如何在 C#.net 中使用带有.pem 文件的 SFTP？

Question

Problem: I am using C# .net platform to SFTP a file to remote host with a key file/.pem file and no password.

C#.net source code:

ProcessStartInfo p = new ProcessStartInfo
{
    FileName = "sh",
    Arguments = "upload.sh " + file
};
p.RedirectStandardOutput = true;
p.UseShellExecute = false;
p.CreateNoWindow = true;
Process proc1 = new Process();
proc1.StartInfo = p;
proc1.Start();
string result = proc1.StandardOutput.ReadToEnd();
log.InfoFormat(result);

upload.sh:

sftp -i testsftp-key testsftp@sftp.xxx-xxx.com
put  filename

here

1. testsftp-key:.pem filename(key file),
2. testsftp:username,
3. sftp.xxx-xxx.com:host address.
4. filename:file to be uploaded

File is not getting uploaded when exe is executed by rrot user/cronjob. Executing using non-root user like pi uploads the file. Permissions are 777 for all.

Error :

permission denied

How to solve this permission issue?

Answer 1

I found an answer to this:

ProcessStartInfo p = new ProcessStartInfo
{
    FileName = "sh",
    Arguments = "/home/pi/../upload.sh " + file
};
p.RedirectStandardOutput = true;
p.RedirectStandardError = true;
p.UseShellExecute = false;
p.CreateNoWindow = false;
Process proc1 = new Process();
proc1.StartInfo = p;
proc1.Start();
string result = "";
using (System.IO.StreamReader output = proc1.StandardOutput) 
{
    result = output.ReadToEnd();
}
string error = "";
using (System.IO.StreamReader output = proc1.StandardError)
{
    error = output.ReadToEnd();
}
log.InfoFormat("SFTP result: {0}", result);
log.InfoFormat("{0}", error);

I am capturing the redirected stdout and stderr using streamreader. Now i can see the script upload.sh being run successfully and uploading the file to the remote server as well. I took help from here: How to capture Shell command output in C#?