I've seen some examples where the dashboard shows a numeric pin pad -- once you enter the correct code, it redirects you to other dashboard "pages". It's definitely a low-tech way to provide some basic "security", but it sounds like it would work for your situation.
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font-weight: normal; font-size: 150px; font-family: Arial;\">#</text>\n </g>\n</svg>\n</md-button>","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":390,"y":500,"wires":[["49d71834.096548"]]},{"id":"f99d83cc.b54df","type":"ui_text","z":"c54ebe65.60eaa","group":"d4851ecc.b4b53","order":13,"width":0,"height":0,"name":"keys pressed","label":"Number:","format":"{{msg.payload}}","layout":"row-spread","x":610,"y":380,"wires":[]},{"id":"49d71834.096548","type":"function","z":"c54ebe65.60eaa","name":"code entry","func":"var key = msg.payload;\nvar out = context.get(\"code\") || \"\";\n\nif (key === \"#\") {\n key = \"\"; // send code\n}\nelse if (key === \"*\") {\n key = \"\"; // reset code\n out = \"\";\n}\nelse if (!isNaN(+key)) {\n out += key; // append key\n}\ncontext.set(\"code\", key ? out : undefined);\n\n// output #1: keys entered\n// output #2: completed code\nmsg.payload = out;\nreturn [\n key ? msg : {payload: \"\"},\n out ? msg : null\n];","outputs":2,"noerr":0,"x":570,"y":440,"wires":[["f99d83cc.b54df"],["abbb2a40.b43368"]],"outputLabels":["last key number","completed code"]},{"id":"abbb2a40.b43368","type":"debug","z":"c54ebe65.60eaa","name":"code entered","active":true,"tosidebar":false,"console":false,"tostatus":true,"complete":"payload","x":610,"y":500,"wires":[]},{"id":"d4851ecc.b4b53","type":"ui_group","z":"","name":"Keypad","tab":"f71dee08.232e9","order":5,"disp":true,"width":"6"},{"id":"f71dee08.232e9","type":"ui_tab","z":"","name":"Button Panel","icon":"dashboard"}]
In one of my posts, I mentioned using a global variable to hold some "code entered ok" flag, and checking that is set whenever a new dashboard page is opened. The ui_control node can be used to send any unauthorized user back to the pin pad.
