Redis NOAUTH / WRONGPASS / NOPERM:认证前连 PING 都不行,没设密码时 AUTH default 反而成功

  > GET k
      (error) NOAUTH Authentication required.
  认证之前执行 PING             -> NOAUTH
  认证之前执行 ECHO x           -> NOAUTH
  认证之前执行 INFO             -> NOAUTH
  认证之前执行 SELECT 1         -> NOAUTH
  认证之前执行 CLIENT SETNAME   -> NOAUTH
  认证之前执行 COMMAND COUNT    -> NOAUTH
  认证之前执行 HELLO 2          -> NOAUTH
  认证之前执行 AUTH secret      -> 可用
  认证之前执行 RESET            -> 可用
  认证之前执行 QUIT             -> 可用

  > AUTH wrong
      (error) WRONGPASS invalid username-password pair or user is disabled.
  > AUTH default wrong
      (error) WRONGPASS invalid username-password pair or user is disabled.
  > AUTH nosuchuser secret
      (error) WRONGPASS invalid username-password pair or user is disabled.
  > AUTH secret
      "OK"
  > GET k
      (nil)
  > AUTH anything
      (error) ERR AUTH <password> called without any password configured for the default user. Are you sure your configuration is correct?
  > AUTH default anything
      "OK"
  > GET k
      (nil)

  > SET app:1 x
      "OK"
  > SET other:1 x
      (error) NOPERM No permissions to access a key
  > DEL app:1
      (error) NOPERM User app has no permissions to run the 'del' command
  > PUBLISH news:today hi
      (integer) 0
  > PUBLISH secret:ch hi
      (error) NOPERM No permissions to access a channel
  > EVAL return redis.call('GET', 'other:1') 0
      (error) NOPERM User app has no permissions to run the 'eval' command
  > MGET app:1 other:1
      (error) NOPERM User app has no permissions to run the 'mget' command
  ACL LOG(管理员查看拒绝记录)前 4 条的 reason / object / username:
      reason=command context=toplevel object=mget username=app
      reason=command context=toplevel object=eval username=app
      reason=channel context=toplevel object=secret:ch username=app
      reason=command context=toplevel object=del username=app
  > AUTH app apppw
      (error) WRONGPASS invalid username-password pair or user is disabled.

  旧连接(用 secret 认证过)GET k -> (nil)
  CONFIG SET requirepass newpass 之后,旧连接 GET k -> (nil)
  新连接 AUTH secret(旧密码)-> (error) WRONGPASS invalid username-password pair or user is disabled.
  新连接 AUTH newpass -> "OK",GET k -> (nil)
  CONFIG SET requirepass "" 清空之后,全新连接不认证直接 GET k -> (nil)

  AUTH <密码>                    -> OK;之后 PING -> "PONG"
  AUTH default <密码>            -> OK;之后 PING -> "PONG"
  HELLO 2 AUTH default <密码>    -> OK;之后 PING -> "PONG"
  HELLO 2 AUTH default wrong -> (error) WRONGPASS invalid username-password pair or user is disabled.
  redis-cli -p 8140 -a secret PING -> stdout='PONG',stderr="Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe."
  redis-cli -p 8140 PING(不带密码)-> stdout='NOAUTH Authentication required.',stderr=''
  环境变量 REDISCLI_AUTH=secret,redis-cli -p 8140 PING -> stdout='PONG',stderr=''