PAM changes for supporting duo 2FA solution

Multi-Factor Authentication (MFA) for sshd+PAM
https://duo.com/product/multi-factor-authentication-mfa

Related-Prod: PROD-24422
Change-Id: Iddec5a5e99e7db5d7f173ad939d3fd0cac1cd22b

.kitchen.yml

         - source: tests/example
           dest: srv/salt/linux/files/test
 
+  - name: duo
+    provisioner:
+      pillars-from-files:
+        linux.sls: tests/pillar/system_duo.sls
+
 # vim: ft=yaml sw=2 ts=2 sts=2 tw=125

.travis.yml

   - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2017.7 SUITE=system
   - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=network
   - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=system
+  - PLATFORM=epcim/salt:saltstack-ubuntu-xenial-salt-2018.3 SUITE=duo
   # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=network
   # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2017.7 SUITE=system
   # - PLATFORM=epcim/salt:saltstack-ubuntu-bionic-salt-2018.3 SUITE=network

README.rst

                 shadow: (&(&(objectClass=person)(uidNumber=*))(unixHomeDirectory=*))
                 group:  (&(objectClass=group)(gidNumber=*))
 
+PAM duo 2FA integration
+
+.. code-block:: yaml
+
+    parameters:
+      linux:
+        system:
+          auth:
+            enabled: true
+            duo:
+              enabled: true
+              duo_host: localhost
+              duo_ikey: DUO-INTEGRATION-KEY
+              duo_skey: DUO-SECRET-KEY
+
+duo package version may be specified (optional)
+
+.. code-block:: yaml
+
+      linux:
+        system:
+          package:
+            duo-unix:
+              version: 1.10.1-0
+
 Disabled multipath (the default setup):
 
 .. code-block:: yaml

linux/files/login_duo.conf

+{%- from "linux/map.jinja" import auth with context %}
+[duo]
+ikey = {{ auth.duo.duo_ikey }}
+skey = {{ auth.duo.duo_skey }}
+host = {{ auth.duo.duo_host }}
+pushinfo = yes
+failmode = secure
+

linux/files/pam-sshd

+{%- from "linux/map.jinja" import auth with context %}
+
+# PAM configuration for the Secure Shell service
+
+{%- if auth.duo.enabled %}
+auth required /lib64/security/pam_duo.so
+account required pam_nologin.so
+
+# Standard Un*x authentication.
+#@include common-auth
+{%- else %}
+# Standard Un*x authentication.
+@include common-auth
+{%- endif %}
+
+# Disallow non-root logins when /etc/nologin exists.
+account    required     pam_nologin.so
+
+# Uncomment and edit /etc/security/access.conf if you need to set complex
+# access limits that are hard to express in sshd_config.
+# account  required     pam_access.so
+
+# Standard Un*x authorization.
+@include common-account
+
+# SELinux needs to be the first session rule.  This ensures that any
+# lingering context has been cleared.  Without this it is possible that a
+# module could execute code in the wrong domain.
+session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so close
+
+# Set the loginuid process attribute.
+session    required     pam_loginuid.so
+
+# Create a new session keyring.
+session    optional     pam_keyinit.so force revoke
+
+# Standard Un*x session setup and teardown.
+@include common-session
+
+# Print the message of the day upon successful login.
+# This includes a dynamically generated part from /run/motd.dynamic
+# and a static (admin-editable) part from /etc/motd.
+session    optional     pam_motd.so  motd=/run/motd.dynamic
+session    optional     pam_motd.so noupdate
+
+# Print the status of the user's mailbox upon successful login.
+session    optional     pam_mail.so standard noenv # [1]
+
+# Set up user limits from /etc/security/limits.conf.
+session    required     pam_limits.so
+
+
+# Read environment variables from /etc/environment and
+# /etc/security/pam_env.conf.
+session    required     pam_env.so # [1]
+# In Debian 4.0 (etch), locale-related environment variables were moved to
+# /etc/default/locale, so read that as well.
+session    required     pam_env.so user_readenv=1 envfile=/etc/default/locale
+
+# SELinux needs to intervene at login time to ensure that the process starts
+# in the proper default security context.  Only sessions which are intended
+# to run in the user's context should be run after this.
+session [success=ok ignore=ignore module_unknown=ignore default=bad]        pam_selinux.so open
+
+# Standard Un*x password updating.
+@include common-password
+

