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asp.net security : File Permissions and Impersonation
We have a number of websites running on an IIS6 server all running under their own seperate Anonymous Web account and ASP.Net is configured to Impersonate this account for each site for file system security reasons. The problem comes however when one client needs to write files to their folders and we receive the following error: Server Error in '/' Application. -------------------------------------------------------------------------------- Could not find a part of the path "c:\". Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.DirectoryNotFoundException: Could not find a part of the path "c:\". I can get around this error by adding read permissions for all folders from the drive root to the website directory ie. c:\ and c:\websites and c:\website1 but this means that the client is now able to read the complete file structure to their website which and other sites! Does anyone know of a way of resolving this security issue? Thanks - Steven
Hi!
I'm sure you have your reasons for impersonating some other anonymous user than the default one... Can you configure the page that has to read something from C: to run under the privileges of a more privileged user? Check out the information here about configuring single pages: http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrflocationelement.asp?frame=true Here for impersonation: http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrfIdentitySection.asp?frame=true And here on how to put the password in secure storage: http://support.microsoft.com/default.aspx?scid=kb;en-us;329290 HTH, Lars-Erik [quoted text, click to view] "Steve Winter" <stevewinter001@hotmail.com> wrote in message news:%23D9iN4jgFHA.3936@TK2MSFTNGP10.phx.gbl... > Hi, > > We have a number of websites running on an IIS6 server all running under > their own seperate Anonymous Web account and ASP.Net is configured to > Impersonate this account for each site for file system security reasons. > The problem comes however when one client needs to write files to their > folders and we receive the following error: > > Server Error in '/' Application. > -------------------------------------------------------------------------------- > > Could not find a part of the path "c:\". > Description: An unhandled exception occurred during the execution of the > current web request. Please review the stack trace for more information > about the error and where it originated in the code. > > Exception Details: System.IO.DirectoryNotFoundException: Could not find a > part of the path "c:\". > > I can get around this error by adding read permissions for all folders > from the drive root to the website directory ie. c:\ and c:\websites and > c:\website1 but this means that the client is now able to read the > complete file structure to their website which and other sites! Does > anyone know of a way of resolving this security issue? > > Thanks - Steven >
Hello Lars-Erik Aabech,
are you using Windows 2003? --------------------------------------- Dominick Baier - DevelopMentor http://www.leastprivilege.com [quoted text, click to view] > OK, I think you might get what you want if you remove all > impersonation (don't use <impersonate> in web.config) and then give > the ASPNET user write access on the folder in question. > > Lars-Erik > > "Steve Winter" <stevewinter001@hotmail.com> wrote in message > news:egW26vkgFHA.2852@TK2MSFTNGP15.phx.gbl... > >> Basically all I want to do is to make sure that the one website can >> write to it's own folders but for some strange reason I'm getting >> ACCESS DENIED errors (using FileMon to debug) for all directories >> from the drive root to the website itself. I would have though that >> just providing Write access to the relevant folder in the website >> should be enough without having to give read access as well to all >> folders up from the website to the drive root ?! >> >> "Lars-Erik Aabech" <larserik@newsgroup.nospam> wrote in message >> news:O2AUKNkgFHA.3852@TK2MSFTNGP10.phx.gbl... >> >>> Hi! >>> >>> I'm sure you have your reasons for impersonating some other >>> anonymous >>> user than the default one... >>> Can you configure the page that has to read something from C: to run >>> under the privileges of a more privileged user? >>> Check out the information here about configuring single pages: >>> http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrflocatione >>> lement.asp?frame=true >>> Here for impersonation: >>> http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrfIdentityS >>> ection.asp?frame=true >>> And here on how to put the password in secure storage: >>> http://support.microsoft.com/default.aspx?scid=kb;en-us;329290 >>> HTH, >>> Lars-Erik >>> "Steve Winter" <stevewinter001@hotmail.com> wrote in message >>> news:%23D9iN4jgFHA.3936@TK2MSFTNGP10.phx.gbl... >>> >>>> Hi, >>>> >>>> We have a number of websites running on an IIS6 server all running >>>> under their own seperate Anonymous Web account and ASP.Net is >>>> configured to Impersonate this account for each site for file >>>> system security reasons. The problem comes however when one client >>>> needs to write files to their folders and we receive the following >>>> error: >>>> >>>> Server Error in '/' Application. >>>> ------------------------------------------------------------------- >>>> ------------- >>>> Could not find a part of the path "c:\". >>>> Description: An unhandled exception occurred during the execution >>>> of the >>>> current web request. Please review the stack trace for more >>>> information >>>> about the error and where it originated in the code. >>>> Exception Details: System.IO.DirectoryNotFoundException: Could not >>>> find a part of the path "c:\". >>>> >>>> I can get around this error by adding read permissions for all >>>> folders from the drive root to the website directory ie. c:\ and >>>> c:\websites and c:\website1 but this means that the client is now >>>> able to read the complete file structure to their website which and >>>> other sites! Does anyone know of a way of resolving this security >>>> issue? >>>> >>>> Thanks - Steven >>>>
