Offering Sacrifices Today

. The Minchas Chinuch, zt”l, explains that even those who argue nevertheless admit that the makom hamikdash retained its holiness since Dovid purposely did not conquer it. Instead he bought it, sanctifying it for all time.
Rav Shlomo Ulman, zt”l, the author of Yerios Shlomo, asked the Chasam Sofer, zt”l, if there was any way to permit offering korbanos on Har Habayis in our times.
“Presumably this is not possible,” the Chasam Sofer replied. “It is not feasible to offer korbanos there nowadays either because the government will not allow this or due to our defilement. Since we are all tamei mes, someone who goes on har habayis is liable to the punishment of kareis. So until the hidden cache of the ashes of the parah adumah is found, this is apparently forbidden.
“However, the Kaftor V’ferach, zt”l, records a fascinating story regarding this question which seems to teach that there are leniencies in this regard. When the author of Kaftor V’ferach journeyed to Eretz Yisrael he merited to make it to Yerushalayim. While there he showed his sefer to Rabbeinu Boruch who learned through the entire thing and offered a critique.
“When the Kaftor Vaferach mentioned that presumably one who enters the makom habayis today when we are tamei mes is liable for kareis, Rabeinu Boruch agreed but qualified this with a story. ‘In the year 5017, Rabbeinu Chananel of Paris wished to come to Yerushalayim and offer korbanos.’ I was in such a rush to go through the entire sefer that I was unable to ask him two obvious questions on this. Firstly, what about our tumah? Secondly, how can we be sure that the kohein designated to perform the sacrifice is truly a kohein, since we no longer have absolute assurances of the lineage of kohanim?
“But then I realized that at least tumah is not a problem since we are all temaim...”