linux/map.jinja

 {% set auth = salt['grains.filter_by']({
     'Arch': {
         'enabled': false,
+        'duo': {
+            'enabled': false,
+            'duo_host': 'localhost',
+            'duo_ikey': '',
+            'duo_skey': ''
+        }
     },
     'RedHat': {
         'enabled': false,
+        'duo': {
+            'enabled': false,
+            'duo_host': 'localhost',
+            'duo_ikey': '',
+            'duo_skey': ''
+        }
     },
     'Debian': {
         'enabled': false,
+        'duo': {
+            'enabled': false,
+            'duo_host': 'localhost',
+            'duo_ikey': '',
+            'duo_skey': ''
+        }
     },
 }, grain='os_family', merge=salt['pillar.get']('linux:system:auth')) %}
 
         }
     },
 }, grain='os_family', merge=salt['pillar.get']('linux:monitoring')) %}
+

linux/system/auth.sls

 {%- from "linux/map.jinja" import auth with context %}
 
 {%- if auth.enabled %}
-  {%- set pam_modules_enable = "" %}
-  {%- set pam_modules_disable = "" %}
-  {%- if grains.os_family == 'Debian' %}
+  {%- if auth.duo.enabled %}
+include:
+  - linux.system.auth.duo
+  {%- else %}
+    {%- set pam_modules_enable = "" %}
+    {%- set pam_modules_disable = "" %}
+    {%- if grains.os_family == 'Debian' %}
 linux_auth_pam_packages:
   pkg.installed:
   - pkgs: [ 'libpam-runtime' ]
     - mode: 755
     - require:
       - pkg: linux_auth_pam_packages
-  {%- endif %}
+    {%- endif %}
 
-  {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
-    {%- if grains.os_family == 'Debian' %}
-      {%- set pam_modules_enable = pam_modules_enable + ' mkhomedir' %}
+    {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
+      {%- if grains.os_family == 'Debian' %}
+        {%- set pam_modules_enable = pam_modules_enable + ' mkhomedir' %}
 linux_auth_mkhomedir_debconf_package:
   pkg.installed:
   - pkgs: [ 'debconf-utils' ]
     - source: salt://linux/files/mkhomedir
     - template: jinja
 
+      {%- endif %}
+    {%- else %}
+      {%- if grains.os_family == 'Debian' %}
+        {%- set pam_modules_disable = pam_modules_disable + ' mkhomedir' %}
+      {%- endif %}
     {%- endif %}
-  {%- else %}
-    {%- if grains.os_family == 'Debian' %}
-      {%- set pam_modules_disable = pam_modules_disable + ' mkhomedir' %}
-    {%- endif %}
-  {%- endif %}
 
-  {%- if auth.get('ldap', {}).get('enabled', False) %}
-    {%- from "linux/map.jinja" import ldap with context %}
+    {%- if auth.get('ldap', {}).get('enabled', False) %}
+      {%- from "linux/map.jinja" import ldap with context %}
 
-    {%- if grains.os_family == 'Debian' %}
-      {%- set pam_modules_enable = pam_modules_enable + ' ldap' %}
+      {%- if grains.os_family == 'Debian' %}
+        {%- set pam_modules_enable = pam_modules_enable + ' ldap' %}
 
 linux_auth_ldap_debconf_package:
   pkg.installed:
         libpam-ldapd/enable_shadow:
           type: 'boolean'
           value: 'true'
+      {%- endif %}
+    {%- else %}
+      {%- if grains.os_family == 'Debian' %}
+        {%- set pam_modules_disable = pam_modules_disable + ' ldap' %}
+      {%- endif %}
     {%- endif %}
-  {%- else %}
-    {%- if grains.os_family == 'Debian' %}
-      {%- set pam_modules_disable = pam_modules_disable + ' ldap' %}
-    {%- endif %}
-  {%- endif %}
 
