Avoid mixed content when cgiurl is https but url is not

diff --git a/IkiWiki.pm b/IkiWiki.pm
index c1518a2ae058a1682d883f628a9f7fb8fae2c97f..38b91ae1d373e4c6f38f99a8b4ccb61aed33fcc0 100644 (file)
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -613,7 +613,26 @@ sub checkconfig () {
 
                        $local_cgiurl = $cgiurl->path;
 
-                       if ($cgiurl->scheme ne $baseurl->scheme) {
+                       if ($cgiurl->scheme eq 'https' &&
+                               $baseurl->scheme eq 'http') {
+                               # We assume that the same content is available
+                               # over both http and https, because if it
+                               # wasn't, accessing the static content
+                               # from the CGI would be mixed-content,
+                               # which would be a security flaw.
+
+                               if ($cgiurl->authority ne $baseurl->authority) {
+                                       # use protocol-relative URL for
+                                       # static content
+                                       $local_url = "$config{url}/";
+                                       $local_url =~ s{^http://}{//};
+                               }
+                               # else use host-relative URL for static content
+
+                               # either way, CGI needs to be absolute
+                               $local_cgiurl = $config{cgiurl};
+                       }
+                       elsif ($cgiurl->scheme ne $baseurl->scheme) {
                                # too far apart, fall back to absolute URLs
                                $local_url = "$config{url}/";
                                $local_cgiurl = $config{cgiurl};
@@ -626,6 +645,7 @@ sub checkconfig () {
                                $local_cgiurl = $config{cgiurl};
                                $local_cgiurl =~ s{^https?://}{//};
                        }
+                       # else keep host-relative URLs
                }
 
                $local_url =~ s{//$}{/};

diff --git a/t/relativity.t b/t/relativity.t
index 6c4d1107e2c7bd11ac417b2b51f679a21a6d264c..675efc903e58626ac94d017333af8aa9d9ba86b2 100755 (executable)
--- a/t/relativity.t
+++ b/t/relativity.t
@@ -407,12 +407,9 @@ run(["./t/tmp/ikiwiki.cgi"], \undef, \$content, init => sub {
        $ENV{HTTPS} = 'on';
 });
 %bits = parse_cgi_content($content);
-TODO: {
-local $TODO = "avoid mixed content";
 is($bits{basehref}, "https://example.com/wiki/");
 like($bits{stylehref}, qr{^(?:(?:https:)?//example.com)?/wiki/style.css$});
 like($bits{tophref}, qr{^(?:/wiki|\.)/$});
-}
 like($bits{cgihref}, qr{^(?:(?:https:)?//example.com)?/cgi-bin/ikiwiki.cgi$});
 
 # when not accessed via HTTPS, ???
@@ -439,11 +436,13 @@ run(["./t/tmp/ikiwiki.cgi"], \undef, \$content, init => sub {
        $ENV{HTTPS} = 'on';
 });
 %bits = parse_cgi_content($content);
+# because the static and dynamic stuff is on the same server, we assume that
+# both are also on the staging server
+like($bits{basehref}, qr{^https://staging.example.net/wiki/$});
+like($bits{stylehref}, qr{^(?:(?:https:)?//staging.example.net)?/wiki/style.css$});
+like($bits{tophref}, qr{^(?:(?:(?:https:)?//staging.example.net)?/wiki|\.)/$});
 TODO: {
-local $TODO = "avoid mixed content";
-like($bits{basehref}, qr{^https://example.com/wiki/$});
-like($bits{stylehref}, qr{^(?:(?:https:)?//example.com)?/wiki/style.css$});
-like($bits{tophref}, qr{^(?:(?:(?:https:)?//example.com)?/wiki|\.)/$});
+local $TODO = "this should really point back to itself but currently points to example.com";
 like($bits{cgihref}, qr{^(?:(?:https:)?//staging.example.net)?/cgi-bin/ikiwiki.cgi$});
 }
 
@@ -458,11 +457,8 @@ run(["./t/tmp/ikiwiki.cgi"], \$in, \$content, init => sub {
        $ENV{HTTPS} = 'on';
 });
 %bits = parse_cgi_content($content);
-TODO: {
-local $TODO = "avoid mixed content";
 is($bits{basehref}, "https://example.com/wiki/a/b/c/");
 like($bits{stylehref}, qr{^(?:(?:https:)?//example.com)?/wiki/style.css$});
-}
 like($bits{tophref}, qr{^(?:/wiki|\.\./\.\./\.\.)/$});
 like($bits{cgihref}, qr{^(?:(?:https:)?//example.com)?/cgi-bin/ikiwiki.cgi$});
 

diff --git a/t/urlto.t b/t/urlto.t
index 025409b7fffe9c69cdd5542547793baaf8e64081..50cad88ddfbfcb3a6f803784226e5405a0206d74 100755 (executable)
--- a/t/urlto.t
+++ b/t/urlto.t
@@ -50,11 +50,13 @@ is(IkiWiki::baseurl(undef), "//example.co.uk/~smcv/");
 is(IkiWiki::urlto('stoats', undef), "//example.co.uk/~smcv/stoats/");
 is(IkiWiki::urlto('', undef), "//example.co.uk/~smcv/");
 
-# with url and cgiurl on different schemes, "local" degrades to absolute
+# with url and cgiurl on different schemes, "local" degrades to absolute for
+# CGI but protocol-relative for static content, to avoid the CGI having
+# mixed content
 $IkiWiki::config{url} = "http://example.co.uk/~smcv";
 $IkiWiki::config{cgiurl} = "https://dynamic.example.co.uk/~smcv/ikiwiki.cgi";
 is(IkiWiki::checkconfig(), 1);
 is(IkiWiki::cgiurl(), "https://dynamic.example.co.uk/~smcv/ikiwiki.cgi");
-is(IkiWiki::baseurl(undef), "http://example.co.uk/~smcv/");
-is(IkiWiki::urlto('stoats', undef), "http://example.co.uk/~smcv/stoats/");
-is(IkiWiki::urlto('', undef), "http://example.co.uk/~smcv/");
+is(IkiWiki::baseurl(undef), "//example.co.uk/~smcv/");
+is(IkiWiki::urlto('stoats', undef), "//example.co.uk/~smcv/stoats/");
+is(IkiWiki::urlto('', undef), "//example.co.uk/~smcv/");