Changes between Version 1 and Version 2 of TracModWSGI

Timestamp:

Jul 17, 2018, 2:10:22 PM (6 years ago)

Author:

trac

Comment:

--

TracModWSGI

@@ -7 +7 @@
 == The `trac.wsgi` script
 
-Trac can be run on top of mod_wsgi with the help of an application script, which is just a Python file saved with a `.wsgi` extension. 
+Trac can be run on top of mod_wsgi with the help of an application script, which is a Python file saved with a `.wsgi` extension. 
 
 A robust and generic version of this file can be created using the `trac-admin <env> deploy <dir>` command which automatically substitutes the required paths, see TracInstall#cgi-bin. The script should be sufficient for most installations and users not wanting more information can proceed to [#Mappingrequeststothescript configuring Apache].
 
-If you are using Trac with multiple projects, you can specify their common parent directory using the `TRAC_ENV_PARENT_DIR` in trac.wsgi:
+If you are using Trac with multiple projects, you can specify their common parent directory using the `TRAC_ENV_PARENT_DIR` in trac.wsgi (note that this directory should contain //only// Trac environments, no other sub-directories):
 {{{#!python
 def application(environ, start_request):
-    # Add this to config when you have multiple projects                                             
+    # Add this to config when you have multiple projects
     environ.setdefault('trac.env_parent_dir', '/usr/share/trac/projects')  
     ..
@@ -20 +20 @@
 
 === A very basic script
+
 In its simplest form, the script could be:
 
@@ -115 +116 @@
 In order to let Apache run the script, access to the directory in which the script resides is opened up to all of Apache. Additionally, the `WSGIApplicationGroup` directive ensures that Trac is always run in the first Python interpreter created by mod_wsgi. This is necessary because the Subversion Python bindings, which are used by Trac, don't always work in other sub-interpreters and may cause requests to hang or cause Apache to crash. After adding this configuration, restart Apache, and then it should work.
 
-To test the setup of Apache, mod_wsgi and Python itself (ie. without involving Trac and dependencies), this simple wsgi application can be used to make sure that requests gets served (use as only content in your `.wsgi` script):
+To test the setup of Apache, mod_wsgi and Python itself (ie without involving Trac and dependencies), this simple wsgi application can be used to make sure that requests gets served (use as only content in your `.wsgi` script):
 
 {{{#!python
@@ -123 +124 @@
 }}}
 
-For more information about using the mod_wsgi specific directives, see the [http://code.google.com/p/modwsgi/wiki/ mod_wsgi's wiki] and more specifically the [http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac IntegrationWithTrac] page.
+For more information about using the mod_wsgi specific directives, see the [https://code.google.com/archive/p/modwsgi/wikis mod_wsgi's wiki] and more specifically the [https://code.google.com/archive/p/modwsgi/wikis/IntegrationWithTrac.wiki IntegrationWithTrac] page.
 
 == Configuring Authentication
 
-The following sections describe different methods for setting up authentication. See also [http://httpd.apache.org/docs/2.2/howto/auth.html Authentication, Authorization and Access Control] in the Apache guide.
+The following sections describe different methods for setting up authentication. See also [http://httpd.apache.org/docs/2.4/howto/auth.html Authentication, Authorization and Access Control] in the Apache guide.
 
 === Using Basic Authentication
@@ -147 +148 @@
 }}}
 
-  ''See the man page for `htpasswd` for full documentation.''
+See the man page for `htpasswd` for full documentation.
 
 After you've created the users, you can set their permissions using TracPermissions.
@@ -170 +171 @@
 </LocationMatch>
 }}}
-Note that neither a file nor a directory named 'login' needs to exist.[[BR]]
-See also the [http://httpd.apache.org/docs/2.2/mod/mod_auth_basic.html mod_auth_basic] documentation.
+
+Note that neither a file nor a directory named 'login' needs to exist. See also the [https://httpd.apache.org/docs/2.4/mod/mod_auth_basic.html mod_auth_basic] documentation.
 
 === Using Digest Authentication
 
-For better security, it is recommended that you either enable SSL or at least use the “digest” authentication scheme instead of “Basic”. 
+For better security, it is recommended that you either enable SSL or at least use the "digest" authentication scheme instead of "Basic".
 
