When an ASP.NET application is running under IIS6.0 in Windows 2003 Server with impersonation, what user account is relevant for deciding file read/write/execute access privileges? I have two scenarios where I am trying to understand what access to grant/revoke. I thought the most relevant user is probably the identity specified in the Application Pool, but that doesn't seem to be the whole story.
The first issue concerns executing a local batch file via System.Diagnostics.Process.Start()--I can't do so when the AppPool is set to IWAM_WIN2K3WEB user, but it works fine if it is set to the Network Service identity. I of course made sure that the IWAM user has execute rights on the file.
The second involves writing to a file on the local hard drive--I'd like to be able to prevent doing so via the access control list via folder properties, but even when I set up all users in the folder as "read" (no users/groups with "write" at all), our ASP.NET still writes out the file no problem. How can it if it doesn't have write access?
Google search turns up bits and pieces but never the whole story.
what user account is relevant for [..] file read/write/execute access
As a rule: Always the user account the application/page runs under.
The IWAM account is pretty limited. I don't think it has permissions to start an external process. File access rights are irrelevant at this point.
If a user account (Network Service in your case) owns a file (i.e. has created it), it can do anything to this file, even if not explicitly allowed. Check who owns your file.
Process Monitor from Microsoft is a great tool to track down subtleties like this one.
A bit more searching reveals that the IWAM user isn't that well documented and we should stick with NETWORK SERVICE or a manually-supplied identity if we want to specify permissions for that user.
Related
I have installed Umbraco on my local machine but I have some questions regarding IIS and permissions if someone can help verify that I understand it all correctly. My environment is as follows
• Windows 7 Pro OS
• IIS 7.5 - I have set up a new site in IIS which has the identity Application Pool Identity for the app pool
• Umbraco v7.3.0 – The application files are located in C:\Users[myUsername]\Documents\Visual Studio 2013\Projects\InstallingUmbracoDemo\InstallingUmbracoDemo
Is the following process/understanding correct?
Add a new website in IIS and the application pool name is automatically updated to reflect my sites name.
By default this will use the identity ApplicationPoolIdentity which means that my new sites worker process (w3wp.exe) will run in an application pool that has the same name as my website in IIS
By default when I created my new site it will be added to a user group called IIS_IUSR
If I try to access my application files (that are in a folder that doesn’t not grant permission to the IIS_IUSR user group) it will mean IIS can’t access the resources until I grant the IIS_IUSR user group access
The IUSR user group is used for anonymous access and for anything anonymously requesting my website it will be added to this group
As Umbraco needs to access the internet to install the application I need to a grant permission to IUSR to allow it to do so
Partly because I don’t quite fully understand everything I’m quite concerned about the security of granting permission to IUSR on the root folder where the application files reside. Once Umbraco has installed can this user groups full permission be revoked? Does it require full permission?
I have found the following resource https://our.umbraco.org/wiki/reference/files-and-folders/permissions but if anyone else can provide an overview regarding permissions and the ISUR & IIS_ISUR work and more importantly whether I am understanding this process correctly.
Apologies if I am way of the mark – I’m just trying to learn and ensure i fully understand everything.
Many thanks
Paul
Umbraco will need permission to write files to certain folders on the server as the content/media cache, examine indexes, logs, media, etc are all disk file based.
Have you tried adding the specific AppPool user to the folders and granting permission to it?
Its usually:
IIS AppPool\MyAppPoolNameInIIS
I have had cases where that isn't allowed and I have to use IUSR, but generally this works and seems more specific and contained.
I am attempting to set up an IIS 6.0 application running on Windows Server 2003 to use impersonation in order to avoid having to give users direct read/write access to the shared folders where the DB and web pages are stored. Can anyone provide me with details of how this can be set up to work in conjunction with Windows Integrated Authentication?
