Index: httpd-2.4.23/server/protocol.c
===================================================================
--- httpd-2.4.23.orig/server/protocol.c	2017-06-27 12:42:23.112719021 +0200
+++ httpd-2.4.23/server/protocol.c	2017-06-27 12:42:23.148719624 +0200
@@ -1605,6 +1605,7 @@ AP_DECLARE(int) ap_get_basic_auth_pw(req
 
     t = ap_pbase64decode(r->pool, auth_line);
     r->user = ap_getword_nulls (r->pool, &t, ':');
+    apr_table_setn(r->notes, AP_GET_BASIC_AUTH_PW_NOTE, "1");
     r->ap_auth_type = "Basic";
 
     *pw = t;
@@ -1612,6 +1613,53 @@ AP_DECLARE(int) ap_get_basic_auth_pw(req
     return OK;
 }
 
+AP_DECLARE(apr_status_t) ap_get_basic_auth_components(const request_rec *r,
+                                                      const char **username,
+                                                      const char **password)
+{
+    const char *auth_header;
+    const char *credentials;
+    const char *decoded;
+    const char *user;
+
+    auth_header = (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authorization"
+                                                  : "Authorization";
+    credentials = apr_table_get(r->headers_in, auth_header);
+
+    if (!credentials) {
+        /* No auth header. */
+        return APR_EINVAL;
+    }
+
+    if (strcasecmp(ap_getword(r->pool, &credentials, ' '), "Basic")) {
+        /* These aren't Basic credentials. */
+        return APR_EINVAL;
+    }
+
+    while (*credentials == ' ' || *credentials == '\t') {
+        credentials++;
+    }
+
+    /* XXX Our base64 decoding functions don't actually error out if the string
+     * we give it isn't base64; they'll just silently stop and hand us whatever
+     * they've parsed up to that point.
+     *
+     * Since this function is supposed to be a drop-in replacement for the
+     * deprecated ap_get_basic_auth_pw(), don't fix this for 2.4.x.
+     */
+    decoded = ap_pbase64decode(r->pool, credentials);
+    user = ap_getword_nulls(r->pool, &decoded, ':');
+
+    if (username) {
+        *username = user;
+    }
+    if (password) {
+        *password = decoded;
+    }
+
+    return APR_SUCCESS;
+}
+
 struct content_length_ctx {
     int data_sent;  /* true if the C-L filter has already sent at
                      * least one bucket on to the next output filter
Index: httpd-2.4.23/server/request.c
===================================================================
--- httpd-2.4.23.orig/server/request.c	2017-06-27 12:42:23.064718217 +0200
+++ httpd-2.4.23/server/request.c	2017-06-27 12:42:23.148719624 +0200
@@ -262,6 +262,14 @@ AP_DECLARE(int) ap_process_request_inter
         r->ap_auth_type = r->main->ap_auth_type;
     }
     else {
+        /* A module using a confusing API (ap_get_basic_auth_pw) caused
+        ** r->user to be filled out prior to check_authn hook. We treat
+        ** it is inadvertent.
+        */
+        if (r->user && apr_table_get(r->notes, AP_GET_BASIC_AUTH_PW_NOTE)) { 
+            r->user = NULL;
+        }
+
         switch (ap_satisfies(r)) {
         case SATISFY_ALL:
         case SATISFY_NOSPEC:
--- 2.4.x/include/http_protocol.h	2017/05/30 12:26:05	1796854
+++ 2.4.x/include/http_protocol.h	2017/05/30 12:27:41	1796855
@@ -558,7 +558,11 @@
 AP_DECLARE_HOOK(int, note_auth_failure, (request_rec *r, const char *auth_type))
 
 /**
- * Get the password from the request headers
+ * Get the password from the request headers. This function has multiple side
+ * effects due to its prior use in the old authentication framework.
+ * ap_get_basic_auth_components() should be preferred.
+ *
+ * @deprecated @see ap_get_basic_auth_components
  * @param r The current request
  * @param pw The password as set in the headers
  * @return 0 (OK) if it set the 'pw' argument (and assured
@@ -571,6 +575,25 @@
  */
 AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw);
 
+#define AP_GET_BASIC_AUTH_PW_NOTE "AP_GET_BASIC_AUTH_PW_NOTE"
+
+/**
+ * Get the username and/or password from the request's Basic authentication
+ * headers. Unlike ap_get_basic_auth_pw(), calling this function has no side
+ * effects on the passed request_rec.
+ *
+ * @param r The current request
+ * @param username If not NULL, set to the username sent by the client
+ * @param password If not NULL, set to the password sent by the client
+ * @return APR_SUCCESS if the credentials were successfully parsed and returned;
+ *         APR_EINVAL if there was no authentication header sent or if the
+ *         client was not using the Basic authentication scheme. username and
+ *         password are unchanged on failure.
+ */
+AP_DECLARE(apr_status_t) ap_get_basic_auth_components(const request_rec *r,
+                                                      const char **username,
+                                                      const char **password);
+
 /**
  * parse_uri: break apart the uri
  * @warning Side Effects:

