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如何使Expect脚本提示输入密码?

expect prompt passwords

MiniQuark · 技术社区 · 17 年前

我有一个expect脚本,通过ssh连接到一些路由器。所有这些路由器都有相同的密码(我知道,这是错误的),脚本需要知道该密码才能连接到路由器。目前,密码在命令行上作为参数传递给我的脚本,但这意味着在我的.bash_历史文件以及正在运行的进程中都有该密码的痕迹。因此,如果可能的话,我希望提示用户输入密码。

您知道是否可以用expect提示用户输入密码吗?

谢谢您。

编辑 :如果我连接的是服务器而不是路由器,我可能会使用ssh密钥而不是密码。但是我使用的路由器只支持密码。

3 回复 | 直到 8 年前

glenn jackman 17 年前

使用预期 stty 命令如下:

# grab the password
stty -echo
send_user -- "Password for $user@$host: "
expect_user -re "(.*)\n"
send_user "\n"
stty echo
set pass $expect_out(1,string)

#... later
send -- "$pass\r"

注意,打电话很重要 stty -echo 之前打电话 send_user --我不清楚原因:我认为这是个时间问题。

希望程序员都能阅读这个书:唐·利伯斯的《探索期待》

dr-jan 8 年前

好的,合并上面的两个答案(或下面的答案,或它们现在所在的位置!):

#!/usr/bin/expect
log_user 0
set timeout 10
set userid  "XXXXX"
set pass    "XXXXXX"

### Get two arguments - (1) Host (2) Command to be executed
set host    [lindex $argv 0] 
set command [lindex $argv 1]

# grab the password
stty -echo
send_user -- "Password for $userid@$host: "
expect_user -re "(.*)\n"
send_user "\n"
stty echo
set pass $expect_out(1,string)

spawn /usr/bin/ssh -l $userid $host
match_max [expr 32 * 1024]

expect {
    -re "RSA key fingerprint" {send "yes\r"}
    timeout {puts "Host is known"}
}

expect {
     -re "username: " {send "$userid\r"} 
     -re "(P|p)assword: " {send "$pass\r"}
     -re "Warning:" {send "$pass\r"}
     -re "Connection refused" {puts "Host error -> $expect_out(buffer)";exit}
     -re "Connection closed"  {puts "Host error -> $expect_out(buffer)";exit}
     -re "no address.*" {puts "Host error -> $expect_out(buffer)";exit}

     timeout {puts "Timeout error. Is host down or unreachable?? ssh_expect";exit}
}

expect {
   -re "\[#>]$" {send "term len 0\r"}
   timeout {puts "Error reading prompt -> $expect_out(buffer)";exit}
}


expect {
   -re "\[#>]$" {send "$command\r"}

   timeout {puts "Error reading prompt -> $expect_out(buffer)";exit}
}

expect -re "\[#>]$"
set output $expect_out(buffer)
send "exit\r"
puts "$output\r\n"

请注意,我将$password变量更改为$pass,以便与另一个答案保持一致。

qneill Adam Burry 15 年前

或者,您可以让ssh通过x11使用ssh_askpass环境变量收集密码。

从手册页:

> SSH_ASKPASS
>     If ssh needs a passphrase, it will read the passphrase from the
>     current terminal if it was run from a terminal.  If ssh does not
>     have a terminal associated with it but DISPLAY and SSH_ASKPASS
>     are set, it will execute the program specified by SSH_ASKPASS
>     and open an X11 window to read the passphrase.  This is particularly
>     useful when calling ssh from a .xsession or related script.
>     (Note that on some machines it may be necessary to redirect the
>     input from /dev/null to make this work.)