So far, I can tell that the web.config file (not sure whether it's the correct one) has the two lines mentioned on this thread (Impersonation in IIS 7.0) to allow impersonation and use the Windows logon method. However, users are still prompted for a logon and then told they are not authorized to view web pages. They can view pages if we turn anonymous logon "on", but then their user credentials aren't passed on to the site and therefore they can't access most of it.
I'm fairly inexperienced, so I'm a bit lost here. Thank you very much in advance for the help!
Thanks to intervention from Microsoft (definitely worth the flat fee they charge per incident), we were able to identify the problem. Instead of using the network path to identify the website location on the "Home Directory" tab of the IIS properties, we were using the local drive path. That was all that needed to be changed.
Once we switched to the network path and added a dedicated service account to "Connect As...", impersonation started working right away. Users pass their logged on credentials via integrated authentication (no logon required) and the service account takes care of executing their actions on the database file.
Access to the shared folder is limited to a brief list of administrators, and data access on the web application is limited based on user names.
If anyone is stuck with this and needs help, let me know!
This message appears every time I try to save the data to the DB.
Failed to update database because the database is read only
Note: This error comes only when the application is installed to C drive.
Front End: VB.NET
Back End:SQL Server
Is there any way to overcome this issue?
Or any way to restrict the user from installing the application on C drive?
I would check the file system privileges. I suppose you talk about an SQL server file database. You receive the message because the account trying to access your file database does not have the file system permissions to do so.
In order to confirm my suggestion, you allow everyone to access the specific directory with full permissions.
Then, you have to check what is the account trying to do the actual access. Probably it's a system account (user ASPNET or NETWORK SERVICE). You have to give the respective permissions to the specific account.
Then, restart IIS.
If you want to do this for a distributed stand-alone application. Then these permissions would have to change on each machine where the program would be installed. In order to avoid putting users in such a fuss, the setup program should do it. I am not an expert on setup programs, but even the simplest ones would give you the option to do it, after asking the system adminstrator's approval. I suppose you could build a custom action during the setup program which would change the specific folder's permissions, perhaps by using xcacls.exe.
Hope I helped!
In Visual Studio 2012, using publish profiles along with web deploy simplifies the deployments quite a bit. However it still is missing few things or may be I don't know how to use it yet.
I prefer to use the NTLM authentication without storing the username and password (especially) in the publish profiles. How can this be done? If I leave the username and password empty, I am prompted for it. Is there a way like manually modifying the .pubxml files?
Why is the username/password stored in PublishProfileName.pubxml that I have checked in the source control and not in PublishProfileName.pubxml.user that is local to each user? I could at least save the username but obviously don't want that to be checked in.
The Configuration itself is not part of PublishProfileName.pubxml but is stored in PublishProfileName.pubxml.user as LastUsedBuildConfiguration.
Same for the Platform as last point.
I am also missing support for multi-server deployments. I am currently forced to use batch files in addition to Publish Profiles.
EDIT
The command line that works fine for publishing is
MSBuild.Exe MyProject.sln /p:Configuration=QA /p:DeployOnBuild=true;PublishProfile=PublishToQA;AllowUntrustedCertificate=true /p:authType=NTLM /p:UserName=
In this I would like to omit the /p:Configuration=QA if the configuration becomes part of the publish profile itself.
Some answers to your questions.
I prefer to use the NTLM authentication without storing the username and password (especially) in the publish profiles. How can
this be done? If I leave the username and password empty, I am
prompted for it. Is there a way like manually modifying the .pubxml
files?
Your authentication is typically driven by how Web Deploy is hosted. By default if you are using the Web Management Service then you are using IIS users for auth. With IIS users you can control which users have permissions to specific sites/apps. You can configure WMSVC to use windows auth as well though. If you have issues using VS for those scenarios let me know.
If you are using the Remote Agent service to host Web Deploy then in this case you'll be using windows auth.
Why is the username/password stored in PublishProfileName.pubxml that I have checked in the source control and not in
PublishProfileName.pubxml.user that is local to each user? I could
at least save the username but obviously don't want that to be checked
in.
