security permissions for creating a file

[Mark]

Hello,

in a simple console application I try to create a file with some code like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Nicholas Paldino [.NET/C# MVP]]

Mark,

You get this exception because you don't have rights to create or open
the file in the directory that it is set in. You need to try and create the
file in a directory that you have rights to, or, if the file exists, check
the rights on the file to make sure that you can open it for writing.

Hope this helps.

 

[Mark]

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark

Mark,

You get this exception because you don't have rights to create or open
the file in the directory that it is set in. You need to try and create the
file in a directory that you have rights to, or, if the file exists, check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Ignacio Machin \( .NET/ C# MVP \)]

hi,

post the text of the exception.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and create the
file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Nicholas Paldino [.NET/C# MVP]]

Are you sure that the security exception is for opening the file then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and create the
file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Mark]

hi

Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

hi,

post the text of the exception.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag news:[email protected]...

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and

create
the

file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Mark]

hi,

what I am trying:

1. I create a file x.cs with notepad nothing more than a main
public static void Main( string[] args )
{
try
{
FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();
}
catch( Exception ex )
{
Console.WriteLine( ex.Message );
};
}

2. built it with csc.exe x.cs and got a x.exe
3. executing x.exe on commandline (local dir, no shares, as admin, no
domain, simple way)
4. got exception - I guess .NET told me that this application is not safe
writing files.
Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

Are you sure that the security exception is for opening the file then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag news:[email protected]...

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and

create
the

file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Willy Denoyette [MVP]]

You loading the executable from a network share.
Programs that are loaded from a network are not trusted to access the local
file system, you have to grant "fulltrust" to the the share you are loading
this application from using caspol.exe.

Willy.

hi,

what I am trying:

1. I create a file x.cs with notepad nothing more than a main
public static void Main( string[] args )
{
try
{
FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();
}
catch( Exception ex )
{
Console.WriteLine( ex.Message );
};
}

2. built it with csc.exe x.cs and got a x.exe
3. executing x.exe on commandline (local dir, no shares, as admin, no
domain, simple way)
4. got exception - I guess .NET told me that this application is not safe
writing files.
Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib,
Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

Are you sure that the security exception is for opening the file
then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and create
the
file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some
code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Nicole Calinoiu]

hi,

what I am trying:

1. I create a file x.cs with notepad nothing more than a main

2. built it with csc.exe x.cs and got a x.exe
3. executing x.exe on commandline (local dir, no shares, as admin, no
domain, simple way)

If you're running the exe from a local hard drive (as opposed to somewhere
on your network), it sounds like you might have modified your CAS policy.
To verify what permissions your executable is being assigned under your
current CAS policy, follow the steps listed in the "How can I test my policy
changes?" section at
http://msdn.microsoft.com/library/en-us/dnnetsec/html/entsecpoladmin.asp.
If your assembly is local, and it's granted anything other than an
unrestricted permission set, your CAS policy has been modified from its
default configuration.

If you are running with modified policy, was it a deliberate change or not?
If it wasn't deliberate, you might want to simply revert to the default
configuration (after backing up your current configuration). If it was
deliberate, then adding a new code group to allow your application to run as
desired might be a better approach.

If your assembly is granted unrestricted permissions under policy, might the
problem stem from use of assembly-level permissions attributes? In
particular, might you be using any attributes with
SecurityAction.RequestOptional?

4. got exception - I guess .NET told me that this application is not safe
writing files.
Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib,
Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

Are you sure that the security exception is for opening the file
then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and create
the
file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some
code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Nicole Calinoiu]

You loading the executable from a network share.

Actually, it sounds like he probably isn't.

Programs that are loaded from a network are not trusted to access the
local file system, you have to grant "fulltrust" to the the share you are
loading this application from using caspol.exe.

Granting full trust in order to allow writing to one file is a wee bit of

Willy.

hi,

what I am trying:

1. I create a file x.cs with notepad nothing more than a main
public static void Main( string[] args )
{
try
{
FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();
}
catch( Exception ex )
{
Console.WriteLine( ex.Message );
};
}

2. built it with csc.exe x.cs and got a x.exe
3. executing x.exe on commandline (local dir, no shares, as admin, no
domain, simple way)
4. got exception - I guess .NET told me that this application is not safe
writing files.
Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib,
Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

"Nicholas Paldino [.NET/C# MVP]" <[email protected]>
schrieb
im Newsbeitrag news:[email protected]...

Are you sure that the security exception is for opening the file
then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in
any
directory.

regards Mark



im Newsbeitrag Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and create
the
file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some
code
like:

FileStream file = new FileStream("test.txt",
FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Willy Denoyette [MVP]]

Actually, it sounds like he probably isn't.

Could be, it would not be the first time someone thinks a mapped drive is a
local disk.

Granting full trust in order to allow writing to one file is a wee bit of
overkill, no? <g>

Nicole,
Sure it is overkill, but at least it's a start, because I'm not sure the OP
knows about CAS at all, if he knew about it, he probably figured the
exception was CAS related, which he didn't.
If he knows about CAS, he might have screwed it's local policy settings
somehow when running from a local disk, which I doubt seriously but I
(whish) could be wrong.


Willy.

 

[Mark]

hi

Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

regards
Mark

hi,

post the text of the exception.

cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag news:[email protected]...

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and

create
the

file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark

 

[Mark]

hi,

what I am trying:

1. I create a file x.cs with notepad nothing more than a main
public static void Main( string[] args )
{
try
{
FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();
}
catch( Exception ex )
{
Console.WriteLine( ex.Message );
};
}

2. built it with csc.exe x.cs and got a x.exe
3. executing x.exe on commandline (local dir, no shares, as admin, no
domain, simple way)
4. got exception - I guess .NET told me that this application is not safe
writing files.
Request for the permission of type
System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

thanks and regards
Mark

Are you sure that the security exception is for opening the file then?
Where is the application loaded from? Are you running it from a network
share, or the internet? If so, then the application is going to be granted
a limited permission set.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi Nicholas,

I tried a console application and as admin I have no restriction in any
directory.

regards Mark



im Newsbeitrag news:[email protected]...

Mark,

You get this exception because you don't have rights to create or
open
the file in the directory that it is set in. You need to try and

create
the

file in a directory that you have rights to, or, if the file exists,
check
the rights on the file to make sure that you can open it for writing.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello,

in a simple console application I try to create a file with some code
like:

FileStream file = new FileStream("test.txt", FileMode.OpenOrCreate,
FileAccess.Write);
StreamWriter sw = new StreamWriter(file);
sw.Write("Hello");
sw.Close();
file.Close();

I will get an error System.Security.SecurityException

Are there only one way to avoid this and how this can be done?

Thanks and regards
Mark