Changes between Version 3 and Version 4 of TracModWSGI


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Timestamp:
Nov 26, 2022, 2:15:34 PM (17 months ago)
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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                                             
    17     environ.setdefault('trac.env_parent_dir', '/usr/share/trac/projects') 
     16    # Add this when you have multiple projects
     17    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
    … …  
    4649=== A more elaborate script
    4750
    48 If you are using multiple `.wsgi` files (for example one per Trac environment) you must ''not'' use `os.environ['TRAC_ENV']` to set the path to the Trac environment. Using this method may lead to Trac delivering the content of another Trac environment, as the variable may be filled with the path of a previously viewed Trac environment. 
     51If you are using multiple `.wsgi` files (for example one per Trac environment) you must ''not'' use `os.environ['TRAC_ENV']` to set the path to the Trac environment. Using this method may lead to Trac delivering the content of another Trac environment, as the variable may be filled with the path of a previously viewed Trac environment.
    4952
    5053To solve this problem, use the following `.wsgi` file instead:
    … …  
    5659import trac.web.main
    5760def application(environ, start_response):
    58   environ['trac.env_path'] = '/usr/local/trac/mysite' 
     61  environ['trac.env_path'] = '/usr/local/trac/mysite'
    5962  return trac.web.main.dispatch_request(environ, start_response)
    6063}}}
    6164
    62 For clarity, you should give this file a `.wsgi` extension. You should probably put the file in its own directory, since you will expose it to Apache. 
     65For clarity, you should give this file a `.wsgi` extension. You should probably put the file in its own directory, since you will expose it to Apache.
    6366
    6467If you have installed Trac and Python eggs in a path different from the standard one, you should add that path by adding the following code at the top of the wsgi script:
    … …  
    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 [https://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.
    206 
    207 === Using LDAP Authentication 
    208 
    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).
     208See also the [https://httpd.apache.org/docs/2.4/mod/mod_auth_basic.html mod_auth_digest] documentation.
     209
     210=== Using LDAP Authentication
     211
     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
    272275
    273 If you are using Apache on Windows, you can use mod_auth_sspi to provide single-sign-on. Download the module from the !SourceForge [http://sourceforge.net/projects/mod-auth-sspi/ mod-auth-sspi project] and then add the following to your !VirtualHost:
     276If you are using Apache on Windows, you can use mod_auth_sspi to provide single-sign-on. Download the module from the !SourceForge [https://sourceforge.net/projects/mod-auth-sspi/ mod-auth-sspi project] and then add the following to your !VirtualHost:
    274277{{{#!apache
    275278<Location /trac/login>
    … …  
    293296
    294297=== Using CA !SiteMinder Authentication
    295 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:
    296 
    297 {{{#!python
    298 def application(environ, start_request):
    299     # Set authenticated username on CA SiteMinder to REMOTE_USER variable
     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`:
     300{{{#!apache
     301RemoteUserVar="WHATEVER_IT_SHOULD_BE"
     302SetRemoteUser="YES"
     303}}}
     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`.
     308
     309Then 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`:
     310
     311{{{#!python
     312def application(environ, start_request):
     313    # Set authenticated username on CA SiteMinder to REMOTE_USER variable
    300314    # strip() is used to remove any spaces on the end of the string
    301     if 'HTTP_SM_USER' in environ: 
    302         environ['REMOTE_USER'] = environ['HTTP_SM_USER'].strip()
     315    if 'HTTP_SM_USER' in environ:
     316        environ['REMOTE_USER'] = environ['HTTP_REMOTE_USER'].strip()
    303317    ...
    304318}}}
    305319
    306 Note:  you do not need any Apache "Location" directives.
    307 
    308 === Using Apache authentication with the Account Manager plugin's Login form ===
    309 
    310 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].
    311 
    312 '''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.
    313 
    314 Here is an example (from the !HttpAuthStore link) using acct_mgr-0.4 for hosting a single project:
    315 {{{#!ini
    316 [components]
    317 ; be sure to enable the component
    318 acct_mgr.http.HttpAuthStore = enabled
    319 
    320 [account-manager]
    321 ; configure the plugin to use a page that is secured with http authentication
    322 authentication_url = /authFile
    323 password_store = HttpAuthStore
    324 }}}
    325 This will generally be matched with an Apache config like:
    326 {{{#!apache
    327 <Location /authFile>
    328    …HTTP authentication configuration…
    329    Require valid-user
    330 </Location>
    331 }}}
    332 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.
    333321
    334322=== Example: Apache/mod_wsgi with Basic Authentication, Trac being at the root of a virtual host
    … …  
    338326 - uses Apache basic authentication for Trac authentication.
    339327
    340 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:
    341329
    342330Create the htpasswd file:
    … …  
    347335htpasswd htpasswd seconduser
    348336}}}
     337
    349338Keep the file above your document root for security reasons.
    350339
    351 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:
    352341
    353342{{{#!apache
    … …  
    372361}}}
    373362
    374 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.
    375364
    376365== Troubleshooting
    … …  
    378367=== Use a recent version
    379368
    380 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].
    381 
    382 ''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 [https://www.mail-archive.com/modwsgi@googlegroups.com/msg01917.html here]) solved this for me[[BR]]-- Graham Shanks
    383372
    384373If 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.
    … …  
    386375=== Getting Trac to work nicely with SSPI and 'Require Group'
    387376
    388 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'.
    389 
    390 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:
    391380{{{#!python
    392381import os
    … …  
    424413Now Trac drops the connection after serving a page and the connection count on the database will be kept low.
    425414
    426 //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.//
     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.//
    427416
    428417=== Other resources
    429418
    430 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.
    431420
    432421----