PmWiki takes a somewhat, but justifiable, paranoid stance when it comes to the uploads feature. Thus, the default settings for uploads tend to try to restrict the feature as much as possible:
Web upload.php wiki administrators
, config.php :
keep older versions configure PmWiki
<?php if (!defined('PmWiki')) exit(); ## Enable uploads and set a site-wide default upload password. $EnableUpload = 1; $DefaultPasswords['upload'] = crypt('secret');
$UploadDir = "/home/foobar/public_html/uploads"; $UploadUrlFmt = "http://example.com/~foobar/uploads";
Upload directory configuration
Uploads can be configured site-wide, by-group (default), or by-page by changing
To organize uploads by page, use:
$UploadDir Webpublic_html)PmWiki (it differs from one server to the next). Note that you are likely to be required to explicitly create writable group- or page-specific subdirectories as well!
Uploads can be enabled only for specific groups or pages by using a group customization?. Simply set
Restricting total upload size for a group or the whole wiki
Uploads can be restricted to an overall size limit for groups. In the group configuration file (i.e., local/Group.php), add the line
This will limit the total size of uploads for that group to 1000KB --any upload that pushes the total over the limit will be rejected with an error message. This value defaults to zero (unlimited).
Uploads can also be restricted to an overall size limit for all uploads. Add the line
This will limit the total size of uploads for the whole wiki to 10000KB --any upload that pushes the total over the limit will be rejected with an error message. This value defaults to zero (unlimited).
The upload script performs a number of verifications on an uploaded file before storing it in the upload directory. The basic verifications are described below.
Setting an entry to zero disables file uploads of that type altogether:
$UploadExtSize['zip'] = 0; # disallow .zip files $UploadExtSize[''] = 0; # disallow files with no extension
You can limit which types of files are uploadable by disabling all defaults and specifying only desired types
Setting the variable $UploadMax to zero will disable all default file types. Individual file types may then be enabled by setting their maximum size with the variable
# turns off all upload extensions $UploadMaxSize = 0; # enable only these file types for uploading $aSize=100000; // 100 KB file size limitation $UploadExtSize['jpg' ] = $aSize; $UploadExtSize['gif' ] = $aSize; $UploadExtSize['png' ] = $aSize;
Adding new file types to permitted uploads
where ext is the extension to be added, and content-type is the "MIME type", or content-type (which you may find here or on the lower part of this page) to be used for files with that extension. For example, to add the '
Each entry in $UploadExts needs to be the extension and the mime-type associated with that extension, thus:
$UploadExts = array( 'gif' => 'image/gif', 'jpeg' => 'image/jpeg', 'jpg' => 'image/jpeg', 'png' => 'image/png', 'xxx' => 'yyyy/zzz' );
For the types that PmWiki already knows about it's not necessary to repeat them here (the upload.php script adds PmWiki's defaults to whatever the administrator supplies). See also Cookbook:UploadTypes for additional types.
Other file size limits
There are other factors involved that affect upload file sizes. In Apache 2.0, there is a `LimitRequestBody directive that controls the maximum size of anything that is posted (including file uploads). Apache has this defaulted to unlimited size. However, some Linux distributions (e.g., Red Hat Linux) limit postings to 512K so this may need o be changed or increased. (Normally these settings are in an httpd.conf configuration file or in a file in /etc/httpd/conf.d.)
Problem noted on Red Hat 8.0/9.0 with Apache 2.0.x, the error "Requested content-length of 670955 is larger than the configured limit of 524288" was occurring under Apache and a "Page not found" would appear in the browser. Trying the above settings made no change with PHP, but on Red Hat 8.0/9.0 there is an additional PHP config file, /etc/httpd/conf.d/php.conf, and increasing the number on the line "LimitRequestBody 524288" solves the issue.
PHP itself has two limits on file uploads (usually located in
With the variables in place--PmWiki's maximum file size, Apache's request-size limits, and the PHP file size parameters, the maximum uploaded file size will be the smallest of the three variables.
Setting a read password for pages (and groups) will prevent an attached file from being seen or accessed through the page, but to prevent direct access to the file location (the uploads/ directory) one can do the following:
local/config.php .zip :
$UploadExtSize['zip'] = 0; # Disallow uploading .zip files $UploadExtSize[''] = 0; # Disallow files with no extension
Units are in bytes.
It is generated on the fly by the
upload_max_filesize = 8M
php_value post_max_size 63M php_value upload_max_filesize 62M php_value memory_limit 64M php_value max_execution_time 600 php_value default_socket_timeout 600