[AG-DEV] Identity certificates

[Ben Green]

Hi Luis,  I'm sure you have already tried this - but I've had reasonably good success using V4L webcam drivers with Debian and Fedora.  Cheers, Ben.   <!-- Converted from text/plain format  -->
----------------------------------------- Ben Green Access Grid Support Centre Research Computing Services University of Manchester Room G49-H, Kilburn Building Oxford Road, Manchester, M13 9PL tel: +44 (0)161 306 6621 fax: +44 (0)161 275 0637 email - ben.green at manchester.ac.uk web - www.agsc.ja.net -----------------------------------
From: owner-ag-dev at mcs.anl.gov [mailto:owner-ag-dev at mcs.anl.gov] On Behalf Of Luis Galárraga Sent: 14 March 2008 16:22 To: Thomas D. Uram Cc: ag-dev at mcs.anl.gov; openasel-commits at proyectossw.espol.edu.ec; "Ing. Verónica Macías"; Marisol Villacrés Subject: Re: [AG-DEV] Identity certificates Our problem is that it seems VIC does not recognize the connected webcams. We did the test in four computers: two laptops with Ubuntu 7.10, one laptop and a PC with Windows XP. In all cases cameras were tested and recognized by other applications: Cheese, aMSN and VLC in Ubuntu Linux, VLC and Windows Messenger in Windows. VLC did not recognize it automatically in Linux so we had to provide the name of the device file. Then we ran the Venue Client and entered a venue. VIC and RAT started running as expected and audio could be transmitted without any problem, VIC only showed a "Waiting for video" message. When pressing the Menu button in VIC window, we realized that "Transmit button" was disabled in all computers. I read that happens when video capture hardware is not properly configured. We are looking for a way of telling vic the path to the device file of the camera, but no success until now. By the way, these are the webcams we used: Creative VF0050, Genius VideoCam Messenger and VGA Matrix Webcam. We also did another tests transmitting multicast camera streams with vlc with relative success (when transmitting from Windows, there were several problems, VLC frequently froze; in Linux complete happiness) In relation with the add-on services you mentioned, those are good news for us, as we want to provide both Windows and Linux users a simple way to participate in our webinars. Another question: Where can we found the most updated vic and rat documentation? Thanks in advance, Luis 2008/3/14, Thomas D. Uram <turam at mcs.anl.gov>:  Luis: The video capture machine has, in the past, often run Linux, which is why you got that impression from looking at older documentation.  In AG3, vic can use USB cameras, firewire cameras, and dedicated capture cards with either a VFW (older) or WDM/DirectShow (newer) driver. You should be having success in either of these cases. If you're not, we need to look into the cause a little deeper. Provide more details of the problems you ran into, and your configuration, and I/we can help. There are add-on services for transmitting/receiving video using VLC (http://netmedia.gist.ac.kr/agdv/download.html). These have so far only been made available on Windows, but it would be trivial to make them also work under Linux (with VLC; DVTS would be more difficult). Tom  On 3/13/08 10:07 AM, Luis Galárraga wrote: Thanks a lot for your help Tom. I have two additional questions, but they related to audio and video transmision. As I mentioned, our objective are single node users which should have just a webcam and a microphone to participate in a webinar. People here in ESPOL (colleagues but not members of this project), have successfully tested AG in node configuration, but when we tried with a single computer, we could not transmit video. Worried about this fact, I read all documentation about VIC and understood that it requires a video capture card (our colleagues had one) for transmitting video. Reviews and documentation about node configurations indicate that the video capture computer should be a Linux machine with a video capture card and that only in Windows it is possible do it with a usb webcam or a firewire camera (no video card needed). Our tests were in both platforms without success. Do Linux users need a frame grabber for transmit video? Is it possible to use another tool like VLC for transmitting video? We had successful results transmitting multicast video streams from a webcam using VLC in Ubuntu Linux and Windows XP. In addition, we found a way of redirecting raw video to another application instead of showing it with VLC.  Thanks again. Luis, 2008/3/13, Thomas D. Uram <turam at mcs.anl.gov>: Hi Luis: There are a few things you need to know in this regard: - By default, AG3 venues do not require that clients have a certificate to enter.Venues can be optionally configured to require a certificate, in which case the user must present a certificate that satisfies the access controls on the venue. - You can run your own CA and issue your own certificates.In that case, you'll need to make sure your clients have both your CA certificate and their personal certificate. Otherwise, this is general PKI.If you have other questions, don't hesitate to ask. Tom On 3/6/08 3:41 PM, Luis Galárraga wrote: > Greetings: > > I am part of project for developing a webinar infraestructure based on > Access Grid. After a long discussion in which suggestions in this > mailing list were strongly considered, we have decided to implement a > simple client for venues (in servers 3.x) using Java Web Start Apps. > As you can see, there are many things to do, and developers have > started by making tests with the soap interfaces in the our AG server, > however they are not clear about theconcepts behind the > authentication process. We know AG uses digital certificates for > everything: users and services and those certificates are generated by > AG developers (after a process request). Can our developer team > generate certificates signed by us or it is required your sign? > Several people in our university will probably use the system so we > would like to have the privilege to generate the certificates. Could > someone explain us in a better way, the technical issues behind > authentication based on certificates (= how you implemented it)?. I > hope you can help us. > > Thanks in advance, > > Regards, > Luis Galárraga
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/ag-dev/attachments/20080314/41b29cd5/attachment.htm>