glad-hand

To be overly friendly with (a stranger) in order to gain an advantage.

Not in many a moon had he glad-handed so many people. […] The President, in fact, behaved noticeably like a candidate for reelection.

Whenever I wasn’t glad-handing NTOC [National Threat Operations Center] leadership at headquarters, I spent my time learning everything I could—“hot-desking” with analysts who worked different programs and different types of targets, so as to be able to teach my fellow team members back in Hawaii the newest ways the agency’s tools might be used.

To extend a glad hand (to someone); to welcome warmly.