I want to know if is possible to change spacing of a normal (not raster) legend in Geoserver:
I need to add more space between the squares and the text.
dx,dy,mx,my parameters but they only work for Raster Layers
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Mauro Bartolomeoli is proposing new vendor options to control margin around labels just this week: http://osgeo-org.1560.x6.nabble.com/WMS-GetLegendGraphic-td5293025.html
So, I would expect to find this functionality in a release in the next few months (if I had to guess, maybe 2.9.4 in January 2017, maybe 2.10.1 in December 2016)
The Geoserver manual is a good spot to check out more information.
You could use the GetLegendGraphic to change the normal legend graphics.
The GetLegendGraphic operation itself is optional for an SLD-enabled WMS. It provides a general mechanism for acquiring legend symbols, beyond the LegendURL reference of WMS Capabilities. Servers supporting the GetLegendGraphic call might code LegendURL references as GetLegendGraphic for interface consistency. Vendor-specific parameters may be added to GetLegendGraphic requests and all of the usual OGC-interface options and rules apply. No XML-POST method for GetLegendGraphic is presently defined.
These two parameters can be specified for Vector graphics, as in your case.
WIDTH Optional This gives a hint for the width of the returned graphic in pixels. Vector-graphics can use this value as a hint for the level of detail to include.
HEIGHT Optional This gives a hint for the height of the returned graphic in pixels.
GeoServer allows finer control over the legend appearance via the vendor parameter LEGEND_OPTIONS. The general format of LEGEND_OPTIONS is the same as FORMAT_OPTIONS,
You could get more details from the Geoserver manual