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  • How do web servers enforce the same-origin policy?

    - by BBnyc
    I'm diving deeper into developing RESTful APIs and have so far worked with a few different frameworks to achieve this. Of course I've run into the same-origin policy, and now I'm wondering how web servers (rather than web browsers) enforce it. From what I understand, some enforcing seems to happen on the browser's end (e.g., honoring a Access-Control-Allow-Origin header received from a server). But what about the server? For example, let's say a web server is hosting a Javascript web app that accesses an API, also hosted on that server. I assume that server would enforce the same-origin policy --- so that only the javascript that is hosted on that server would be allowed to access the API. This would prevent someone else from writing a javascript client for that API and hosting it on another site, right? So how would a web server be able to stop a malicious client that would try to make AJAX requests to its api endpoints while claiming to be running javascript that originated from that same web server? What's the way most popular servers (Apache, nginx) protect against this kind of attack? Or is my understanding of this somehow off the mark? Or is the cross-origin policy only enforced on the client end?

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  • Data access layer design

    - by Sam
    I have a web app and a console application accessing a db. The db has 2 tables (A, B) one of which (A) is specific to the web app. When writing a data access layer, what is the best way to do it? Technically data access layer should provide access to all the data accessible. In doing so, methods to interact with A are exposed to the console application if we have single access layer. Does creating 2 access layers to 2 table in the same database makes any sense? What is a good way to do it?

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  • File Access problems with SLES 10 SP2 OES2 SP1

    - by Blackhawk131
    We have identified a couple of repeatable, demonstrable scenarios with unexplained rejected folder access on our servers for Mac users. Hopefully, this can be presented to Novell for a solution. What we did to demonstrate scenario 1; 1. setup a PC and Mac side-by-side 2. login to our server and open up to a central location on both Mac and PC 3. on the PC in that central location create a folder 4. on the Mac in that central location drag the created folder to the Mac desktop, this should work fine, no problem 5. on the PC rename that folder 6. on the Mac drag a file to that renamed folder, this should error with the following message; a. You cannot copy some of these items to the destination because their names are too long for the destination. Do you want to skip copying these items and continue copying the other items? b. Select skip, response is the filename is copied to the location with zero or small byte size. Try opening it and you get file is corrupted error message. What we did to demonstrate scenario 2; 1. setup a PC and Mac side-by-side 2. login to our server and open up to a central location on both Mac and PC 3. on the PC in that central location create a folder then create a subfolder 4. copy some content into the subfolder 5. on the Mac in that central location drag the created top level folder to the Mac desktop, this should work fine, no problem 6. on the PC rename that subfolder 7. on the Mac drag that top level folder to the Mac desktop, this should error on the Mac with the following; a. The operation cannot be completed because you do not have sufficient privileges for b. The operation cannot be completed because you do not have sufficient privileges for 8. on the Mac, if you open that subfolder you can see the file copied in step 4 above but, you can not open that file, you get the following message if you try; a. There was an error opening this document. You do not have permission to open this file. 9. on the PC drag some content into the top level folder 10. on the Mac you can open that file directly from the server or copy it locally, no problem, however-the subfolder is still corrupted or locked, whichever 11. on the PC rename the top level folder 12. on the Mac that same file just opened in step 10 above is now not accessible, get the following message; a. The document could not be opened. I have observed some variances in the above. For instance, a change on the PC side may take a moment before you can observer or act on the Mac side - kind of like the server is slow to respond. Also, the error message may vary. However, the key is once a folder, or subfolder, gets renamed by a PC, Mac problems commence. The solution is to create a new folder from a PC and copy the contents of the corrupted folder to the new folder and not rename the folder name. This has to be done on a PC because the corrupted folder is not accessible by a Mac user. Another problem that dovetails with the above is that we know certain characters are not allowed for PC folder or filenames. If a Mac user creates a folder with a slash in the file name, from the PC the user does not see that slash in the name. As soon as the PC user copies a file to that folder, the Mac user is locked from that folder. Will get the following error message; - Sorry, the operation could not be completed because an unexpected error occurred. - (Error code - 50) In addition to the above mentioned character issue with folders, the problem is more evil with filenames. If, for example, you create a file with a slash in the filename on a Mac and copy it to the server you will get the following error message; - You cannot copy some of these items to the destination because their names are too long for the destination. Do you want to skip copying these items and continue copying the other items? Select either Stop or Skip buttons. It does not matter which button is selected. The file name gets copied to the destination location at a reduced size. Depending on the file type, the icon associated with the file may or may not be present. Furthermore, if you open that file on the server you will get the following message; - Couldnt open the file. It may be corrupt or a file format that doesnt recognize. From the users perspective, if they are not observant of the icon or file size, they may disregard the error message and think their file has copied as intended. Only later do they discover the file is corrupt if they open that file. I want to make a note on this problem. It is the PC causing the issue. You can change folder and file names all day on a MAC and you don't have a problem as long as a character is not the issue. Once you change the file name or folder name from a PC the entire folder structure from that level down is corrupted. But it has to be resolved from a PC by creating a new folder and copying the contents to the new folder like stated above. Is something not configured correctly? SUSE Linux Enterprise Server 10 (x86_64) VERSION = 10 PATCHLEVEL = 2 LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-x86_64:core-3.0-x86_64" Novell Open Enterprise Server 2.0.1 (x86_64) VERSION = 2.0.1 PATCHLEVEL = 1 BUILD Note: We use Novell clients on all windows systems to connect to the servers for file access and network storage. We use AFP to allow OSx systems to connect to servers.