We have another mechanism for you to determine what information is private/shared. With the exception of the password all publish info is shared (and checked in by default). In order to simplify the design you can either have a publish profile which is shared, or one which is not shared at all. There is no in-between in which you have a profile that some fields are shared and other not. Password is special cased here and encrypted on a per-user/per-machine basis in the .pubxml.user file.
If you'd like to have a private publish profile then you can simply not check in the .pubxml file which corresponds to the publish profile. These are stored in the Properties\PublishProfiles (or My Project\PublishProfiles for VB) and just exclude them from the project and don't check the files in. The publish dialog looks for the profiles on disk, not just the ones which are in the project. Everything should continue to work.
We don't support the concept of selectively storing values in the .pubxml.user file. The publish dialog will only store a set number of values in that file. Instead of
The Configuration itself is not part of PublishProfileName.pubxml but is stored in
PublishProfileName.pubxml.user as LastUsedBuildConfiguration.
Same for the Platform as last point.
This was a mistake it should have been stored in the .pubxml file, not the .pubxml.user file. We have since fixed this, but haven't had a chance to release the update yet.
The Configuration property cannot be set in the publish profile. The Configuration property is a core part of the build process. To be more specific, the reason why we didn't call this property Configuration is because the .pubxml file is imported into the definition of the .csproj/.vbproj during a build & publish. Since other properties are defined based on Configuration you cannot change the value once it's been set. I just blogged with way too much detail on this subject at http://sedodream.com/2012/10/27/MSBuildHowToSetTheConfigurationProperty.aspx. This limitation is an MSBuild thing not a publish limitation. For command line you should specify Configuration in the following way:
msbuild.exe myproj.csproj /p:...(other properties)... /p:Configuration=
I am also missing support for multi-server deployments. I am currently forced to use batch files in addition to Publish Profiles.
We don't have direct support for this, but if you expand on your needs I may be able to help. FYI I have an extension which you may be interested in. I have posted a 5 min video to http://sedodream.com/2012/03/14/PackageWebUpdatedAndVideoBelow.aspx.
You are free (and encouraged) to manually edit your pubxml files, so feel free to remove the password.
To switch to NTLM, change AuthType to NTLM in the first PropertyGroup.
Platform and Configuration remain build configuration, the user file just stores them so Visual Studio knows what the last configuration you deployed was.
By multi-server, do you mean a web farm? If so, you might try looking at the Web Farm Framework which basically performs MSDeploy syncs from the primary server to the others.
Alternatively, you could switch to the command line and use postSync to upload and execute a batch file on the remote server that triggers the other deployments from there.
Hi Guys any help would be much appreciated.
We have an application that’s installed at several locations but we are having an issue at one particular site. In short the application settings (My.) are not being saved after a reboot. The application is build in VB.Net v3.5 Framework and we are not experiencing any issues elsewhere.
This particular site is using roaming profiles and the network administrator ensures us that the correct permissions are applied to the user account(s) and all application data is being saved to the server. I’ve asked the network admin to check for the existence of the user settings file user.config in the Application Data directory and he says it doesn’t exist.
In our application we store the connection string to the database in the application settings under the user scope. If no connection string is present or if one is present and a connection to the database cannot be made then a form is shown asking the user for the database credentials. Each morning when the users boot the machine and opens the application for the first time they are asked for these credentials but if they close the application and restart it they are not asked for them. This indicates to us that the settings are being saved but once the pc is rebooted and the application is opened for the first time they are asked for the database credentials. This seems like the settings are not persisting after a reboot.
Any thoughts/feedback would be much appreciated.
I'm wondering if it's Code Access Security preventing the file from being written?
If the sysadmin at trouble site has implemented group policy folder redirection, the user's local/roaming profile could be getting stored on a network fileshare. Code Access Security is fairly picky about letting code read/write to/from network resources.
I'm sorry that I don't have more details than this, and I didn't find any sure-fire hits on google, but searching for "code access security", "fulltrust" and any network/fileshare keywords you can think of may get you farther.