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取得第一個指紋

tag-icon • tag-icon ssh ssh-tunneling
取得第一個指紋

我對 RSA 指紋的理解是，它基本上是一個金鑰的雜湊值。

我對轉發連接埠的理解是以下部分man ssh：

 -R [bind_address:]port:host:hostport
         Specifies that the given port on the remote (server) host is to
         be forwarded to the given host and port on the local side.  This
         works by allocating a socket to listen to port on the remote
         side, and whenever a connection is made to this port, the connec‐
         tion is forwarded over the secure channel, and a connection is
         made to host port hostport from the local machine.

當使用 ssh 連接到轉送連接埠時，RSA 金鑰指紋的雜湊值是什麼？ 在多台機器上使用相同的 RSA 驗證金鑰將描述我為什麼要問。

或者舉個例子，下面的兩個指紋到底是什麼？

  1. RSA 金鑰指紋為 94:21:d2:fc:70:2d:8d:bb:71:30:0f:4d:52:49:01:43。
  2. RSA 金鑰指紋為 b2:5b:19:25:91:50:3c:45:73:c7:7e:4f:da:c3:f6:f3。

取得第一個指紋

機器1

sshtunnel@pi_one:~ $ ssh -R 2222:localhost:22 [email protected]

普通機

[sshtunnel@devserver ~]$ ssh -p 2222 sshtunnel@localhost
The authenticity of host '[localhost]:2222 ([::1]:2222)' can't be established.
RSA key fingerprint is 94:21:d2:fc:70:2d:8d:bb:71:30:0f:4d:52:49:01:43.
Are you sure you want to continue connecting (yes/no)? no
Host key verification failed.

取得第二個指紋

機器2

sshtunnel@pi_two:~ $ ssh -R 2222:localhost:22 [email protected]

普通機

[sshtunnel@devserver ~]$ ssh -p 2222 sshtunnel@localhost
The authenticity of host '[localhost]:2222 ([::1]:2222)' can't be established.
RSA key fingerprint is b2:5b:19:25:91:50:3c:45:73:c7:7e:4f:da:c3:f6:f3.
Are you sure you want to continue connecting (yes/no)? no
Host key verification failed.
[sshtunnel@devserver ~]$

答案1

主機的公鑰位於/etc/ssh/ssh_host_*_key.pub：

$ ssh localhost
The authenticity of host 'localhost (::1)' can't be established.
ECDSA key fingerprint is 60:6e:7a:10:85:a4:14:f1:37:44:88:17:29:67:b1:e1.
Are you sure you want to continue connecting (yes/no)? ^C

$ ssh-keygen -l -f /etc/ssh/ssh_host_ecdsa_key
256 60:6e:7a:10:85:a4:14:f1:37:44:88:17:29:67:b1:e1 /etc/ssh/ssh_host_ecdsa_key.pub (ECDSA)

ssh-keygen（請注意，如果您要求私鑰的指紋（不含副檔名） ，它並不重要.pub，它會自動讀取相應的公鑰。）

在您的情況下，它是提到的 RSA 金鑰，因此/etc/ssh/ssh_host_rsa_key.pub，透過連接埠轉發，它是ssh最終連接到的主機。

對於較新版本的ssh-keygen，預設輸出是金鑰的 base64 編碼的 SHA256 雜湊值。新增此-E md5選項會給出十六進位編碼的 MD5 雜湊值（但請注意，現在有一個指示雜湊類型的前綴）：

$ ssh-keygen -l -f /etc/ssh/ssh_host_ecdsa_key.pub
256 SHA256:4+dfNAIjGq72HL9UeNEpne8J54yj/4wFpi+/4Bv7dhQ root@... (ECDSA)
$ ssh-keygen -Emd5 -l -f /etc/ssh/ssh_host_ecdsa_key.pub
256 MD5:3c:18:e7:9c:ee:e8:6a:38:7d:74:ef:2f:a5:51:ee:1a root@... (ECDSA)

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