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  • File Access problems with SLES 10 SP2 OES2 SP1

    - by Blackhawk131
    We have identified a couple of repeatable, demonstrable scenarios with unexplained rejected folder access on our servers for Mac users. Hopefully, this can be presented to Novell for a solution. What we did to demonstrate scenario 1; 1. setup a PC and Mac side-by-side 2. login to our server and open up to a central location on both Mac and PC 3. on the PC in that central location create a folder 4. on the Mac in that central location drag the created folder to the Mac desktop, this should work fine, no problem 5. on the PC rename that folder 6. on the Mac drag a file to that renamed folder, this should error with the following message; a. You cannot copy some of these items to the destination because their names are too long for the destination. Do you want to skip copying these items and continue copying the other items? b. Select skip, response is the filename is copied to the location with zero or small byte size. Try opening it and you get file is corrupted error message. What we did to demonstrate scenario 2; 1. setup a PC and Mac side-by-side 2. login to our server and open up to a central location on both Mac and PC 3. on the PC in that central location create a folder then create a subfolder 4. copy some content into the subfolder 5. on the Mac in that central location drag the created top level folder to the Mac desktop, this should work fine, no problem 6. on the PC rename that subfolder 7. on the Mac drag that top level folder to the Mac desktop, this should error on the Mac with the following; a. The operation cannot be completed because you do not have sufficient privileges for b. The operation cannot be completed because you do not have sufficient privileges for 8. on the Mac, if you open that subfolder you can see the file copied in step 4 above but, you can not open that file, you get the following message if you try; a. There was an error opening this document. You do not have permission to open this file. 9. on the PC drag some content into the top level folder 10. on the Mac you can open that file directly from the server or copy it locally, no problem, however-the subfolder is still corrupted or locked, whichever 11. on the PC rename the top level folder 12. on the Mac that same file just opened in step 10 above is now not accessible, get the following message; a. The document could not be opened. I have observed some variances in the above. For instance, a change on the PC side may take a moment before you can observer or act on the Mac side - kind of like the server is slow to respond. Also, the error message may vary. However, the key is once a folder, or subfolder, gets renamed by a PC, Mac problems commence. The solution is to create a new folder from a PC and copy the contents of the corrupted folder to the new folder and not rename the folder name. This has to be done on a PC because the corrupted folder is not accessible by a Mac user. Another problem that dovetails with the above is that we know certain characters are not allowed for PC folder or filenames. If a Mac user creates a folder with a slash in the file name, from the PC the user does not see that slash in the name. As soon as the PC user copies a file to that folder, the Mac user is locked from that folder. Will get the following error message; - Sorry, the operation could not be completed because an unexpected error occurred. - (Error code - 50) In addition to the above mentioned character issue with folders, the problem is more evil with filenames. If, for example, you create a file with a slash in the filename on a Mac and copy it to the server you will get the following error message; - You cannot copy some of these items to the destination because their names are too long for the destination. Do you want to skip copying these items and continue copying the other items? Select either Stop or Skip buttons. It does not matter which button is selected. The file name gets copied to the destination location at a reduced size. Depending on the file type, the icon associated with the file may or may not be present. Furthermore, if you open that file on the server you will get the following message; - Couldnt open the file. It may be corrupt or a file format that doesnt recognize. From the users perspective, if they are not observant of the icon or file size, they may disregard the error message and think their file has copied as intended. Only later do they discover the file is corrupt if they open that file. I want to make a note on this problem. It is the PC causing the issue. You can change folder and file names all day on a MAC and you don't have a problem as long as a character is not the issue. Once you change the file name or folder name from a PC the entire folder structure from that level down is corrupted. But it has to be resolved from a PC by creating a new folder and copying the contents to the new folder like stated above. Is something not configured correctly? SUSE Linux Enterprise Server 10 (x86_64) VERSION = 10 PATCHLEVEL = 2 LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-x86_64:core-3.0-x86_64" Novell Open Enterprise Server 2.0.1 (x86_64) VERSION = 2.0.1 PATCHLEVEL = 1 BUILD Note: We use Novell clients on all windows systems to connect to the servers for file access and network storage. We use AFP to allow OSx systems to connect to servers.

