Security Advisories (2)
CVE-2024-58134 (2025-05-03)

Mojolicious versions from 0.999922 for Perl uses a hard coded string, or the application's class name, as a HMAC session secret by default. These predictable default secrets can be exploited to forge session cookies. An attacker who knows or guesses the secret could compute valid HMAC signatures for the session cookie, allowing them to tamper with or hijack another user's session.

CVE-2024-58135 (2025-05-03)

Mojolicious versions from 7.28 for Perl may generate weak HMAC session secrets. When creating a default app with the "mojo generate app" tool, a weak secret is written to the application's configuration file using the insecure rand() function, and used for authenticating and protecting the integrity of the application's sessions. This may allow an attacker to brute force the application's session keys.

NAME

Mojolicious::Plugin::JSONConfig - JSON configuration plugin

SYNOPSIS

# myapp.json (it's just JSON with embedded Perl)
{
  %# Just a value
  "foo": "bar",

  %# Nested data structures are fine too
  "baz": ["♥"],

  %# You have full access to the application
  "music_dir": "<%= app->home->child('music') %>"
}

# Mojolicious
my $config = $app->plugin('JSONConfig');
say $config->{foo};

# Mojolicious::Lite
my $config = plugin 'JSONConfig';
say $config->{foo};

# foo.html.ep
%= config->{foo}

# The configuration is available application-wide
my $config = app->config;
say $config->{foo};

# Everything can be customized with options
my $config = plugin JSONConfig => {file => '/etc/myapp.conf'};

DESCRIPTION

Mojolicious::Plugin::JSONConfig is a JSON configuration plugin that preprocesses its input with Mojo::Template.

The application object can be accessed via $app or the app function. A default configuration filename in the application home directory will be generated from the value of "moniker" in Mojolicious ($moniker.json). You can extend the normal configuration file $moniker.json with mode specific ones like $moniker.$mode.json, which will be detected automatically.

These configuration values are currently reserved:

config_override

If this configuration value has been set in "config" in Mojolicious when this plugin is loaded, it will not do anything besides loading deployment specific plugins.

plugins
"plugins": [{"SetUserGroup": {"user": "sri", "group": "staff"}}]

One or more deployment specific plugins that should be loaded right after this plugin has been loaded.

The code of this plugin is a good example for learning to build new plugins, you're welcome to fork it.

See "PLUGINS" in Mojolicious::Plugins for a list of plugins that are available by default.

OPTIONS

Mojolicious::Plugin::JSONConfig inherits all options from Mojolicious::Plugin::Config and supports the following new ones.

template

# Mojolicious::Lite
plugin JSONConfig => {template => {line_start => '.'}};

Attribute values passed to Mojo::Template object used to preprocess configuration files.

METHODS

Mojolicious::Plugin::JSONConfig inherits all methods from Mojolicious::Plugin::Config and implements the following new ones.

parse

$plugin->parse($content, $file, $conf, $app);

Process content with "render" and parse it with Mojo::JSON.

sub parse ($self, $content, $file, $conf, $app) {
  ...
  $content = $self->render($content, $file, $conf, $app);
  ...
  return $hash;
}

register

my $config = $plugin->register(Mojolicious->new);
my $config = $plugin->register(Mojolicious->new, {file => '/etc/foo.conf'});

Register plugin in Mojolicious application and merge configuration.

render

$plugin->render($content, $file, $conf, $app);

Process configuration file with Mojo::Template.

sub render ($self, $content, $file, $conf, $app) {
  ...
  return $content;
}

SEE ALSO

Mojolicious, Mojolicious::Guides, https://mojolicious.org.