Changes between Version 3 and Version 4 of TracModWSGI


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Timestamp:
Apr 6, 2020, 3:52:17 AM (18 months ago)
Author:
trac
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  • TracModWSGI

    v3 v4  
    77== The `trac.wsgi` script
    88
    9 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.
     9Trac 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.
    1010
    1111A 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].
    1212
    13 If you are using Trac with multiple projects, you can specify their common parent directory using the `TRAC_ENV_PARENT_DIR` in trac.wsgi:
     13If you are using Trac with multiple projects, you can specify their common parent directory in `trac.wsgi`:
    1414{{{#!python
    1515def application(environ, start_request):
    16     # Add this to config when you have multiple projects                                             
     16    # Add this when you have multiple projects
    1717    environ.setdefault('trac.env_parent_dir', '/usr/share/trac/projects') 
    1818    ..
    1919}}}
    2020
     21Directories residing in `trac.env_parent_dir` that are not environment directories will display an error message on the [TracInterfaceCustomization#ProjectList project index page]. The directories can be excluded by listing them in a `.tracignore` file residing in `trac.env_parent_dir`. Unix [https://docs.python.org/2/library/fnmatch.html shell-style wildcard patterns] can be used in the newline separated list of directories.
     22
    2123=== A very basic script
     24
    2225In its simplest form, the script could be:
    2326
     
    115118In 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.
    116119
    117 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):
     120To 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):
    118121
    119122{{{#!python
     
    123126}}}
    124127
    125 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.
     128For 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.
    126129
    127130== Configuring Authentication
    128131
    129 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.
     132The 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.
    130133
    131134=== Using Basic Authentication
     
    147150}}}
    148151
    149   ''See the man page for `htpasswd` for full documentation.''
     152See the man page for `htpasswd` for full documentation.
    150153
    151154After you've created the users, you can set their permissions using TracPermissions.
     
    170173</LocationMatch>
    171174}}}
    172 Note that neither a file nor a directory named 'login' needs to exist.[[BR]]
    173 See also the [http://httpd.apache.org/docs/2.2/mod/mod_auth_basic.html mod_auth_basic] documentation.
     175
     176Note 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.
    174177
    175178=== Using Digest Authentication
    176179
    177 For better security, it is recommended that you either enable SSL or at least use the “digest” authentication scheme instead of “Basic”.
     180For better security, it is recommended that you either enable SSL or at least use the "digest" authentication scheme instead of "Basic".
    178181
    179182You have to create your `.htpasswd` file with the `htdigest` command instead of `htpasswd`, as follows:
     
    196199For multiple environments, you can use the same `LocationMatch` as described with the previous method.
    197200
    198 '''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. '''
     201'''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.
    199202
    200203Don't forget to activate the mod_auth_digest. For example, on a Debian 4.0r1 (etch) system:
     
    203206}}}
    204207
    205 See also the [http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html mod_auth_digest] documentation.
     208See also the [https://httpd.apache.org/docs/2.4/mod/mod_auth_basic.html mod_auth_digest] documentation.
    206209
    207210=== Using LDAP Authentication
    208211
    209 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).
     212Configuration 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).
    210213
    2112141. You need to load the following modules in Apache httpd.conf:
     
    233236  AuthLDAPURL "ldap://directory.example.com:3268/DC=example,DC=com?sAMAccountName?sub?(objectClass=user)"
    234237}}}
    235  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:
     238 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:
    236239{{{#!apache
    237240  AuthLDAPBindDN ldap-auth-user@example.com
     
    265268
    266269See also:
    267  - [http://httpd.apache.org/docs/2.2/mod/mod_authnz_ldap.html mod_authnz_ldap], documentation for mod_authnz_ldap.   
    268  - [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.
    269  - [http://trac-hacks.org/wiki/LdapPlugin TracHacks:LdapPlugin] for storing TracPermissions in LDAP.
     270 - [https://httpd.apache.org/docs/2.4/mod/mod_authnz_ldap.html mod_authnz_ldap], documentation for mod_authnz_ldap.   
     271 - [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.
     272 - [https://trac-hacks.org/wiki/LdapPlugin TracHacks:LdapPlugin] for storing TracPermissions in LDAP.
    270273
    271274=== Using SSPI Authentication
     
