Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
config(gdm)
gdm
gdm(x86-32)
gdm-plugin-fingerprint
gdm-plugin-smartcard
gdm-user-switch-applet
libgdm.so.1
service(graphical-login)

Requires :

libsystemd-journal.so.0
libgobject-2.0.so.0
libpthread.so.0
rtld(GNU_HASH)
libgdk_pixbuf-2.0.so.0
libselinux.so.1
gnome-keyring-pam
libc.so.6(GLIBC_2.1.3)
libXau => 1.0.4-4
gnome-shell
accountsservice
libc.so.6(GLIBC_2.2)
audit-libs => 1.0.6
/bin/sh
libpthread.so.0(GLIBC_2.0)
libsystemd-login.so.0(LIBSYSTEMD_LOGIN_38)
libpam.so.0(LIBPAM_1.0)
libsystemd-login.so.0(LIBSYSTEMD_LOGIN_43)
libpam.so.0
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(CompressedFileNames) <= 3.0.4-1
xorg-x11-xinit
system-logos
xorg-x11-server-utils
libgdk-3.so.0
libgdm.so.1
systemd
setxkbmap
/sbin/nologin
libsystemd-daemon.so.0(LIBSYSTEMD_DAEMON_31)
libc.so.6
iso-codes
libc.so.6(GLIBC_2.3.4)
libsystemd-daemon.so.0
gnome-settings-daemon => 2.21.92
systemd => 186
libaccountsservice.so.0
libaudit.so.1
libcanberra-gtk3.so.0
libcanberra.so.0
libXrandr.so.2
libc.so.6(GLIBC_2.4)
pulseaudio-gdm-hooks
gnome-icon-theme-symbolic
libgio-2.0.so.0
rpmlib(PayloadIsXz) <= 5.2-1
gnome-session
libgtk-3.so.0
pam => 0:0.99.8.1-11
libsystemd-login.so.0(LIBSYSTEMD_LOGIN_186)
libc.so.6(GLIBC_2.0)
libc.so.6(GLIBC_2.1.2)
libXdmcp.so.6
/usr/sbin/useradd
config(gdm) = 1:3.8.4-27.el7
libsystemd-journal.so.0(LIBSYSTEMD_JOURNAL_38)
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
libc.so.6(GLIBC_2.3)
libXau.so.6
libX11.so.6
libc.so.6(GLIBC_2.1)
dconf
libglib-2.0.so.0
libsystemd-login.so.0(LIBSYSTEMD_LOGIN_31)
libsystemd-login.so.0

Content of RPM :
/etc/dbus-1/system.d/gdm.conf
/etc/dconf/db/gdm.d
/etc/dconf/db/gdm.d/00-upstream-settings
/etc/dconf/db/gdm.d/locks
/etc/dconf/db/gdm.d/locks/00-upstream-settings-locks
/etc/dconf/profile/gdm
/etc/gdm
/etc/gdm/Init
/etc/gdm/Init/Default
/etc/gdm/PostLogin
/etc/gdm/PostLogin/Default.sample
/etc/gdm/PostSession
/etc/gdm/PostSession/Default
/etc/gdm/PreSession
/etc/gdm/PreSession/Default
/etc/gdm/Xsession
/etc/gdm/custom.conf
/etc/pam.d/gdm-autologin
/etc/pam.d/gdm-fingerprint
/etc/pam.d/gdm-launch-environment
/etc/pam.d/gdm-password
/etc/pam.d/gdm-pin
/etc/pam.d/gdm-smartcard
/run/gdm
/usr/bin/gdm-screenshot
/usr/bin/gdmflexiserver
/usr/lib/libgdm.so
/usr/lib/libgdm.so.1
/usr/lib/libgdm.so.1.0.0
/usr/lib/systemd/system/gdm.service
There is 143 files more in these RPM.