From: Eric Covener <covener@apache.org>
Date: Tue, 24 Mar 2015 13:01:49 +0000 (+0000)
Subject: Merge r1642484 from trunk:
X-Git-Tag: 2.4.13~330
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79b009c9e67ab212a5ea81338b6408f5a32ffdae;p=thirdparty%2Fapache%2Fhttpd.git

Merge r1642484 from trunk:

Remove some instances where a RewriteBase must be specified

Previously, any time you used a relative substitution in
per-directory/htaccess context, you needed to specify
a RewriteBase. But in case where the context document root
and context prefix are known via e.g. mod_userdir
or mod_alias, and the substitution is under the context
document root, we can determine the replacement automatically.

This makes htaccess files or config snippets a bit more
portable.





git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1668870 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/CHANGES b/CHANGES
index 3a0a4b8a603..3c0a569ce84 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,10 @@ Changes with Apache 2.4.13
      calls r:wsupgrade() can cause a child process crash. 
      [Edward Lu <Chaosed0 gmail.com>]
 
+  *) mod_rewrite: Improve relative substitutions in per-directory/htaccess
+     context for directories found by mod_userdir and mod_alias.  These no
+     longer require RewriteBase to be specified. [Eric Covener]
+
   *) mod_lua: After a r:wsupgrade(), mod_lua was not properly
      responding to a websockets PING but instead invoking the specified 
      script. PR57524. [Edward Lu <Chaosed0 gmail.com>]
diff --git a/STATUS b/STATUS
index a2159263922..08c268508e6 100644
--- a/STATUS
+++ b/STATUS
@@ -106,12 +106,6 @@ RELEASE SHOWSTOPPERS:
 PATCHES ACCEPTED TO BACKPORT FROM TRUNK:
   [ start all new proposals below, under PATCHES PROPOSED. ]
 
-   * mod_rewrite: use the context info API to alleviate the need to specify
-                  a RewriteBase in some situations
-     trunk patch: http://svn.apache.org/r1642484
-     2.4.x patch: trunk works
-     +1 covener, jim, ylavic
-
   *) SECURITY: CVE-2015-0253 (cve.mitre.org)
      core: Fix a crash introduced in with ErrorDocument 400 pointing
      to a local URL-path with the INCLUDES filter active, introduced
diff --git a/modules/mappers/mod_rewrite.c b/modules/mappers/mod_rewrite.c
index de0c11ba540..a879f6a0c91 100644
--- a/modules/mappers/mod_rewrite.c
+++ b/modules/mappers/mod_rewrite.c
@@ -195,6 +195,7 @@ static const char* really_last_key = "rewrite_really_last";
 #define OPTION_INHERIT_DOWN         1<<6
 #define OPTION_INHERIT_DOWN_BEFORE  1<<7
 #define OPTION_IGNORE_INHERIT       1<<8
+#define OPTION_IGNORE_CONTEXT_INFO  1<<9
 
 #ifndef RAND_MAX
 #define RAND_MAX 32767
@@ -909,7 +910,7 @@ static int prefix_stat(const char *path, apr_pool_t *pool)
 /*
  * substitute the prefix path 'match' in 'input' with 'subst' (RewriteBase)
  */
-static char *subst_prefix_path(request_rec *r, char *input, char *match,
+static char *subst_prefix_path(request_rec *r, char *input, const char *match,
                                const char *subst)
 {
     apr_size_t len = strlen(match);
@@ -2948,6 +2949,9 @@ static const char *cmd_rewriteoptions(cmd_parms *cmd,
         else if (!strcasecmp(w, "mergebase")) {
             options |= OPTION_MERGEBASE;
         }
+        else if (!strcasecmp(w, "ignorecontextinfo")) {
+            options |= OPTION_IGNORE_CONTEXT_INFO;
+        }
         else {
             return apr_pstrcat(cmd->pool, "RewriteOptions: unknown option '",
                                w, "'", NULL);
@@ -4974,6 +4978,7 @@ static int hook_fixup(request_rec *r)
             return n;
         }
         else {
+            const char *tmpfilename = NULL;
             /* it was finally rewritten to a local path */
 
             /* if someone used the PASSTHROUGH flag in per-dir
@@ -5005,6 +5010,8 @@ static int hook_fixup(request_rec *r)
                 return OK;
             }
 
+            tmpfilename = r->filename;
+
             /* if there is a valid base-URL then substitute
              * the per-dir prefix with this base-URL if the
              * current filename still is inside this per-dir
@@ -5042,6 +5049,27 @@ static int hook_fixup(request_rec *r)
                 }
             }
 
+            /* No base URL, or r->filename wasn't still under dconf->directory
+             * or, r->filename wasn't still under the document root. 
+             * If there's a context document root AND a context prefix, and 
+             * the context document root is a prefix of r->filename, replace.
+             * This allows a relative substitution on a path found by mod_userdir 
+             * or mod_alias without baking in a RewriteBase.
+             */
+            if (tmpfilename == r->filename && 
+                !(dconf->options & OPTION_IGNORE_CONTEXT_INFO)) { 
+                if ((ccp = ap_context_document_root(r)) != NULL) { 
+                    const char *prefix = ap_context_prefix(r);
+                    if (prefix != NULL) { 
+                        rewritelog((r, 2, dconf->directory, "trying to replace "
+                                    "context docroot %s with context prefix %s",
+                                    ccp, prefix));
+                        r->filename = subst_prefix_path(r, r->filename,
+                                ccp, prefix);
+                    }
+                }
+            }
+
             /* now initiate the internal redirect */
             rewritelog((r, 1, dconf->directory, "internal redirect with %s "
                         "[INTERNAL REDIRECT]", r->filename));