    293296
    294297=== Using CA !SiteMinder Authentication
    295 Setup CA !SiteMinder to protect your Trac login URL (e.g. `/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`:
     298
     299Setup 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`:
    296300{{{#!apache
    297301RemoteUserVar="WHATEVER_IT_SHOULD_BE"
    298302SetRemoteUser="YES"
    299303}}}
    300 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.
    301 
    302 Also add a !LogOffUri parameter to the agent configuration (e.g. `/trac/logout`).
     304
     305The 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.
     306
     307Also add a !LogOffUri parameter to the agent configuration, for example `/trac/logout`.
    303308
    304309Then 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`:
     
    313318}}}
    314319
    315 Note:  you do not need any Apache "Location" directives.
    316 
    317 === Using Apache authentication with the Account Manager plugin's Login form ===
    318 
    319 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].
    320 
    321 '''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.
    322 
    323 Here is an example (from the !HttpAuthStore link) using acct_mgr-0.4 for hosting a single project:
    324 {{{#!ini
    325 [components]
    326 ; be sure to enable the component
    327 acct_mgr.http.HttpAuthStore = enabled
    328 
    329 [account-manager]
    330 ; configure the plugin to use a page that is secured with http authentication
    331 authentication_url = /authFile
    332 password_store = HttpAuthStore
    333 }}}
    334 This will generally be matched with an Apache config like:
    335 {{{#!apache
    336 <Location /authFile>
    337    # HTTP authentication configuration
    338    Require valid-user
    339 </Location>
    340 }}}
    341 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.
     320You do not need any Apache "Location" directives.
    342321
    343322=== Example: Apache/mod_wsgi with Basic Authentication, Trac being at the root of a virtual host
     
    347326 - uses Apache basic authentication for Trac authentication.
    348327
    349 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:
     328If 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:
    350329
    351330Create the htpasswd file:
     
    356335htpasswd htpasswd seconduser
    357336}}}
     337
    358338Keep the file above your document root for security reasons.
    359339
    360 Create this file e.g. (ubuntu) `/etc/apache2/sites-enabled/trac.my-proj.my-site.org.conf` with the following content:
     340Create this file for example `/etc/apache2/sites-enabled/trac.my-proj.my-site.org.conf` on Ubuntu with the following content:
    361341
    362342{{{#!apache
     
    381361}}}
    382362
    383 Note: for subdomains to work you would probably also need to alter `/etc/hosts` and add A-Records to your host's DNS.
     363For subdomains to work you would probably also need to alter `/etc/hosts` and add A-Records to your host's DNS.
    384364
    385365== Troubleshooting
     
    387367=== Use a recent version
    388368
    389 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].
    390 
    391 ''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''
     369Please 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].
     370
     371'''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
    392372
    393373If 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.
     
    395375=== Getting Trac to work nicely with SSPI and 'Require Group'
    396376
    397 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'.
    398 
    399 This WSGI script 'fixes' that:
     377If 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'.
     378
     379This WSGI script fixes that:
    400380{{{#!python
    401381import os
     
    433413Now Trac drops the connection after serving a page and the connection count on the database will be kept low.
    434414
    435 //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.//
    436 
    437 === Missing Headers and Footers
    438 
    439 If python optimizations are enabled, then headers and footers will not be rendered.
    440 
    441 In your WSGI configuration file, the `WSGIPythonOptimize` setting must be set to `0` as follows (`1` or `2` will not work):
    442 
    443 {{{#!apache
    444     WSGIPythonOptimize 0
    445 }}}
    446 
    447 On Ubuntu, the WSGI mod configuration is at `/etc/apache2/mods-enabled/wsgi.conf`.
    448 
    449 NOTE: This is the WSGI equivalent of the same issue that happens with `PythonOptimize On` in [TracModPython#Pagelayoutissues ModPython] (see [trac:#8956]).
     415//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.//
    450416
    451417=== Other resources
    452418
    453 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.
     419For 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.
    454420
    455421----