🍽 Fork YunoHost — snapshot mangé par la machine à tsoins

Upstream: https://github.com/YunoHost/yunohost @ 3a5f8bac8301c450897b96cbd43a4c7d3ba750fb
But (José) : transformer tout le code en bions + ploxions du xerboxion.
La carte de digestion vit au labo : /yunohost-digest.json

helpers/helpers.v2.1.d/fail2ban

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+#!/usr/bin/env bash
+#
+# Copyright (c) 2024 YunoHost Contributors
+#
+# This file is part of YunoHost (see https://yunohost.org)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+# Create a dedicated fail2ban config (jail and filter conf files)
+#
+# usage: ynh_config_add_fail2ban --logpath=log_file --failregex=filter
+# | arg: --logpath=   - Log file to be checked by fail2ban
+# | arg: --failregex= - Failregex to be looked for by fail2ban
+#
+# If --logpath / --failregex are provided, the helper will generate the appropriate conf using these.
+#
+# Otherwise, it will assume that the app provided templates, namely
+# `../conf/f2b_jail.conf` and `../conf/f2b_filter.conf`
+#
+# They will typically look like (for example here for synapse):
+#
+# ```toml
+# f2b_jail.conf:
+#     [__APP__]
+#     enabled = true
+#     port = http,https
+#     filter = __APP__
+#     logpath = /var/log/__APP__/logfile.log
+#     maxretry = 5
+# ```
+#
+# ```toml
+# f2b_filter.conf:
+#     [INCLUDES]
+#     before = common.conf
+#     [Definition]
+#
+#     # Part of regex definition (just used to make more easy to make the global regex)
+#     __synapse_start_line = .? \- synapse\..+ \-
+#
+#    # Regex definition.
+#    failregex = ^%(__synapse_start_line)s INFO \- POST\-(\d+)\- <HOST> \- \d+ \- Received request\: POST /_matrix/client/r0/login\??<SKIPLINES>%(__synapse_start_line)s INFO \- POST\-\1\- Got login request with identifier: \{u'type': u'm.id.user', u'user'\: u'(.+?)'\}, medium\: None, address: None, user\: u'\5'<SKIPLINES>%(__synapse_start_line)s WARNING \- \- (Attempted to login as @\5\:.+ but they do not exist|Failed password login for user @\5\:.+)$
+#
+#     ignoreregex =
+# ```
+#
+# ##### Regarding the the `failregex` option
+#
+# regex to match the password failure messages in the logfile. The host must be
+# matched by a group named "`host`". The tag "`<HOST>`" can be used for standard
+# IP/hostname matching and is only an alias for `(?:::f{4,6}:)?(?P<host>[\w\-.^_]+)`
+#
+# You can find some more explainations about how to make a regex on [the official fail2ban documentation](https://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Filters).
+#
+# To validate your regex you can test with this command:
+#
+# ```bash
+# fail2ban-regex /var/log/YOUR_LOG_FILE_PATH /etc/fail2ban/filter.d/YOUR_APP.conf
+# ```
+ynh_config_add_fail2ban() {
+    # ============ Argument parsing =============
+    local -A args_array=([l]=logpath= [r]=failregex=)
+    local logpath
+    local failregex
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # If failregex is provided, Build a config file on-the-fly using $logpath and $failregex
+    if [[ -n "${failregex:-}" ]]; then
+        test -n "$logpath" || ynh_die "ynh_config_add_fail2ban expects a logfile path as first argument and received nothing."
+
+        echo "
+[__APP__]
+enabled = true
+port = http,https
+filter = __APP__
+logpath = __LOGPATH__
+maxretry = 5
+" > "$YNH_APP_BASEDIR/conf/f2b_jail.conf"
+
+        echo "
+[INCLUDES]
+before = common.conf
+[Definition]
+failregex = __FAILREGEX__
+ignoreregex =
+" > "$YNH_APP_BASEDIR/conf/f2b_filter.conf"
+    fi
+
+    ynh_config_add --template="f2b_jail.conf" --destination="/etc/fail2ban/jail.d/$app.conf"
+    ynh_config_add --template="f2b_filter.conf" --destination="/etc/fail2ban/filter.d/$app.conf"
+
+    # Create the folder and logfile if they doesn't exist,
+    # as fail2ban require an existing logfile before configuration
+    local logdir=$(dirname "$logpath")
+    if [ ! -d "$logdir" ]; then
+        mkdir -p "$logdir"
+        # Make sure log folder's permissions are correct
+        chown "$app:$app" "$logdir"
+        chmod u=rwX,g=rX,o= "$logdir"
+    fi
+
+    if [ ! -f "$logpath" ]; then
+        touch "$logpath"
+        # Make sure log file's permissions are correct
+        chown "$app:$app" "$logpath"
+        chmod u=rwX,g=rX,o= "$logpath"
+    fi
+
+    ynh_systemctl --service=fail2ban --action=reload --wait_until="(Started|Reloaded) fail2ban.service" --log_path=systemd
+
+    local fail2ban_error="$(journalctl --no-hostname --unit=fail2ban | tail --lines=50 | grep "WARNING.*$app.*")"
+    if [[ -n "$fail2ban_error" ]]; then
+        ynh_print_warn "Fail2ban failed to load the jail for $app"
+        ynh_print_warn "${fail2ban_error#*WARNING}"
+    fi
+}
+
+# Remove the dedicated fail2ban config (jail and filter conf files)
+#
+# usage: ynh_config_remove_fail2ban
+ynh_config_remove_fail2ban() {
+    ynh_safe_rm "/etc/fail2ban/jail.d/$app.conf"
+    ynh_safe_rm "/etc/fail2ban/filter.d/$app.conf"
+    ynh_systemctl --service=fail2ban --action=reload
+}