Yes, palmistry is legitimate. However, like other spiritual topics such as astrology, it has been heavily corrupted and very little valid information exists regarding palmistry. Some information about palmistry is in High Priestess Maxine Dietrich's audio sermon "Brotherhood of the Serpent."
Brotherhood of the Serpent Audio Sermon Transcripttopic7664.html
"I’ve read hundreds of palms and this has also helped me in analyzing people. Like people that have knotted fingers they’re perfectionists, most of (them). People with small fingernails are, have a tendency towards irritability. People with long fingers, more intellectual and like to live inside their head. And you can look at someone’s hand and you see their future. And palmistry is also, has a strong connection with the mudras because the mounts of the hand, like the Mount of Venus beneath the thumb, that’s your money mount. If you learn your planets, you learn your chakras, and you learn palmistry, astrology and all of this, you can work magick by getting everything to work for you at the time of your ritual. "