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asp.net security : Impersonation problem.
page, it is the user IIS authenticates. But when I try to access Sql server, I get an access denied error message. It looks like asp.net does not impersonate it at sql server side. I can impersonate a specific user in web.config without problem. Is this a bug or by design? I need to give users permissions based on their Windows login and I have a lot of users, but they
It sounds like you have the "network hop" authentication issue. If you're
authenticating from machine A to machine B (without passing a password across the network, so think SSPI), then machine B tries to use those same credentials to go to machine C, then it will fail unless you've configured your used in AD to have the password stored with reversible encryption. Most security experts think that's ridiculous as that's not secure. Thus you need to design your app around this inherent problem. -Brock DevelopMentor http://staff.develop.com/ballen [quoted text, click to view] > When I enable impersonation in web.config and show User identity in > .aspx page, it is the user IIS authenticates. But when I try to access > Sql server, I get an access denied error message. It looks like > asp.net does not impersonate it at sql server side. I can impersonate > a specific user in web.config without problem. Is this a bug or by > design? I need to give users permissions based on their Windows login > and I have a lot of users, but they are not going to access these web > pages at the same time. >
Agreed.
The canonical solution to the double hop problem is to implement Kerberos delegation. There are many references on this newsgroup and on Microsoft's sites that you can search for. Joe K. [quoted text, click to view] "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message news:294593632476972024608624@msnews.microsoft.com... > It sounds like you have the "network hop" authentication issue. If you're > authenticating from machine A to machine B (without passing a password > across the network, so think SSPI), then machine B tries to use those same > credentials to go to machine C, then it will fail unless you've configured > your used in AD to have the password stored with reversible encryption. > Most security experts think that's ridiculous as that's not secure. Thus > you need to design your app around this inherent problem. > > -Brock > DevelopMentor > http://staff.develop.com/ballen > > > >> When I enable impersonation in web.config and show User identity in >> .aspx page, it is the user IIS authenticates. But when I try to access >> Sql server, I get an access denied error message. It looks like >> asp.net does not impersonate it at sql server side. I can impersonate >> a specific user in web.config without problem. Is this a bug or by >> design? I need to give users permissions based on their Windows login >> and I have a lot of users, but they are not going to access these web >> pages at the same time. >> > > >
[quoted text, click to view]
On Tue, 29 Mar 2005 07:29:08 -0800, szhang <szhang@discussions.microsoft.com> wrote: ¤ When I enable impersonation in web.config and show User identity in .aspx ¤ page, it is the user IIS authenticates. But when I try to access Sql server, ¤ I get an access denied error message. It looks like asp.net does not ¤ impersonate it at sql server side. I can impersonate a specific user in ¤ web.config without problem. Is this a bug or by design? I need to give users ¤ permissions based on their Windows login and I have a lot of users, but they ¤ are not going to access these web pages at the same time. Is your SQL Server set up for integrated security and is it specified in your connection string? Paul ~~~~
Thanks for your replies.
Here is my real problem. Our existing asp pages use windows authentication and have no problem accessing sql server. All stored procedures use is_member() function to determine user's permission. It will be too much to rewrite all those stored procedures. Most users are computer illiterate and all applications are on intranet, so security is not a big issue. The new web server is on W2k3. The old one is on W2k and the PDC is still on a NT box. What is the easiest way to get around this problem? [quoted text, click to view] "Joe Kaplan (MVP - ADSI)" wrote:
> Agreed. > > The canonical solution to the double hop problem is to implement Kerberos > delegation. There are many references on this newsgroup and on Microsoft's > sites that you can search for. > > Joe K. > > "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message > news:294593632476972024608624@msnews.microsoft.com... > > It sounds like you have the "network hop" authentication issue. If you're > > authenticating from machine A to machine B (without passing a password > > across the network, so think SSPI), then machine B tries to use those same > > credentials to go to machine C, then it will fail unless you've configured > > your used in AD to have the password stored with reversible encryption. > > Most security experts think that's ridiculous as that's not secure. Thus > > you need to design your app around this inherent problem. > > > > -Brock > > DevelopMentor > > http://staff.develop.com/ballen > > > > > > > >> When I enable impersonation in web.config and show User identity in > >> .aspx page, it is the user IIS authenticates. But when I try to access > >> Sql server, I get an access denied error message. It looks like > >> asp.net does not impersonate it at sql server side. I can impersonate > >> a specific user in web.config without problem. Is this a bug or by > >> design? I need to give users permissions based on their Windows login > >> and I have a lot of users, but they are not going to access these web > >> pages at the same time. > >> > > > > > > > >
Ah, if you are using an NT4 domain controller, than Kerberos delegation is
right out as that requires AD. Just out of curiosity, in the instance where access to SQL works, is SQL server on the same box as the web server? Joe K. [quoted text, click to view] "szhang" <szhang@discussions.microsoft.com> wrote in message news:58DEBED9-2793-46A8-818D-8CCE94EFB0A9@microsoft.com... > Thanks for your replies. > > Here is my real problem. Our existing asp pages use windows authentication > and have no problem accessing sql server. All stored procedures use > is_member() function to determine user's permission. It will be too much > to > rewrite all those stored procedures. Most users are computer illiterate > and > all applications are on intranet, so security is not a big issue. The new > web > server is on W2k3. The old one is on W2k and the PDC is still on a NT box. > What is the easiest way to get around this problem? > > "Joe Kaplan (MVP - ADSI)" wrote: > >> Agreed. >> >> The canonical solution to the double hop problem is to implement Kerberos >> delegation. There are many references on this newsgroup and on >> Microsoft's >> sites that you can search for. >> >> Joe K. >> >> "Brock Allen" <ballen@NOSPAMdevelop.com> wrote in message >> news:294593632476972024608624@msnews.microsoft.com... >> > It sounds like you have the "network hop" authentication issue. If >> > you're >> > authenticating from machine A to machine B (without passing a password >> > across the network, so think SSPI), then machine B tries to use those >> > same >> > credentials to go to machine C, then it will fail unless you've >> > configured >> > your used in AD to have the password stored with reversible encryption. >> > Most security experts think that's ridiculous as that's not secure. >> > Thus >> > you need to design your app around this inherent problem. >> > >> > -Brock >> > DevelopMentor >> > http://staff.develop.com/ballen >> > >> > >> > >> >> When I enable impersonation in web.config and show User identity in >> >> .aspx page, it is the user IIS authenticates. But when I try to access >> >> Sql server, I get an access denied error message. It looks like >> >> asp.net does not impersonate it at sql server side. I can impersonate >> >> a specific user in web.config without problem. Is this a bug or by >> >> design? I need to give users permissions based on their Windows login >> >> and I have a lot of users, but they are not going to access these web >> >> pages at the same time. >> >> >> > >> > >> > >> >> >>
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