2 +-
include/httpd.h | 14 ++++++++++++--
server/core.c | 13 +++++++++++++
server/request.c | 25 +++++++++----------------
server/util.c | 10 +++++++---
5 files changed, 43 insertions(+), 21 deletions(-)
@@ -740,7 +740,7 @@ typedef struct {
#define AP_HTTP_METHODS_LENIENT 1
#define AP_HTTP_METHODS_REGISTERED 2
char http_methods;
-
+ unsigned int merge_slashes;
} core_server_config;
/* for AddOutputFiltersByType in core.c */
@@ -1697,11 +1697,21 @@ AP_DECLARE(int) ap_unescape_url_keep2f(char *url, int decode_slashes);
AP_DECLARE(int) ap_unescape_urlencoded(char *query);
/**
- * Convert all double slashes to single slashes
- * @param name The string to convert
+ * Convert all double slashes to single slashes, except where significant
+ * to the filesystem on the current platform.
+ * @param name The string to convert, assumed to be a filesystem path
*/
AP_DECLARE(void) ap_no2slash(char *name);
+/**
+ * Convert all double slashes to single slashes, except where significant
+ * to the filesystem on the current platform.
+ * @param name The string to convert
+ * @param is_fs_path if set to 0, the significance of any double-slashes is
+ * ignored.
+ */
+AP_DECLARE(void) ap_no2slash_ex(char *name, int is_fs_path);
+
/**
* Remove all ./ and xx/../ substrings from a file name. Also remove
* any leading ../ or /../ substrings.
@@ -490,6 +490,7 @@ static void *create_core_server_config(apr_pool_t *a, server_rec *s)
conf->protocols = apr_array_make(a, 5, sizeof(const char *));
conf->protocols_honor_order = -1;
+ conf->merge_slashes = AP_CORE_CONFIG_UNSET;
return (void *)conf;
}
@@ -555,6 +556,7 @@ static void *merge_core_server_configs(apr_pool_t *p, void *basev, void *virtv)
conf->protocols_honor_order = ((virt->protocols_honor_order < 0)?
base->protocols_honor_order :
virt->protocols_honor_order);
+ AP_CORE_MERGE_FLAG(merge_slashes, conf, base, virt);
return conf;
}
@@ -1863,6 +1865,13 @@ static const char *set_qualify_redirect_url(cmd_parms *cmd, void *d_, int flag)
return NULL;
}
+static const char *set_core_server_flag(cmd_parms *cmd, void *s_, int flag)
+{
+ core_server_config *conf =
+ ap_get_core_module_config(cmd->server->module_config);
+ return ap_set_flag_slot(cmd, conf, flag);
+}
+
static const char *set_override_list(cmd_parms *cmd, void *d_, int argc, char *const argv[])
{
core_dir_config *d = d_;
@@ -4562,6 +4571,10 @@ AP_INIT_ITERATE("HttpProtocolOptions", set_http_protocol_options, NULL, RSRC_CON
"'Unsafe' or 'Strict' (default). Sets HTTP acceptance rules"),
AP_INIT_ITERATE("RegisterHttpMethod", set_http_method, NULL, RSRC_CONF,
"Registers non-standard HTTP methods"),
+AP_INIT_FLAG("MergeSlashes", set_core_server_flag,
+ (void *)APR_OFFSETOF(core_server_config, merge_slashes),
+ RSRC_CONF,
+ "Controls whether consecutive slashes in the URI path are merged"),
{ NULL }
};
@@ -167,6 +167,8 @@ AP_DECLARE(int) ap_process_request_internal(request_rec *r)
int file_req = (r->main && r->filename);
int access_status;
core_dir_config *d;
+ core_server_config *sconf =
+ ap_get_core_module_config(r->server->module_config);
/* Ignore embedded %2F's in path for proxy requests */
if (!r->proxyreq && r->parsed_uri.path) {
@@ -191,6 +193,10 @@ AP_DECLARE(int) ap_process_request_internal(request_rec *r)
}
ap_getparents(r->uri); /* OK --- shrinking transformations... */
+ if (sconf->merge_slashes != AP_CORE_CONFIG_OFF) {
+ ap_no2slash(r->uri);
+ ap_no2slash(r->parsed_uri.path);
+ }
/* All file subrequests are a huge pain... they cannot bubble through the
* next several steps. Only file subrequests are allowed an empty uri,
@@ -1411,20 +1417,7 @@ AP_DECLARE(int) ap_location_walk(request_rec *r)
cache = prep_walk_cache(AP_NOTE_LOCATION_WALK, r);
cached = (cache->cached != NULL);
-
- /* Location and LocationMatch differ on their behaviour w.r.t. multiple
- * slashes. Location matches multiple slashes with a single slash,
- * LocationMatch doesn't. An exception, for backwards brokenness is
- * absoluteURIs... in which case neither match multiple slashes.
- */
- if (r->uri[0] != '/') {
- entry_uri = r->uri;
- }
- else {
- char *uri = apr_pstrdup(r->pool, r->uri);
- ap_no2slash(uri);
- entry_uri = uri;
- }
+ entry_uri = r->uri;
/* If we have an cache->cached location that matches r->uri,
* and the vhost's list of locations hasn't changed, we can skip
@@ -1491,7 +1484,7 @@ AP_DECLARE(int) ap_location_walk(request_rec *r)
pmatch = apr_palloc(rxpool, nmatch*sizeof(ap_regmatch_t));
}
- if (ap_regexec(entry_core->r, r->uri, nmatch, pmatch, 0)) {
+ if (ap_regexec(entry_core->r, entry_uri, nmatch, pmatch, 0)) {
continue;
}
@@ -1501,7 +1494,7 @@ AP_DECLARE(int) ap_location_walk(request_rec *r)
apr_table_setn(r->subprocess_env,
((const char **)entry_core->refs->elts)[i],
apr_pstrndup(r->pool,
- r->uri + pmatch[i].rm_so,
+ entry_uri + pmatch[i].rm_so,
pmatch[i].rm_eo - pmatch[i].rm_so));
}
}
@@ -561,16 +561,16 @@ AP_DECLARE(void) ap_getparents(char *name)
name[l] = '\0';
}
}
-
-AP_DECLARE(void) ap_no2slash(char *name)
+AP_DECLARE(void) ap_no2slash_ex(char *name, int is_fs_path)
{
+
char *d, *s;
s = d = name;
#ifdef HAVE_UNC_PATHS
/* Check for UNC names. Leave leading two slashes. */
- if (s[0] == '/' && s[1] == '/')
+ if (is_fs_path && s[0] == '/' && s[1] == '/')
*d++ = *s++;
#endif
@@ -587,6 +587,10 @@ AP_DECLARE(void) ap_no2slash(char *name)
*d = '\0';
}
+AP_DECLARE(void) ap_no2slash(char *name)
+{
+ ap_no2slash_ex(name, 1);
+}
/*
* copy at most n leading directories of s into d