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.NET Forum / ASP.NET / Web Services / February 2005Accessing files & folders on client/other machine
I have built a web service whose purpose is to copy files from a secure place to client machine and vice versa. The problem I am having is perhaps related to permissions and access rights. For testing purposes, the secure place is setup on the client machine. The client (window app) calls the web service (on a different machine) and connects successfully to the web service. However, when client calls a method that copies the file from secure place to client machine (or vice versa), an UnauthorizedAccessException is thrown. In web.config file, authentication mode = “windows”, identity impersonate=”true”. The secure place folder and the target folder for copy operation on client machine are publicly shared and have explicitly given permission to aspnet_wp account. I even allowed Anonymous Logon to Read& Execute, List Folder Contents and Read. Nothing seems to solve the problem. The problem occurs when I try to verify the existence of the file (on client machine) like this: Dim fiVault FileInfo = New FileInfo(sVaultFileName) If fiVault.Exists ….. End If The Exists always returns false (no exception is thrown). I added some test code here at this point to open and read the file. That caused it to throw an exception of type UnauthorizedAccessException. What am I doing wrong? Is there a better way to accomplish this task? Any help will be highly appreciated. TIA Khalique (By the way I have tested the web service by logging on to web server and using IE to call the web service. That works perfectly fine) By default IE passes the credentials with the request, which is not the default in the client app, so IE works and the app does not. You must set the credentials explicitly in the client app, either using the credentials the user is logged on as, or you can set it to someone else, the latter the user types it in for example. The 2 calls look something like this: myWebService.Credentials = System.Net.CredentialCache.DefaultCredentials myWebService.Credentials = new System.Net.NetworkCredential(...) Check out the Credentials property of the web service in the documentation. >I have built a web service whose purpose is to copy files from a secure >place [quoted text clipped - 32 lines] > (By the way I have tested the web service by logging on to web server and > using IE to call the web service. That works perfectly fine) Thanks Chris, I am setting the credentials before calling the web method. And, inside the web method I have checked that it is set properly. The problem is that Web Service needs to accesss a file on client machine. And when it does, it does not impersonate the user. However, it does impersonate when accessing resources on the Web Server because I am able to connect and query the SQL Server that is running on the Web Server. While in Web Method, can we somehow change the credentials? Will that work in this situation? I mean accessing ressources on client/othermachine? Khalique > By default IE passes the credentials with the request, which is not the > default in the client app, so IE works and the app does not. You must set [quoted text clipped - 41 lines] > > (By the way I have tested the web service by logging on to web server and > > using IE to call the web service. That works perfectly fine) Sorry, I misunderstood. The issue here is called the "double hop" issue. Try hard coding the user name and password in the web.config file on the "impersonate" line to represent a network user that has access to the 3rd computer. The disadvantages are the web app will always run in the context of this user, and the password is visible in the web.config file, but someone must have access to the machine to read the password, so maybe it is not such a big deal. Read more about "double hop" here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sds/sds/trouble shooting_authentication_problems_on_asp_pages.asp Also search it in google, there are other solutions, Kerberos, etc, but not for the faint of heart. > Thanks Chris, > I am setting the credentials before calling the web method. And, inside [quoted text clipped - 65 lines] >> > and >> > using IE to call the web service. That works perfectly fine) Thanks Chris forthe help and the reference. I am looking into the possibility of using kerberos. Khalique > Sorry, I misunderstood. The issue here is called the "double hop" issue. > Try hard coding the user name and password in the web.config file on the [quoted text clipped - 77 lines] > >> > and > >> > using IE to call the web service. That works perfectly fine)
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