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为什么 ssh-copy-id 会提示输入本地用户密码 3 次？

tag-icon • tag-icon ssh password key-authentication
为什么 ssh-copy-id 会提示输入本地用户密码 3 次？

从我的注意到上一个问题当尝试通过 复制 SSH 公钥到远程主机时ssh-copy-id，系统会提示我输入本地用户密码 3 次：

ssh-copy-id myuser@myserver
Password:
Password:
Password:
myuser@myserver's password:

为什么系统提示我输入本地用户密码三次？这是预期的行为吗？另外，幕后发生了什么？

编辑：使用时ssh，它不会提示输入本地用户密码。我的本地密码是笔记本电脑的普通Linux密码，远程计算机是通过同样的打开方式加入Active Directory域的Ubuntu盒子（11.10） 。myuser实际上mydomain\myuseror也是如此[email protected]，转义了\我的角色上一个问题..远程机器/etc/ssh/sshd_config文件如下：

# Package generated configuration file
# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
#Overwritten by lwidentity: ChallengeResponseAuthentication no
ChallengeResponseAuthentication yes

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
KbdInteractiveAuthentication yes

答案1

ssh-copy-id只是执行以下步骤的包装 shell 脚本：

  1. 查找公钥，这包括与 SSH 代理对话，了解哪些密钥可用。
  2. 像任何其他 SSH 客户端一样登录远程服务器
  3. 将一个或多个公钥复制到文件中的远程服务器.ssh/authorized_keys，包括创建该目录（如果该目录不存在且具有正确的权限）。

您可以通过阅读 来亲眼看看它在做什么/usr/bin/ssh-copy-id。复制该文件，在代码中添加一些调试，以查看执行过程中发生了什么以及变量的值是什么。

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