[connection]
id=askUbuntu
uuid=81255b2e-bdf1-4bdb-b6f5-b94ef16550cd
type=802-11-wireless

[802-11-wireless]
ssid=askUbuntu
mode=infrastructure
mac-address=00:08:CA:E6:76:D8

[ipv6]
method=auto

[ipv4]
method=auto

dbus-send --system --print-reply
    --dest=org.freedesktop.NetworkManager
    "$active_setting_path"  # /org/freedesktop/NetworkManager/Settings/2
    org.freedesktop.NetworkManager.Settings.Connection.GetSettings

array [
  dict entry(
     string "802-11-wireless"
     array [
        dict entry(
           string "ssid"
           variant                   array of bytes "askUbuntu"
        )
        dict entry(
           string "mode"
           variant                   string "infrastructure"
        )
        dict entry(
           string "mac-address"
           variant                   array of bytes [
                 00 08 ca e6 76 d8
              ]
        )
        dict entry(
           string "seen-bssids"
           variant                   array [
                 string "02:1A:11:F8:C5:64"
                 string "02:1A:11:FD:1F:EA"
              ]
        )
     ]
  )
  dict entry(
     string "connection"
     array [
        dict entry(
           string "id"
           variant                   string "askUbuntu"
        )
        dict entry(
           string "uuid"
           variant                   string "81255b2e-bdf1-4bdb-b6f5-b94ef16550cd"
        )
        dict entry(
           string "timestamp"
           variant                   uint64 1383146668
        )
        dict entry(
           string "type"
           variant                   string "802-11-wireless"
        )
     ]
  )
  dict entry(
     string "ipv4"
     array [
        dict entry(
           string "addresses"
           variant                   array [
              ]
        )
        dict entry(
           string "dns"
           variant                   array [
              ]
        )
        dict entry(
           string "method"
           variant                   string "auto"
        )
        dict entry(
           string "routes"
           variant                   array [
              ]
        )
     ]
  )
  dict entry(
     string "ipv6"
     array [
        dict entry(
           string "addresses"
           variant                   array [
              ]
        )
        dict entry(
           string "dns"
           variant                   array [
              ]
        )
        dict entry(
           string "method"
           variant                   string "auto"
        )
        dict entry(
           string "routes"
           variant                   array [
              ]
        )
     ]
  )
]

man nm-settings

/etc/NetworkManager/system-connections

  or distro plugin-specific location