 You have to create your `.htpasswd` file with the `htdigest` command instead of `htpasswd`, as follows:
@@ -196 +197 @@
 For multiple environments, you can use the same `LocationMatch` as described with the previous method.
 
-'''Note: `Location` cannot be used inside .htaccess files, but must instead live within the main httpd.conf file. If you are on a shared server, you therefore will not be able to provide this level of granularity. '''
+'''Note''': `Location` cannot be used inside .htaccess files, but must instead live within the main httpd.conf file. If you are on a shared server, you therefore will not be able to provide this level of granularity.
 
 Don't forget to activate the mod_auth_digest. For example, on a Debian 4.0r1 (etch) system:
@@ -203 +204 @@
 }}}
 
-See also the [http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html mod_auth_digest] documentation.
+See also the [https://httpd.apache.org/docs/2.4/mod/mod_auth_basic.html mod_auth_digest] documentation.
 
 === Using LDAP Authentication 
 
-Configuration for [http://httpd.apache.org/docs/2.2/mod/mod_ldap.html mod_ldap] authentication in Apache is more involved (httpd 2.2.x and OpenLDAP: slapd 2.3.19).
+Configuration for [https://httpd.apache.org/docs/2.4/mod/mod_ldap.html mod_ldap] authentication in Apache is more involved (httpd 2.2+ and OpenLDAP: slapd 2.3.19).
 
 1. You need to load the following modules in Apache httpd.conf:
@@ -233 +234 @@
   AuthLDAPURL "ldap://directory.example.com:3268/DC=example,DC=com?sAMAccountName?sub?(objectClass=user)"
 }}}
- You will also need to provide an account for Apache to use when checking credentials. As this password will be listed in plaintext in the config, you need to use an account specifically for this task:
+ You will also need to provide an account for Apache to use when checking credentials. As this password will be listed in plain text in the configuration, you need to use an account specifically for this task:
 {{{#!apache
   AuthLDAPBindDN ldap-auth-user@example.com
@@ -265 +266 @@
 
 See also:
- - [http://httpd.apache.org/docs/2.2/mod/mod_authnz_ldap.html mod_authnz_ldap], documentation for mod_authnz_ldap.   
- - [http://httpd.apache.org/docs/2.2/mod/mod_ldap.html mod_ldap], documentation for mod_ldap, which provides connection pooling and a shared cache.
- - [http://trac-hacks.org/wiki/LdapPlugin TracHacks:LdapPlugin] for storing TracPermissions in LDAP.
+ - [https://httpd.apache.org/docs/2.4/mod/mod_authnz_ldap.html mod_authnz_ldap], documentation for mod_authnz_ldap.   
+ - [https://httpd.apache.org/docs/2.4/mod/mod_ldap.html mod_ldap], documentation for mod_ldap, which provides connection pooling and a shared cache.
+ - [https://trac-hacks.org/wiki/LdapPlugin TracHacks:LdapPlugin] for storing TracPermissions in LDAP.
 
 === Using SSPI Authentication
@@ -293 +294 @@
 
 === Using CA !SiteMinder Authentication
-Setup CA !SiteMinder to protect your Trac login URL (e.g. /trac/login).  Then modify the trac.wsgi script generated using `trac-admin <env> deploy <dir>` to add the following lines, which extract the HTTP_SM_USER variable and set it to REMOTE_USER:
+
+Setup CA !SiteMinder to protect your Trac login URL, for example `/trac/login`. Also, make sure the policy is set to include the HTTP_REMOTE_USER variable. If your site allows it, you can set this in `LocalConfig.conf`:
+{{{#!apache
+RemoteUserVar="WHATEVER_IT_SHOULD_BE"
+SetRemoteUser="YES"
+}}}
+
+The specific variable is site-dependent. Ask your site administrator. If your site does not allow the use of `LocalConfig.conf` for security reasons, have your site administrator set the policy on the server to set REMOTE_USER.
+
+Also add a !LogOffUri parameter to the agent configuration, for example `/trac/logout`.
+
+Then modify the trac.wsgi script generated using `trac-admin <env> deploy <dir>` to add the following lines, which extract the `HTTP_REMOTE_USER` variable and set it to `REMOTE_USER`:
 