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  • Question about the evolution of interaction paradigm between web server program and content provider program?

    - by smwikipedia
    Hi experts, In my opinion, web server is responsible to deliver content to client. If it is static content like pictures and static html document, web server just deliver them as bitstream directly. If it is some dynamic content that is generated during processing client's request, the web server will not generate the conetnt itself but call some external proram to genearte the content. AFAIK, this kind of dynamice content generation technologies include the following: CGI ISAPI ... And from here, I noticed that: ...In IIS 7, modules replace ISAPI filters... Is there any others? Could anyone help me complete the above list and elabrate on or show some links to their evolution? I think it would be very helpful to understand application such as IIS, TomCat, and Apache. I once wrote a small CGI program, and though it serves as a content generator, it is still nothing but a normal standalone program. I call it normal because the CGI program has a main() entry point. But with the recenetly technology like ASP.NET, I am not writing complete program, but only some class library. Why does such radical change happens? Many thanks.

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  • Can see samba shares but not access them

    - by nitefrog
    For the life of me I cannot figure this one out. I have samba installed and set up on the ubuntu box and on the Win7 box I CAN SEE all the shares I created. I created two users on ubuntu that map to the users in windows. On ubuntu they are both admins, user A & B on Windows User A is admin and user B is poweruser. User A can see both shares and access them, but user B can see everythin, but only access the homes directory, the other directory throws an error. I have two drives in Ubuntu and this is the smb.config file (I am new to samba): [global] workgroup = WORKGROUP server string = %h server (Samba, Ubuntu) wins support = no dns proxy = yes name resolve order = lmhosts host wins bcast log file = /var/log/samba/log.%m max log size = 1000 syslog = 0 panic action = /usr/share/samba/panic-action %d security = user encrypt passwords = true passdb backend = tdbsam obey pam restrictions = yes unix password sync = yes passwd program = /usr/bin/passwd %u passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* . pam password change = yes map to guest = bad user ; usershare max shares = 100 usershare allow guests = yes And here is the share section: Both user A & B can access this from windows. No problems. [homes] comment = Home Directories browseable = no writable = yes Both User A & B can see this share, but only user A can access it. User B get an error thrown. [stuff] comment = Unixmen File Server path = /media/data/appinstall/ browseable = yes ;writable = no read only = yes hosts allow = The permission for the media/data/appinstall/ is as follows: appInstall properties: share name: stuff Allow others to create and delete files in this folder is cheeked Guest access (for people without a user account) is checked permissions: Owner: user A Folder Access: Create and delete files File Access: --- Group: user A Folder Access: Create and delete files File Access: --- Others Folder Access: Create and delete files File Access: --- I am at a loss and need to get this work. Any ideas? The goal is to have a setup like this. 3 users on window machines. Each user on the data drive will have their own personal folder where they are the ones that can only access, then another folder where 2 of the users will have read only and one user full access. I had this setup before on windows, but after what happened I am NEVER going back to windows, so Unix here I am to stay! I am really stuck. I am running Ubuntu 11. I could reformat again and put on version 10 if that would make life easier. I have been dealing with this since Wed. 3pm. Thanks.

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  • Need help with MS Access 07 & Reports

    - by Moe
    Hey there, I'm finding it difficult to get MS reporting working to what I'd like to show. What I'm trying to do is: a) In my database store a URL file (HTTP external file), that is a .jpeg. I'd like to use that URL to call the image on the report sheet. I have tried to use 'Control source' on the data panel, but with no success. Any way I can get Dynamic Images to show up on each database. Also, I have a couple of Relational Databases. One Defines Values: For Example: DefinePets('petID','Name of Pet') The other one links the Main DB with the 'DefinePets' database. Eg: connect('petID','mainID','extraFeild') I'd like my report to Go into the "connect" Table, where the the currently viewed Record Value = mainID, then find petID and return Name of Pet. There is a many to many link between definePets and the main Table. (Therefore connect is joining them up) Or is that too much to ask from a simple package like Access? Thanks.

