User-1262787652 posted
ASP.NET 5 Core MVC application isa running in Debian with Apache.
Controllers below are used to read logs.
Reding syslog works OK.
Reading access and error logs causes error
Permission denied
Access to the path '/var/log/apache2/error.log' is denied.
System.UnauthorizedAccessException: Access to the path '/var/log/apache2/error.log' is denied.
---> System.IO.IOException: Permission denied
--- End of inner exception stack trace ---
at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 errorRewriter)
at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
at System.IO.StreamReader.ValidateArgsAndOpenPath(String path, Encoding encoding, Int32 bufferSize)
...
/var/log/apache2/error.log file, /var and /log directories are marked as readable for everyone.
How to read those logs ? Reading syslog works.
public async Task<IActionResult> Syslog()
{ // this works
return await Logi("/var/log/syslog");
}
public async Task<IActionResult> Errorlog()
{ // this throws permission denied error
return await Logi("/var/log/apache2/error.log");
}
static async Task<IActionResult> Logi( string fail)
{
StringBuilder sb = new("<html><head></head><body><pre>");
using (StreamReader reader = new(fail))
{
string line;
while ((line = await reader.ReadLineAsync()) != null)
sb.AppendLine(line);
}
sb.AppendLine("</pre></body></html>");
return new ContentResult()
{
Content = sb.ToString(),
ContentType = "text/html"
};
}
