Ssh safe protocols: Unterschied zwischen den Versionen
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| Zeile 13: | Zeile 13: | ||
</pre> | </pre> | ||
;Bei Sicherheitsproblemen diese in die /etc/ssh/sshd_config kopieren und die unsicheren entfernen | ;Bei Sicherheitsproblemen diese in die /etc/ssh/sshd_config kopieren und die unsicheren entfernen | ||
| + | |||
| + | =Datei mit unsicherern Protokollen erstellen= | ||
| + | *cat weak | ||
| + | <pre> | ||
| + | 3des-cbc | ||
| + | aes128-cbc | ||
| + | aes192-cbc | ||
| + | aes256-cbc | ||
| + | arcfour | ||
| + | arcfour128 | ||
| + | arcfour256 | ||
| + | blowfish-cbc | ||
| + | cast128-cbc | ||
| + | rijndael-cbc@lysator.liu.se | ||
| + | </pre> | ||
=clean unsecure protocols= | =clean unsecure protocols= | ||
Version vom 8. März 2021, 09:42 Uhr
- cat /etc/ssh/sshd_config
Ciphers aes128-ctr,aes192-ctr,aes256-ctr HostKeyAlgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha256 MACs hmac-sha2-256,hmac-sha2-512
check Algorithmen
- sshd -T | grep "\(ciphers\|macs\|kexalgorithms\)"
ciphers 3des-cbc,blowfish-cbc,cast128-cbc,arcfour,arcfour128,arcfour256,aes128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com macs hmac-sha1,hmac-sha1-96,hmac-sha2-256,hmac-sha2-512,hmac-md5,hmac-md5-96,hmac-ripemd160,hmac-ripemd160@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-md5-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com kexalgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,curve25519-sha256@libssh.org
- Bei Sicherheitsproblemen diese in die /etc/ssh/sshd_config kopieren und die unsicheren entfernen
Datei mit unsicherern Protokollen erstellen
- cat weak
3des-cbc aes128-cbc aes192-cbc aes256-cbc arcfour arcfour128 arcfour256 blowfish-cbc cast128-cbc rijndael-cbc@lysator.liu.se
clean unsecure protocols
#!/bin/bash sshd -T | grep "\(ciphers\|macs\|kexalgorithms\)" > /tmp/ssh-protocols cp /tmp/ssh-protocols /tmp/ssh-protocols.org while read LINE do sed -ie "s/$LINE,//" /tmp/ssh-protocols done < $1 cat /tmp/ssh-protocols