The Directory on Ecumenism is at
vatican.va/roman_curia/pontifical_councils/chrstuni/documents/rc_pc_chrstuni_doc_25031993_principles-and-norms-on-ecumenism_en.html .
I think the relevant parts are n. 125 and n. 129-131.
Part of this is:
"
a) Sharing in Sacramental Life with members of the various Eastern Churches …
125. Catholic ministers may lawfully administer the sacraments of penance, Eucharist and the anointing of the sick to members of the Eastern Churches, who ask for these sacraments of their own free will and are properly disposed.
In these particular cases also, due consideration should be given to the discipline of the Eastern Churches for their own faithful and any suggestion of proselytism should be avoided.
*b) Sharing Sacramental Life with Christians of Other Churches and Ecclesial Communities
- The conditions under which a Catholic minister may administer the sacraments of the Eucharist, of penance and of the anointing of the sick to a baptized person who may be found in the circumstances given above (n. 130) are that the person be unable to have recourse for the sacrament desired to a minister of his or her own Church or ecclesial Community, ask for the sacrament of his or her own initiative, manifest Catholic faith in this sacrament and be properly disposed."