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• Grails: JSONP callback without id and class in JSON file

  - by Klaas

  Hi, I am working on a REST based interface where people get a json file. The client needs to access the file from another Domain. I use jsonp which works so far. My problem is the rendering in Grails. At the moment I use the 'as JSON' to marshalling the object: render "${params.jsoncallback}(${user as JSON})" The Json file getting to the client inclused all attributes, incluing the id and class, which I do not want to have in there. In case it is not jsonp, I do it this way, which works great: render(contentType:'text/json'){ userName user.userName userImage user.userImage : : } So how do I get the id and class attributes out of the json when rendering "user as JSON"? Any idea? best regards, Klaas

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• Apache: https to https redirect

  - by Klaas van Schelven

  I'm trying to get Apache to redirect all http and https traffic to a single endpoint www.example.org. The http part is easy: <VirtualHost *:80> ServerName example.org Redirect permanent / https://www.example.org/ </VirtualHost> # long list of other domains, all redirecting to https://www.example.org/ <VirtualHost *:80> ServerName www.example.org Redirect permanent / https://www.example.org/ </VirtualHost> I'm trying to do something similar for the https. It is my understanding that I need to specify one specific IP address, because the Host directive is also sent encrypted. So the below works: <VirtualHost xx.xx.xx.xx:443> ServerName www.example.org # actual stuff happening here </VirtualHost> However, when I start adding the redirects to the config, like so: <VirtualHost xx.x.xx.xx:443> ServerName example.org Redirect permanent / https://www.example.org/ </VirtualHost> # long list of other domains stuff breaks. $ apache2ctl configtest [warn] VirtualHost xx.xx.xx.xx:443 overlaps with VirtualHost xx.xx.xx.xx:443, the first has precedence, perhaps you need a NameVirtualHost directive If I add a directive like so: NameVirtualHost xx.xx.xx.xx:443 Connecting to the (ssl part of the) server starts to fail. How do I solve this?

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• IP6tables blocks INPUT? can't connect with youtube API

  - by klaas

  I thought to have a simple ipv6 firewall, but it turned out to be hell. Somehow I really can't connect with any ipv6 from my machine unless I set INPUT Policy to ACCEPT. Below my current ip6tables ip6tables -L Chain INPUT (policy DROP) target prot opt source destination ACCEPT all anywhere anywhere state RELATED,ESTABLISHED ACCEPT ipv6-icmp anywhere anywhere ACCEPT tcp anywhere anywhere tcp dpt:http ACCEPT tcp anywhere anywhere tcp dpt:https Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination If I try to connect with any ipv6 adres it doesn't work? telnet gdata.youtube.com 80 Trying 2a00:1450:4013:c00::76... OR telnet gdata.youtube.com 443 Trying 2a00:1450:4013:c00::76... When I set: ip6tables -P INPUT ACCEPT It works.. but then.. well then everything is open? what is going on? Help?

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• Apache2: How to split out the SSL configuration?

  - by Klaas van Schelven

  In Apache2, I'd like to separately define my SSL-related stuff once, and in a separate file from the rest of the configuration. This is mostly a matter of taste, but it also allows me to include the rest of the configuration in my automatic deployment process. I.e.: current situation: # in file: 0000-ourdomain.com.conf (number needs to be low) <VirtualHost xx.xx.xx.xx:443> # SSL part SSLEngine on SSLCertificateFile ....crt SSLCACertificateFile ...pem SSLCertificateChainFile ...intermediate.pem SSLCertificateKeyFile ....wildcard.ourdomain.com.key SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown ServerName www.ourdomain.com ServerAlias ourdomain.com # the actual configuration, as found for xx.xx.xx.xx:80, repeated </VirtualHost> I'd like # in file: 0000-ssl-stuff <VirtualHost xx.xx.xx.xx:443> # SSL part SSLEngine on SSLCertificateFile ....crt SSLCACertificateFile ...pem SSLCertificateChainFile ...intermediate.pem SSLCertificateKeyFile ....wildcard.ourdomain.com.key SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown ServerName www.ourdomain.com ServerAlias ourdomain.com </VirtualHost> # in file: ourdomain.com.conf <VirtualHost xx.xx.xx.xx:443> # the actual configuration, as found for xx.xx.xx.xx:80, repeated </VirtualHost> Unfortunately, this does not seem to work. Apache SSL fails, though it does not give an error message at reload or syntax-check. My best found workaround is to us an Include directive from the 0000-ssl file. Many thanks!

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• Auto Encryption of web.config connection string

  - by Klaas Jan

  I want to encrypt the connection string in web.config, the problem is each time a developer changes the connection string in web.config and publishes, it needs to be encrypted every time in the web server. Is there any way that the connection string can encrypted automatically every time someone publishes it? Note :- All of us work on our local machines other than the server. So encryption using local machine key is not an option.