Basically all I want to do is to make sure that the one website can write to
it's own folders but for some strange reason I'm getting ACCESS DENIED errors (using FileMon to debug) for all directories from the drive root to the website itself. I would have though that just providing Write access to the relevant folder in the website should be enough without having to give read access as well to all folders up from the website to the drive root ?! [quoted text, click to view] "Lars-Erik Aabech" <larserik@newsgroup.nospam> wrote in message news:O2AUKNkgFHA.3852@TK2MSFTNGP10.phx.gbl... > Hi! > > I'm sure you have your reasons for impersonating some other anonymous user > than the default one... > Can you configure the page that has to read something from C: to run under > the privileges of a more privileged user? > Check out the information here about configuring single pages: > http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrflocationelement.asp?frame=true > Here for impersonation: > http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrfIdentitySection.asp?frame=true > And here on how to put the password in secure storage: > http://support.microsoft.com/default.aspx?scid=kb;en-us;329290 > > HTH, > Lars-Erik > > "Steve Winter" <stevewinter001@hotmail.com> wrote in message > news:%23D9iN4jgFHA.3936@TK2MSFTNGP10.phx.gbl... >> Hi, >> >> We have a number of websites running on an IIS6 server all running under >> their own seperate Anonymous Web account and ASP.Net is configured to >> Impersonate this account for each site for file system security reasons. >> The problem comes however when one client needs to write files to their >> folders and we receive the following error: >> >> Server Error in '/' Application. >> -------------------------------------------------------------------------------- >> >> Could not find a part of the path "c:\". >> Description: An unhandled exception occurred during the execution of the >> current web request. Please review the stack trace for more information >> about the error and where it originated in the code. >> >> Exception Details: System.IO.DirectoryNotFoundException: Could not find a >> part of the path "c:\". >> >> I can get around this error by adding read permissions for all folders >> from the drive root to the website directory ie. c:\ and c:\websites and >> c:\website1 but this means that the client is now able to read the >> complete file structure to their website which and other sites! Does >> anyone know of a way of resolving this security issue? >> >> Thanks - Steven >> > >
OK, I think you might get what you want if you remove all impersonation
(don't use <impersonate> in web.config) and then give the ASPNET user write access on the folder in question. Lars-Erik [quoted text, click to view] "Steve Winter" <stevewinter001@hotmail.com> wrote in message news:egW26vkgFHA.2852@TK2MSFTNGP15.phx.gbl... > Basically all I want to do is to make sure that the one website can write > to it's own folders but for some strange reason I'm getting ACCESS DENIED > errors (using FileMon to debug) for all directories from the drive root to > the website itself. I would have though that just providing Write access > to the relevant folder in the website should be enough without having to > give read access as well to all folders up from the website to the drive > root ?! > > > > "Lars-Erik Aabech" <larserik@newsgroup.nospam> wrote in message > news:O2AUKNkgFHA.3852@TK2MSFTNGP10.phx.gbl... >> Hi! >> >> I'm sure you have your reasons for impersonating some other anonymous >> user than the default one... >> Can you configure the page that has to read something from C: to run >> under the privileges of a more privileged user? >> Check out the information here about configuring single pages: >> http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrflocationelement.asp?frame=true >> Here for impersonation: >> http://msdn.microsoft.com/library/en-us/cpgenref/html/gngrfIdentitySection.asp?frame=true >> And here on how to put the password in secure storage: >> http://support.microsoft.com/default.aspx?scid=kb;en-us;329290 >> >> HTH, >> Lars-Erik >> >> "Steve Winter" <stevewinter001@hotmail.com> wrote in message >> news:%23D9iN4jgFHA.3936@TK2MSFTNGP10.phx.gbl... >>> Hi, >>> >>> We have a number of websites running on an IIS6 server all running under >>> their own seperate Anonymous Web account and ASP.Net is configured to >>> Impersonate this account for each site for file system security reasons. >>> The problem comes however when one client needs to write files to their >>> folders and we receive the following error: >>> >>> Server Error in '/' Application. >>> -------------------------------------------------------------------------------- >>> >>> Could not find a part of the path "c:\". >>> Description: An unhandled exception occurred during the execution of the >>> current web request. Please review the stack trace for more information >>> about the error and where it originated in the code. >>> >>> Exception Details: System.IO.DirectoryNotFoundException: Could not find >>> a part of the path "c:\". >>> >>> I can get around this error by adding read permissions for all folders >>> from the drive root to the website directory ie. c:\ and c:\websites and >>> c:\website1 but this means that the client is now able to read the >>> complete file structure to their website which and other sites! Does >>> anyone know of a way of resolving this security issue? >>> >>> Thanks - Steven >>> >> >> > >
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