# ------------------------------------------------------------------------
# Gitea proxy rule exclusions plugin
# Copyright (c) 2024 Daniel Demus
#
# This plugin is distributed under Apache Software License (ASL) version 2
# Please see the enclosed LICENSE file for full details.
# ------------------------------------------------------------------------

# Plugin name: gitea-proxy-rule-exclusions
# Plugin description: OWASP CRS 3rd party plugin for Gitea via proxy
# Rule ID block base: 92,000 - 92,999
# Plugin version: 1.1.0

# Documentation can be found here:
# https://git.demus.dk/demus/gitea-proxy-rule-exclusions-plugin.git

# Generic rule to disable plugin
SecRule TX:gitea-proxy-rule-exclusions-plugin_enabled "@eq 0" \
    "id:92001,\
    phase:1,\
    pass,\
    nolog,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    ctl:ruleRemoveById=92002-92999"

#
# [ Local CRS initialization ]
#
# We need to initialize some of the CRS variables also here because plugin setup runs before
# CRS initialization (this is a known limitation of the current plugin architecture). Must be
# kept in sync with CRS default setting.

# Copy of CRS rule 901162.
SecRule &TX:allowed_request_content_type "@eq 0" \
    "id:92902,\
    phase:1,\
    pass,\
    nolog,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    setvar:'tx.allowed_request_content_type=|application/x-www-form-urlencoded| |multipart/form-data| |multipart/related| |text/xml| |application/xml| |application/soap+xml| |application/json| |application/cloudevents+json| |application/cloudevents-batch+json|'"

# Modify CRS rule 901164
SecRule &TX:restricted_extensions "@eq 0" \
    "id:92903,\
    phase:1,\
    pass,\
    nolog,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    setvar:'tx.restricted_extensions=.backup/ .bak/ .cdx/ .cer/ .dat/ .db/ .dbf/ .dll/ .dos/ .htr/ .htw/ .ida/ .idc/ .idq/ .key/ .printer/ .rdb/ .swp/ .sys/'"

# Modify CRS rule 901165. git-upload-pack has it's own content-type and uses the content-encoding header
SecRule REQUEST_URI "@endsWith git-upload-pack" \
    "id:92010,\
    phase:1,\
    pass,\
    t:none,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    nolog,\
    setvar:'tx.allowed_request_content_type=%{TX.allowed_request_content_type} |application/x-git-upload-pack-request|',\
    setvar:'tx.restricted_headers_basic=/proxy/ /lock-token/ /content-range/ /if/ /x-http-method-override/ /x-http-method/ /x-method-override/'"

# Provide a way to whitelist filenames that are in restricted-files.data
SecRule REQUEST_FILENAME "@pmFromFile gitea-proxy-whitelisted-files.data" \
    "id:92020,\
    phase:1,\
    pass,\
    nolog,\
    t:none,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    ctl:ruleRemoveById=930130"

# Gitea is written in Go, so disable PHP-related rules, as a PHP git project would cause false positives
SecAction \
    "id:92040,\
    phase:1,\
    pass,\
    log,\
    t:none,\
    ver:'gitea-proxy-rule-exclusions-plugin/1.2.0',\
    ctl:ruleRemoveByTag=language-php"