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• XSS as attack vector even if XSS data not stored?

  - by Klaas van Schelven

  I have a question about XSS Can forms be used as a vector for XSS even if the data is not stored in the database and used at a later point? i.e. in php the code would be this: <form input="text" value="<?= @$_POST['my_field'] ?>" name='my_field'> Showing an alert box (demonstrate that JS can be run) on your own browser is trivial with the code above. But is this exploitable across browsers as well? The only scenario I see is where you trick someone into visiting a certain page, i.e. a combination of CSRF and XSS. "Stored in a database and used at a later point": the scenario I understand about CSS is where you're able to post data to a site that runs JavaScript and is shown on a page in a browser that has greater/different privileges than your own. But, to be clear, this is not wat I'm talking about above.

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• Django: How can I add weight/ordering to a many to many relationship?

  - by Klaas van Schelven

  I'm having Pages with TextBlocks on them. Text Blocks may appear on different pages, pages may have several text blocks on them. Every page may have these blocks in an ordering of it's own. This can be solved by using a separate through parameter. Like so: class TextBlock(models.Model): title = models.CharField(max_length=255) text = models.TextField() class Page(models.Model): textblocks = models.ManyToManyField(TextBlock, through=OrderedTextBlock) class OrderedTextBlock(models.Model): text_block = models.ForeignKey(TextBlock) product_page = models.ForeignKey(ProductPage) weight = models.IntegerField() class Meta: ordering = ('weight',) But I'm not very enthousiastic about the violations of DRY for my app. (There's a lot of ordered ManyToMany relations). Is there a recommended way to go about this?

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• Linux/Apache performance very slow even on local network

  - by klausch

  I have an Ubuntu server machine running Apache and MYSQL. System and version info is as follows: Linux kernel 3.0.0.-12 Apache/2.2.20 MySQL Ver 14.14.Distrib 5.1.58 I am running a few websites on this server, some HTML only, some PHP/MySQL. THe [problem is that response time is very slow, both on static as well as the dynamic sites. Sometimes it takes more than 10 seconds before a response is given, this makes the sites very slow and almost unusable. The problem occurs even when requesting from the local network. I have added the involved subdomains to my /etc/hosts file, and abolve all the problem is not solved by using IP numbers instead of URL's. So there is no DNS lookup issue. I have modified the log format by showing the response times and sometimes a files takes 12 seconds to be served, see the jquery~.js file in the example screenshot. I have no explanation for this extremely long response time, but is is not even the only issue here, some other files takes a long time to be served too, but do not show a long response time in the log file. So probably different tissues are involved here. I cannot find a solution until now, any suggestions??? THanx in advance, Klaas link to screenshot picture from access logfile Some extra configuration info: apache2.conf (comment is removed) LockFile ${APACHE_LOCK_DIR}/accept.lock PidFile ${APACHE_PID_FILE} Timeout 300 KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 5 <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} AccessFileName .htaccess <Files ~ "^\.ht"> Order allow,deny Deny from all Satisfy all </Files> DefaultType text/plain HostnameLookups Off ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel warn Include mods-enabled/*.load Include mods-enabled/*.conf Include httpd.conf Include ports.conf LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" %T/%D" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent Include conf.d/ Include sites-enabled/ And the virtual hostfile for one of the slow sites, in fact it is pretty straightforward... <VirtualHost *:80> ServerAdmin [email protected] ServerSignature EMail ServerName toenjoy.drsklaus.nl DocumentRoot /var/www/toenjoy.drsklaus.nl <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/toenjoy.drsklaus.nl/> Options Indexes FollowSymLinks MultiViews AllowOverride AuthConfig AuthType Basic AuthName "To Enjoy" AuthUserFile /etc/.htpasswd Require user petraaa Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> And the output of free -m: klaas@ubuntu-server:/etc/apache2$ free -m total used free shared buffers cached Mem: 1997 1401 595 0 144 1017 -/+ buffers/cache: 238 1758 Swap: 2035 0 2035 and I have no indication that swapping occurs on the moments the site is slow. I have runned top and it does not appear to be a CPU issue. I have the impression that the spawning of a apache thread could maybe be the bottleneck but it is just a suggestion. Maybe this gives some extra information! EDIT: The problem seemed to be gone for some time but occurs again! And not only with Apache, also connecting using SSH takes a tremendous time, sometimes it takes up to 15 seconds before the keyphrase is asked for. Also scp works very slowly. The behavious is really unpredoctable and makes the server very hard to use. Any ideas...?

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