 {{{#!python
@@ -300 +312 @@
     # strip() is used to remove any spaces on the end of the string
     if 'HTTP_SM_USER' in environ: 
-        environ['REMOTE_USER'] = environ['HTTP_SM_USER'].strip()
+        environ['REMOTE_USER'] = environ['HTTP_REMOTE_USER'].strip()
     ...
 }}}
 
-Note:  you do not need any Apache "Location" directives.
-
-=== Using Apache authentication with the Account Manager plugin's Login form ===
-
-To begin with, see the basic instructions for using the Account Manager plugin's [http://trac-hacks.org/wiki/AccountManagerPlugin/Modules#LoginModule Login module] and its [http://trac-hacks.org/wiki/AccountManagerPlugin/AuthStores#HttpAuthStore HttpAuthStore authentication module].
-
-'''Note:''' If is difficult to get !HttpAuthStore to work with WSGI when using any Account Manager version prior to acct_mgr-0.4. Upgrading is recommended.
-
-Here is an example (from the !HttpAuthStore link) using acct_mgr-0.4 for hosting a single project:
-{{{#!ini
-[components]
-; be sure to enable the component
-acct_mgr.http.HttpAuthStore = enabled
-
-[account-manager]
-; configure the plugin to use a page that is secured with http authentication
-authentication_url = /authFile
-password_store = HttpAuthStore
-}}}
-This will generally be matched with an Apache config like:
-{{{#!apache
-<Location /authFile>
-   …HTTP authentication configuration…
-   Require valid-user
-</Location>
-}}}
-Note that '''authFile''' need not exist (unless you are using Account Manager older than 0.4). See the !HttpAuthStore link above for examples where multiple Trac projects are hosted on a server.
+You do not need any Apache "Location" directives.
 
 === Example: Apache/mod_wsgi with Basic Authentication, Trac being at the root of a virtual host
@@ -338 +324 @@
  - uses Apache basic authentication for Trac authentication.
 
-If you want your Trac to be served from e.g. !http://trac.my-proj.my-site.org, then from the folder e.g. `/home/trac-for-my-proj`, if you used the command `trac-admin the-env initenv` to create a folder `the-env`, and you used `trac-admin the-env deploy the-deploy` to create a folder `the-deploy`, then first:
+If you want your Trac to be served from eg !http://trac.my-proj.my-site.org, then from the folder eg `/home/trac-for-my-proj`, if you used the command `trac-admin the-env initenv` to create a folder `the-env`, and you used `trac-admin the-env deploy the-deploy` to create a folder `the-deploy`, then first:
 
 Create the htpasswd file:
@@ -347 +333 @@
 htpasswd htpasswd seconduser
 }}}
+
 Keep the file above your document root for security reasons.
 
-Create this file e.g. (ubuntu) `/etc/apache2/sites-enabled/trac.my-proj.my-site.org.conf` with the following content:
+Create this file for example `/etc/apache2/sites-enabled/trac.my-proj.my-site.org.conf` on Ubuntu with the following content:
 
 {{{#!apache
@@ -372 +359 @@
 }}}
 
-Note: for subdomains to work you would probably also need to alter `/etc/hosts` and add A-Records to your host's DNS.
+For subdomains to work you would probably also need to alter `/etc/hosts` and add A-Records to your host's DNS.
 