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  • Exchange SBS 2003 server stopped receiving mail over the weekend, senders getting "Relay access deni

    - by Charlie W.
    Firstly, I should say that I know my way around Windows very well, I don't really know the first thing about Exchange. I am trying to support a user that is running an SBS2003 Server with Exchange. Over the weekend, everyone sending something to any of his addresses gets an error message like the following: Delivery to the following recipient failed permanently: [email protected] Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <[email protected]>: Relay access denied (state 14). ----- Original message ----- Received: by 10.114.18.7 with SMTP id 7mr5572745war.127.1275423472120; Tue, 01 Jun 2010 13:17:52 -0700 (PDT) MIME-Version: 1.0 Sender: [email protected] Received: by 10.143.10.15 with HTTP; Tue, 1 Jun 2010 13:17:32 -0700 (PDT) From: My Name <[email protected]> Date: Tue, 1 Jun 2010 15:17:32 -0500 X-Google-Sender-Auth: XiPrP8Em_6Eb94EH9m84nJVGvCY Message-ID: <[email protected]> Subject: TEST To: Client <[email protected]> Content-Type: multipart/alternative; boundary=001636b1484ffe72470487fdaa5b There are a host of errors in the Application log, but nothing that leaps out at me as being obvious. But then again, I don't really know what I'm looking for. Any help would be greatly appreciated.

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  • Microsoft Access: computer freezes when user tries to update record

    - by CarlF
    A colleague and I have developed an Access 2003 database which is used throughout our department. Currently about four dozen people do data entry using one of two very similar forms. If 47 of us use them, they work perfectly. If Mr. 48 clicks the "Save" button, Windows XP freezes and a hard reset is needed. The problem has to be on his specific computer (Dell latitude D630) and not in the code because this problem only affects him. Complicating the matter: I don't work for IS, and this project is not supported by IS. If I'm going to get our tech support to fix the problem I had better be able to explain exactly what to do and how to do it, because they aren't going to invest any resources. I don't even have admin rights on the computer (and neither does its regular user). I've asked him to bring his laptop the next time he visits my building. (Just to make matters worse, he doesn't usually work in the same location as me or the other developer.) Any suggestions on debugging the problem? My first try will be to uninstall and reinstall Office, which I can do using corporate utilities without being admin. Note: yes, those are old versions of Office and Windows. We expect to upgrade later this year.

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  • Routing and authenticating all access through squid

    - by Knight Samar
    Hi, I want to route all Internet access in my network through a Squid proxy server and authenticate and log all users. I want this to be a client-independent setting so that no one needs to do anything on their browsers or machines. I have set my network gateway as the proxy server so that all traffic will be sent to it. I have done this using options in DHCP server. Now I tried using squid as a transparent proxy, but then it won't authenticate in that mode. I tried using iptables to route all traffic to port 3128 but it won't popup the authentication dialog box from SQUID. I tried telling DHCP to give WPAD to all clients by placing a WPAD file on a webserver containing the following for automatic proxy configuration on clients: Changes in dhcpd.conf option wpad code 252 =test; option wpad "\n\000"; option wpad "http://192.168.1.5/wpad.dat\n"; The WPAD file: function FindProxyForURL(url,host) { return "PROXY squid-server-ip-address:3128 ; DIRECT "; } But the browsers (different versions of Firefox and IE) seem to ignore it. :( What should I do ?

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  • Wireless Access Point stopped working

    - by Alex Pritchard
    I have a simple LAN set up at home using a Linksys WRT54GSV4 as my primary router and an Encore ENHWI-2AN3 as an access point. I connect the Encore to the Linksys by running a cable from one of the Linksys LAN ports into the Encore WAN input. I originally configured this using the Encore setup wizard, setting the device up in AP Router Mode. It detected the input network and worked about as expected, creating a second network that used my primary network to connect to the internet. It worked fine for about 2 weeks, then abruptly cut out today. I checked to make sure the network was still live through the cable going into the Encore (provides internet when connected to a laptop directly) and that devices are still able to connect to the network being broadcast by the Encore. When I try to rerun the connection wizard on the Encore, I receive the message "No Services found in WAN port." The WAN Settings is no longer retrieving a dynamic ip from the line. I tried providing a static IP, assigning an IP address within the subnet range of my primary router that wasn't being used and pointing the Default Gateway to the Linksys IP, but this did not work either. When I plug the cable into the WAN port, an internet light comes on that is not lit when a live network is not connected. I've tried doing a hard reset on the Encore (held down the rest button until the lights flashed, reconfigured from scratch), but the WAN settings are still not detected. Also tried powering off and on the modem, linksys, and encore. Any suggestions would be appreciated!

