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无需密码即可远程生成密钥对

tag-icon • tag-icon linux ssh openssh ssh-keys
无需密码即可远程生成密钥对

我正在尝试在远程计算机上生成密钥对（无密码）。我为此使用的命令是：

ssh root@REMOTEIP ssh-keygen -t rsa -f /root/.ssh/id_rsa_new -q -N ""

该命令的输出是：

ssh-keygen: option requires an argument -- N
Usage: ssh-keygen [options]
Options:
  -a trials   Number of trials for screening DH-GEX moduli.
  -B          Show bubblebabble digest of key file.
  -b bits     Number of bits in the key to create.
  -C comment  Provide new comment.
  -c          Change comment in private and public key files.
  -e          Convert OpenSSH to IETF SECSH key file.
  -F hostname Find hostname in known hosts file.
  -f filename Filename of the key file.
  -G file     Generate candidates for DH-GEX moduli.
  -g          Use generic DNS resource record format.
  -H          Hash names in known_hosts file.
  -i          Convert IETF SECSH to OpenSSH key file.
  -l          Show fingerprint of key file.
  -M memory   Amount of memory (MB) to use for generating DH-GEX moduli.
  -N phrase   Provide new passphrase.
  -P phrase   Provide old passphrase.
  -p          Change passphrase of private key file.
  -q          Quiet.
  -R hostname Remove host from known_hosts file.
  -r hostname Print DNS resource record.
  -S start    Start point (hex) for generating DH-GEX moduli.
  -T file     Screen candidates for DH-GEX moduli.
  -t type     Specify type of key to create.
  -v          Verbose.
  -W gen      Generator to use for generating DH-GEX moduli.
  -y          Read private key file and print public key.

当我使用密码时，该命令运行正常：

ssh root@REMOTEIP ssh-keygen -t rsa -f /root/.ssh/id_rsa_new -q -N "12345"

答案1

为了避免这种情况，您必须引用整个命令以避免它被本地 shell 拆分：

ssh root@REMOTEIP "ssh-keygen -t rsa -f /root/.ssh/id_rsa_new -q -N ''"

问题在于ssh，为了兼容rsh（它最初取代了），将整个命令行作为单身的该参数随后传递给远程 shell（在 Unix 上$SHELL -c "your command"）。

  1. 当你跑步时

    ssh root@REMOTEIP ssh-keygen -t rsa -f /root/.ssh/id_rsa_new -q -N ""

  2. 本地 shell 执行

    ["ssh", "root@REMOTEIP", "ssh-keygen", "-t", "rsa", "-f", "/root/.ssh/id_rsa_new", "-q", "-N", ""]

  3. 连接ssh在一起得到

    "ssh-keygen -t rsa -f /root/.ssh/id_rsa_new -q -N "

  4. 远程 shell 再次拆分为

    ["ssh-keygen", "-t", "rsa", "-f", "/root/.ssh/id_rsa_new", "-q", "-N"]

    – 注意缺少的空参数。

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