On Tue, 29 Sep 2020, Martin Drescher wrote: > Hi list members, > > just tried to get some old records out of my known_hosts, which is > 'HashKnownHosts yes'. Is there a way to unhash host names and/or > IPs? Google tells about, how to add hosts, but not the opposite, may > be I miss some thing. Is this does not work at all, is there a best > practice for cleaning old hosts and keys out? The hashing is intentionally one-way - you can't go backwards from a hash to a hostname without an inordinate amount of work. You can however find and delete hosts by name using ssh-keygen. To find entries matching a hostname, use "ssh-keygen -F hostname", e.g. $ ssh-keygen -lF haru.mindrot.org # Host haru.mindrot.org found: line 146 haru.mindrot.org ECDSA SHA256:xjGrsgS6JzMojD3go1qULmh02LG8YpRirOwmoHnT/3M # Host haru.mindrot.org found: line 165 haru.mindrot.org RSA SHA256:9nN+SOkKCQq6BLzybAUNlczAU0n+HbOIDxIrBIbPPmU # Host haru.mindrot.org found: line 166 haru.mindrot.org ED25519 SHA256:43S30LGUkc2f9dDcLZG6O5KPKtPn7Xw2WkR2vCO/nnU (the -l flag tells it to print fingerprints instead of full keys) You can also delete entries using "ssh-keygen -R hostname". -d _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