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  • No access to Windows 2003 admin shares

    - by ARomo
    This is the environment: Several Win 2003 SP 2 servers and several Win XP SP2 & SP3 clients. All in the same LAN. Firewall is disabled everywhere. No recent Windows updates or configuration changes. This is the problem: Since last Thursday, I log on to any other server or workstation as any regular (non-admin) user and I fail to be able to open ADMIN SHARES ONLY (namely \\server1\c$, \\server1\e$ and \\server1\admin$). The error message is: "\server1\c$ is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed. Disconnect all previous connections to the server or shared resource and try again." I can, however, open the same shares if I use FQDN or IP address: \\server1.domain.local\c$ \\172.0.0.1\c$ Other shares do not have this issue and I can open them without any issue. Any ideas or suggestion would be truly appreciated. Thank you in advance.

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  • Converting plain text in SQL to hyperlink in Access

    - by manemawanna
    Hello, I've just started a new job my first since leaving University and as part of this my first task is to convert a wholly Access 2003 database to an Access front-end, SQL back-end. The Access database consists of a series of front end forms to add or review staff data, as part of this there is hyperlinks pointing to a photograph of the employee and there CV located on a shared drive. These were saved as hyperlinks within the Access DB. I have since converted the data in the Access DB to SQL and stored it in a database for me to test on, now as part of the data conversion the photo and CV locations were converted to nvarchar from hyperlink. I've done this using SSMA. My issue now is that I need to have these text links displayed and working as hyperlinks on the front end hidden behind the words "Photo" and "CV", but am unsure as to how to go about this, as in the past I've only ever used SQL and not Access. Any help or suggestions would be appreciated and if I've not been clear in any areas please feel free to ask questions and I'll try to clear anything up for you.

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  • Query crashes MS Access

    - by user284651
    THE TASK: I am in the process of migrating a DB from MS Access to Maximizer. In order to do this I must take 64 tables in MS ACCESS and merge them into one. The output must be in the form of a TAB or CSV file. Which will then be imported into Maximizer. THE PROBLEM: Access is unable to perform a query that is so complex it seems, as it crashes any time I run the query. ALTERNATIVES: I have thought about a few alternatives, and would like to do the least time-consuming one, out of these, while also taking advantage of any opportunities to learn something new. Export each table into CSVs and import into SQLight and then make a query with it to do the same as what ACCESS fails to do (merge 64 tables). Export each table into CSVs and write a script to access each one and merge the CSVs into a single CSV. Somehow connect to the MS ACCESS DB (API), and write a script to pull data from each table and merge them into a CSV file. QUESTION: What do you recommend?

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  • How do I resolve the Outlook error 0x80042112: The following e-mail messages on the mail server cannot be downloaded...?

    - by Simon
    Outlook email receiving was working fine previously, but now this error message is appearing. Task '[email protected] - Receiving' reported error (0x80042112) : 'The following e-mail messages on the mail server cannot be downloaded. Contact your Internet service provider (ISP) or mail administrator if you continue to receive this error. Unfortunately it doesn't provide much information on what the cause is. Any ideas?

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  • How to set up Gmail in Outlook when the ISP blocks SMTP?

    - by Revolter
    In Outlook, I'm setting up a Gmail account and I'm not able to send mails because my ISP is blocking SMTP forward. Any ways to bypass this? EDIT I've tried different settings, followed Gmail support inscructions and still not working. telnet smtp.gmail.com 465 telnet smtp.gmail.com 587 telnet smtp.gmail.com 25 all of them reply: Connecting To smtp.gmail.com...Could not open connection to the host, on port xxx : Connect failed and I don't have an email acount from my ISP.

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  • Why do some emails sent in Outlook 2010 get stuck in Outbox with date set to "None"?

    - by Matt
    I'm using Outlook 2010 against Exchange 2007. Emails I compose sometimes get stuck in the Outbox with date "None" as shown below. These emails never leave the outbox unless I delete them and recompose. Sometimes the problem happens again until I restart the client. Additionally, if I open a good (one with today's date) email from the outbox and then send it, it too gets dated "None" and never gets sent.

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  • How do I export Outlook 2003 distribution lists to Gmail?

    - by Nick T
    I have several distribution lists in Outlook 2003 that I need to move to Gmail. While transferring contacts in the main folder is fairly easy—all one does is export to CSV and import—it's not as easy with the distribution lists. I can't (don't know how to) copy the contacts from the lists to the main contact folder so they can be "normal", and the "save as" options don't include a CSV. There are several of these to do, containing maybe ~100-200 contacts altogether, so I'd like something that's not very tedious.

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