[mapserver-users] CGI variable "map" fails to validate.

[Jeff McKenna]

Hi David,

MS4W also uses PCRE for its regex engine, so Windows users will soon be 
facing these same issues as you (I'll be making this as easy as possible 
for the new Windows users).

So to answer your question: I believe most users aren't yet aware of 
what regex engine they use, and, also I believe that the PCRE regex 
engine is used more frequently in the MapServer community than what is 
believed.  (most automated tests do not use PCRE, for example, even 
though it is so commonly used)

I'm not sure if I have the answer that you need, but I wanted to give a 
perspective from the Windows side.

-jeff


-- 
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/



On 2021-06-03 9:29 a.m., David Pavlíček via mapserver-users wrote:
> Hi Steve,
> your pattern works like a charm... escaped hyphen was the issue. I 
> tested the previous regex with regex101.com <http://regex101.com> and it 
> matches with no problems against most of the available variants except 
> PCRE. Which regex engine is suitable for a test against MapServer?
> 
> Thank you.
> 
> st 2. 6. 2021 v 15:16 odesílatel Steve Lime <sdlime at gmail.com 
> <mailto:sdlime at gmail.com>> napsal:
> 
>     Hi David: Presumably the Docker image is running the most recent
>     version of 7.4 which would have that pull request applied. That
>     said, I don't think it's the culprit here and I have seen some
>     issues with -'s where the MS_MAP_PATTERN expression compiles fine
>     but doesn't match as expected. Re-writing the expression to move the
>     - character can help. Try this:
> 
>       
>     MS_MAP_PATTERN=^\/etc\/mapserver\/([^\.][-_A-Za-z0-9\.]+\/{1})*([-_A-Za-z0-9\.]+\.map)$
> 
>     --Steve
> 
>     On Wed, Jun 2, 2021 at 3:07 AM David Pavlíček via mapserver-users
>     <mapserver-users at lists.osgeo.org
>     <mailto:mapserver-users at lists.osgeo.org>> wrote:
> 
>         Hello,
>         I'm using camptocamp/mapserver:7.4 docker image to run mapserver
>         on our servers and I have recently encountered this error:
> 
>         [warn] [pid 25] mod_fcgid: stderr: msCGILoadMap(): Web
>         application error. CGI variable "map" fails to validate.
>         2098 - 172.17.0.1 - - [02/Jun/2021:04:57:42 +0000] "GET
>         /?map=/etc/mapserver/puobod/krpk-puobod-red.map&request=getcapabilities&service=WMS"
> 
>         In fact, any mapfile with hyphens won't work. They fail against
>         MS_MAP_PATTERN regex or something. This is strange because I
>         tested this regex and it works fine. Container MS ENV variables
>         look like this:
> 
>         MS_ERRORFILE=stderr
>         MS_MAP_PATTERN=^\/etc\/mapserver\/([^\.][_A-Za-z0-9\-\.]+\/{1})*([_A-Za-z0-9\-\.]+\.map)$
>         MS_DEBUGLEVEL=0
>         MS_MAPFILE=/etc/mapserver/mapserver.map
> 
>         Maybe something related to this PR:
>         https://github.com/MapServer/MapServer/pull/6314
>         <https://github.com/MapServer/MapServer/pull/6314>
> 
>         Any suggestions about that? Renaming project is not an option
>         because they are referenced in many places outside of our direct
>         reach (GIS clients, servers, etc)
> 
>         Thanks, David