 == Troubleshooting
@@ -378 +365 @@
 === Use a recent version
 
-Please use either version 1.6, 2.4 or later of `mod_wsgi`. Versions prior to 2.4 in the 2.X branch have problems with some Apache configurations that use WSGI file wrapper extension. This extension is used in Trac to serve up attachments and static media files such as style sheets. If you are affected by this problem, attachments will appear to be empty and formatting of HTML pages will appear not to work due to style sheet files not loading properly. Another frequent symptom is that binary attachment downloads are truncated. See mod_wsgi tickets [http://code.google.com/p/modwsgi/issues/detail?id=100 #100] and [http://code.google.com/p/modwsgi/issues/detail?id=132 #132].
-
-''Note: using mod_wsgi 2.5 and Python 2.6.1 gave an Internal Server Error on my system (Apache 2.2.11 and Trac 0.11.2.1). Upgrading to Python 2.6.2 (as suggested [http://www.mail-archive.com/modwsgi@googlegroups.com/msg01917.html here]) solved this for me[[BR]]-- Graham Shanks''
+Please use either version 1.6, 2.4 or later of `mod_wsgi`. Versions prior to 2.4 in the 2.X branch have problems with some Apache configurations that use WSGI file wrapper extension. This extension is used in Trac to serve up attachments and static media files such as style sheets. If you are affected by this problem, attachments will appear to be empty and formatting of HTML pages will appear not to work due to style sheet files not loading properly. Another frequent symptom is that binary attachment downloads are truncated. See mod_wsgi tickets [https://code.google.com/archive/p/modwsgi/issues/100 #100] and [https://code.google.com/archive/p/modwsgi/issues/132 #132].
+
+'''Note''': using mod_wsgi 2.5 and Python 2.6.1 gave an Internal Server Error on my system (Apache 2.2.11 and Trac 0.11.2.1). Upgrading to Python 2.6.2 (as suggested [http://www.mail-archive.com/modwsgi@googlegroups.com/msg01917.html here]) solved this for me[[BR]]-- Graham Shanks
 
 If you plan to use `mod_wsgi` in embedded mode on Windows or with the MPM worker on Linux, then you will need version 3.4 or greater. See [trac:#10675] for details.
@@ -386 +373 @@
 === Getting Trac to work nicely with SSPI and 'Require Group'
 
-If you have set Trac up on Apache, Win32 and configured SSPI, but added a 'Require group' option to your apache configuration, then the SSPIOmitDomain option is probably not working. If it is not working, your usernames in Trac probably look like 'DOMAIN\user' rather than 'user'.
-
-This WSGI script 'fixes' that:
+If you have set Trac up on Apache, Win32 and configured SSPI, but added a 'Require group' option to your Apache configuration, then the SSPIOmitDomain option is probably not working. If it is not working, your usernames in Trac probably look like 'DOMAIN\user' rather than 'user'.
+
+This WSGI script fixes that:
 {{{#!python
 import os
@@ -424 +411 @@
 Now Trac drops the connection after serving a page and the connection count on the database will be kept low.
 
-//This is not a recommended approach though. See also the notes at the bottom of the [http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac mod_wsgi's IntegrationWithTrac] wiki page.//
+//This is not a recommended approach though. See also the notes at the bottom of the [https://code.google.com/archive/p/modwsgi/wikis/IntegrationWithTrac.wiki mod_wsgi's IntegrationWithTrac] wiki page.//
+
+=== Missing Headers and Footers
+
+If python optimizations are enabled, then headers and footers will not be rendered. An error will be raised in Trac 1.0.11 and later when optimizations are enabled.
+
+In your WSGI configuration file, the `WSGIPythonOptimize` setting must be set to `0` (`1` or `2` will not work):
+
+{{{#!apache
+    WSGIPythonOptimize 0
+}}}
+
+On Ubuntu, the WSGI mod configuration is at `/etc/apache2/mods-enabled/wsgi.conf`.
+
+The same issue is seen with `PythonOptimize On` in [TracModPython#Pagelayoutissues ModPython].
 
 === Other resources
 
-For more troubleshooting tips, see also the [TracModPython#Troubleshooting mod_python troubleshooting] section, as most Apache-related issues are quite similar, plus discussion of potential [http://code.google.com/p/modwsgi/wiki/ApplicationIssues application issues] when using mod_wsgi. The wsgi page also has a [http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac Integration With Trac] document.
+For more troubleshooting tips, see also the [TracModPython#Troubleshooting mod_python troubleshooting] section, as most Apache-related issues are quite similar, plus discussion of potential [https://code.google.com/archive/p/modwsgi/wikis/ApplicationIssues.wiki application issues] when using mod_wsgi. The wsgi page also has a [https://code.google.com/archive/p/modwsgi/wikis/IntegrationWithTrac.wiki Integration With Trac] document.
 
 ----