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[sonic-host-services] Add comprehensive user management daemon (userd)
SONiC needed a centralized user management daemon that can: - Monitor CONFIG_DB for user configuration changes - Manage local system users based on SONiC configuration - Provide role-based access control with predefined groups - Handle SSH key management with proper security - Integrate with PAM for authentication policies - Support efficient change detection to minimize system calls **1. User Management Daemon (userd):** - Implemented C++ daemon using SWSS framework for CONFIG_DB integration - Added comprehensive user lifecycle management (create/update/delete/enable/disable) - Implemented role-based group assignment (administrator, operator roles) - Added SSH key management with proper file permissions and ownership - Used posix_spawn() for secure command execution without shell interpretation - Added efficient change detection using UserInfo comparison to avoid unnecessary system calls - Integrated PAM faillock configuration using Jinja2 templates **2. Build System Integration:** - Added CMakeLists.txt for C++ compilation with SWSS dependencies - Created debian packaging with proper control files and dependencies - Added systemd service configuration for userd daemon - Integrated Makefile for building and installation **3. Security Features:** - Secure password handling using system's native hashing methods - Proper file permissions for SSH keys (600) and directories (700) - Role-based group assignments with predefined security groups - PAM faillock integration for login attempt limiting - Input validation and sanitization for all user operations **4. Testing Framework:** - Added comprehensive unit tests for userd functionality - Integration tests for CONFIG_DB interaction - User lifecycle testing with proper cleanup - SSH key management testing - Role-based access control validation
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‎data/templates/faillock.conf.j2‎

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# PAM faillock configuration managed by userd
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# Do not edit manually - changes will be overwritten
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# Global settings
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dir = /var/run/faillock
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audit
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silent
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no_log_info
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{% if security_policies %}
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# Role-based security policies
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{% for role, policy in security_policies.items() %}
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{% if policy.max_login_attempts %}
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# {{ role }} role settings
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deny = {{ policy.max_login_attempts }}
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unlock_time = 900 # 15 minutes
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{% endif %}
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{% endfor %}
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{% else %}
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# Default settings when no policies are configured
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deny = 5
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unlock_time = 900
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{% endif %}
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# Additional settings
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fail_interval = 900
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root_unlock_time = 900

‎userd/Makefile‎

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# Makefile for sonic-host-userd
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.PHONY: all clean install build-cpp
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# Default target
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all: build-cpp
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# Build C++ components
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build-cpp:
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mkdir -p build
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cd build && cmake ../src && make
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# Clean build artifacts
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clean:
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rm -rf build
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# Install (called by debian packaging)
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install: build-cpp
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mkdir -p $(DESTDIR)/usr/local/bin
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cp build/userd $(DESTDIR)/usr/local/bin/userd
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chmod +x $(DESTDIR)/usr/local/bin/userd
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# For development/testing
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install-local: build-cpp
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sudo cp build/userd /usr/local/bin/userd
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sudo chmod +x /usr/local/bin/userd

‎userd/debian/changelog‎

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sonic-host-userd (1.0-1) UNRELEASED; urgency=low
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* Initial release
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-- SONiC Maintainers <maintainers@sonic.net> Mon, 11 Aug 2025 08:00:00 +0000

‎userd/debian/compat‎

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‎userd/debian/control‎

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Source: sonic-host-userd
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Maintainer: SONiC Maintainers <maintainers@sonic.net>
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Section: misc
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Priority: optional
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Standards-Version: 0.1
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Build-Depends: debhelper (>=11), cmake, g++, pkg-config, libcrypt-dev, nlohmann-json3-dev, libswsscommon-dev
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Package: sonic-host-userd
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Architecture: any
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Depends: ${shlibs:Depends}, ${misc:Depends}, sonic-host-services-data, libswsscommon
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Description: SONiC host userd binary

‎userd/debian/copyright‎

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Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
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Upstream-Name: sonic-host-userd
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Source: https://github.com/Azure/sonic-buildimage
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Files: *
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Copyright: 2025 Microsoft Corporation
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License: Apache-2.0
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License: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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.
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http://www.apache.org/licenses/LICENSE-2.0
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.
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.

‎userd/debian/install‎

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build/userd /usr/local/bin/

‎userd/debian/rules‎

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#!/usr/bin/make -f
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%:
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dh $@
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override_dh_auto_build:
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dh_auto_build
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# Build C++ components
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make build-cpp
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override_dh_auto_install:
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dh_auto_install
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# Install C++ components
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make install DESTDIR=$(CURDIR)/debian/sonic-host-userd
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override_dh_installsystemd:
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dh_installsystemd --no-start --name=sonic-host-userd
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override_dh_usrlocal:
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# Skip dh_usrlocal since we're intentionally installing to /usr/local/bin

‎userd/debian/sonic-host-userd.service‎

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[Unit]
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Description=User management daemon
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Requires=config-setup.service
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After=config-setup.service
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BindsTo=sonic.target
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After=sonic.target
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[Service]
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Type=simple
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ExecStart=/usr/local/bin/userd
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Restart=always
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RestartSec=5
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[Install]
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WantedBy=sonic.target

‎userd/src/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.10)
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project(sonic-host-userd)
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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# Include directories (SONiC standard paths)
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include_directories(/usr/include/swss)
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include_directories(/usr/include)
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# Compiler flags
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror")
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set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -g -O0")
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set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O2")
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# Add executable
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add_executable(userd userd.cpp)
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# Link libraries
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target_link_libraries(userd
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swsscommon
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pthread
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crypt
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)
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# Install target
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install(TARGETS userd
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RUNTIME DESTINATION /usr/local/bin
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)
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