使用Symfony Process通过PHP控制交互式过程 [英] Controlling an interactive process with PHP using Symfony Process
问题描述
我试图通过添加新密钥来控制系统 ssh代理使用 ssh-add .为此,我使用了 Symfony Process 组件.
当我从网站上运行此代码时,它工作得很好,但是当我在shell/控制台中运行相同的代码时,ssh-add进程挂在Enter passphrase for <path to key>:
简化的代码看起来像这样
use Symfony\Component\Process\Process;
$keyPath = '<path to key>';
$keyPassword = '<password for unlocking the key>';
$socketPath = '<path to ssh-agent socket>';
$sshAdd = new Process(
"ssh-add {$keyPath}",
null,
[
'SSH_AUTH_SOCK' => $socketPath
],
$keyPassword
);
$sshAdd->run();
如您在上面的代码中看到的,我调用了ssh-add
,在环境中设置了SSH_AUTH_SOCK
,以便ssh-add
可以与代理对话,然后在输入中发送密码.如前所述,当我在Web上下文中运行它时,它可以工作,但是挂在Shell/控制台上下文中.
在控制台中运行时,我做了strace
的操作,相关部分看起来像这样
open("<path to key>", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
write(4, "<key password>", <length of password>) = 20
close(4) = 0
wait4(9650, 0x7fff00ab3554, WNOHANG|WSTOPPED, NULL) = 0
select(8, [5 7], [], [], {0, 0}) = 0 (Timeout)
wait4(9650, 0x7fff00ab3554, WNOHANG|WSTOPPED, NULL) = 0
select(8, [5 7], [], [], {0, 0}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}Enter passphrase for <path to key>:) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
...
您可以看到,写入似乎被忽略了,并且ssh-add
程序开始阻止等待输入.
阅读ssh-add的源代码并阅读 I am trying to control the systems ssh-agent by adding new keys to it using ssh-add. For this I'm using the Symfony Process component. When I run this code from a web site it works perfectly fine but when I run the same code in a shell/console the ssh-add process hangs on A simplified version of the code looks something like this As you can see in the code above I make a call to I did an As you can see the write seems to be ignored and the Finally found a solution to this problem after reading the source for ssh-add and by reading this very old article from Wez Furlong where he talks about adding PTY support to PHP. To quote the article: What this does is similar to creating a pipe to the process, but instead creates master (for your script) and slave (for the process you're running) pty handles using the /dev/ptmx interface of your OS. This allows you to send to, and capture data from, applications that open /dev/tty explicitly--and this is generally done when interactively prompting for a password. Turns out Symfony Process also supports PTY so the original code only needed a couple of changes. First I need to specify I want to use PTY instead of pipes by calling The final code would look something like this (with comments on the changed lines)
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use Symfony\Component\Process\Process;
$keyPath = '<path to key>';
$keyPassword = '<password for unlocking the key>';
$socketPath = '<path to ssh-agent socket>';
$sshAdd = new Process(
"ssh-add {$keyPath}",
null,
[
'SSH_AUTH_SOCK' => $socketPath
],
$keyPassword
);
$sshAdd->run();
ssh-add
, sets the SSH_AUTH_SOCK
in the environment so ssh-add
can talk to the agent and then sends the password in the input. As I said previously, when I run this in a web context it works but it hangs in a shell/console context.strace
of when running in the console and the relevant parts looks like thisopen("<path to key>", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
write(4, "<key password>", <length of password>) = 20
close(4) = 0
wait4(9650, 0x7fff00ab3554, WNOHANG|WSTOPPED, NULL) = 0
select(8, [5 7], [], [], {0, 0}) = 0 (Timeout)
wait4(9650, 0x7fff00ab3554, WNOHANG|WSTOPPED, NULL) = 0
select(8, [5 7], [], [], {0, 0}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}Enter passphrase for <path to key>:) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
select(8, [5 7], [], [], {0, 200000}) = 0 (Timeout)
...
ssh-add
program starts to block waiting for input.
setPty(true)
. Then I need to simulate that the user has pressed ENTER after inputting the password simply by appending a line feed to the input.use Symfony\Component\Process\Process;
$keyPath = '<path to key>';
$keyPassword = '<password for unlocking the key>';
$socketPath = '<path to ssh-agent socket>';
$sshAdd = new Process(
"ssh-add {$keyPath}",
null,
[
'SSH_AUTH_SOCK' => $socketPath
],
$keyPassword . "\n" // Append a line feed to simulate pressing ENTER
);
$sshAdd->setPty(true); // Use PTY instead of the default pipes
$sshAdd->run();