起こったこと

GitHubだから云々というわけではないけど
リモートリポジトリにプッシュしようとしたところ以下のメッセージが出た

$ git push origin filling-in-layout
The authenticity of host 'github.com (192.30.255.112)' can't be established.
RSA key fingerprint is SHA256:xxxxxxxxxxxxxxxxxxxxxx.
Are you sure you want to continue connecting (yes/no)? yes
Failed to add the host to the list of known hosts (/Users/xxxxxxxxxxxx/.ssh/known_hosts).
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

（今までこんなの出たかったんだけどな、、、AWSいじってみた時に何かやらかしたのかな、、、）

GitHubとのSSH接続の確認のために以下も実施してみるも同様のメッセージ
（ただ、IPが違う？？）

$ ssh github.com
The authenticity of host 'github.com (192.30.255.113)' can't be established.
RSA key fingerprint is SHA256:xxxxxxxxxxxxxxxxxxxxxxx.
Are you sure you want to continue connecting (yes/no)? yes
Failed to add the host to the list of known hosts (/Users/xxxxxxxxxx/.ssh/known_hosts).
xxxxxxxxxxx@github.com: Permission denied (publickey).

とりあえず「権限がないよ〜」とのことなので、
色々ググった結果「id_rsa」の権限でコケることがあるよとのこと
ふむふむ

$ sudo ls -al ~/.ssh
total 32
-rw-r--r--   1 xxxxxxxxxx  staff   223 12 29 19:43 config
-rw-------   1 xxxxxxxxxx  staff  1766  2 26  2018 id_rsa
-rw-r--r--   1 xxxxxxxxxx  staff   409  2 26  2018 id_rsa.pub
-rw-------   1 xxxxxxxxxx  staff     0 12 29 19:39 known_hosts

いけてそうだぞ？？

ってことは「~/.ssh」自体の権限が違うんじゃね？？

dr--------    7 xxxxxxxxx  staff    224 12 29 19:43 .ssh

怪しい
ググる→権限変更の必要ありそう

$ sudo chmod 700 ~/.ssh
$ sudo ls -al ~
drwx------    7 xxxxxxxxxx  staff    224 12 29 19:43 .ssh

完了
どうだ！？

$ ssh -T git@github.com
The authenticity of host 'github.com (192.30.255.113)' can't be established.
RSA key fingerprint is xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
+---[xxxxxxxx]----+
| xxxxxxxxxxx     |
|xxxxxxxxxxx      |
|xxxxxxxxx        |
|xxxxxxxxxxxx     |
|xxxxxxxxxxx      |
|xxxxxxxxxxxx     |
|xxxxxxxxx        |
| x     x         |
|                 |
+----[xxxxxx]-----+
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,192.30.255.113' (RSA) to the list of known hosts.
Hi esaki11! You've successfully authenticated, but GitHub does not provide shell access.

いけた！