   {#- Setup PAM profiles #}
-  {%- if grains.os_family == 'Debian' %}
-    {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
+    {%- if grains.os_family == 'Debian' %}
+      {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
 linux_auth_pam_add_profiles_mkhomedir_enable:
   cmd.run:
     - name: /usr/local/bin/pam-add-profile {{ pam_modules_enable }}
       - file: linux_auth_mkhomedir_config
     - require:
       - file: linux_auth_pam_add_profile
-      {%- if auth.get('ldap', {}).get('enabled', False) %}
+        {%- if auth.get('ldap', {}).get('enabled', False) %}
       - pkg: linux_auth_ldap_packages
-      {%- endif %}
-    {%- else %}
+        {%- endif %}
+      {%- else %}
 linux_auth_pam_remove_profiles_mkhomedir:
   cmd.run:
     - name: /usr/sbin/pam-auth-update --remove {{ pam_modules_disable }}
     - onlyif: "[[ `grep -c pam_mkhomedir.so /etc/pam.d/common-session` -ne 0 ]]"
     - require:
       - pkg: linux_auth_pam_packages
-    {%- endif %}
+      {%- endif %}
 
-    {%- if auth.get('ldap', {}).get('enabled', False) %}
+      {%- if auth.get('ldap', {}).get('enabled', False) %}
 linux_auth_pam_add_profiles_ldap:
   cmd.run:
     - name: /usr/local/bin/pam-add-profile {{ pam_modules_enable }}
     - require:
       - file: linux_auth_pam_add_profile
       - pkg: linux_auth_ldap_packages
-    {%- else %}
+      {%- else %}
 linux_auth_pam_remove_profiles_ldap:
   cmd.run:
     - name: /usr/sbin/pam-auth-update --remove {{ pam_modules_disable }}
     - onlyif: "[[ `debconf-get-selections | grep libpam-runtime/profiles | grep -c ldap` -ne 0 ]]"
     - require:
       - pkg: linux_auth_pam_packages
-    {%- endif %}
+      {%- endif %}
 
-  {%- elif grains.os_family == 'RedHat' %}
-    {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
+    {%- elif grains.os_family == 'RedHat' %}
+      {%- if auth.get('mkhomedir', {}).get('enabled', False) %}
 linux_auth_config_enable_mkhomedir:
   cmd.run:
     - name: "authconfig --enablemkhomedir --update"
     - require:
-      {%- if auth.get('ldap', {}).get('enabled', False) %}
+        {%- if auth.get('ldap', {}).get('enabled', False) %}
       - pkg: linux_auth_ldap_packages
-      {%- endif %}
-    {%- else %}
+        {%- endif %}
+      {%- else %}
 linux_auth_config_disable_mkhomedir:
   cmd.run:
     - name: "authconfig --disablemkhomedir --update"
     - require:
       - pkg: linux_auth_ldap_packages
-    {%- endif %}
-    {%- if auth.get('ldap', {}).get('enabled', False) %}
+      {%- endif %}
+      {%- if auth.get('ldap', {}).get('enabled', False) %}
 linux_auth_config_enable_ldap:
   cmd.run:
     - name: "authconfig --enableldap --enableldapauth --update"
     - require:
-      {%- if auth.get('ldap', {}).get('enabled', False) %}
+        {%- if auth.get('ldap', {}).get('enabled', False) %}
       - pkg: linux_auth_ldap_packages
-      {%- endif %}
-    {%- else %}
+        {%- endif %}
+      {%- else %}
 linux_auth_config_disable_ldap:
   cmd.run:
     - name: "authconfig --disableldap --disableldapauth --update"
     - require:
       - pkg: linux_auth_ldap_packages
+      {%- endif %}
     {%- endif %}
-  {%- endif %}
 
-  {%- if auth.get('ldap', {}).get('enabled', False) %}
+    {%- if auth.get('ldap', {}).get('enabled', False) %}
 
 linux_auth_nsswitch_config_file:
   file.managed:
   - enable: true
   - name: nslcd
 
+    {%- endif %}
   {%- endif %}
-
 {%- endif %}

linux/system/auth/duo.sls

+{%- if grains['os'] == 'Ubuntu' %}
+
+package_duo:
+  pkg.installed:
+    - name: duo-unix
+
+login_duo:
+  file.managed:
+    - name: /etc/duo/login_duo.conf
+    - source: salt://linux/files/login_duo.conf
+    - template: jinja
+    - user: 'root'
+    - group: 'root'
+    - mode: '0600'
+
+
+pam_duo:
+  file.managed:
+    - name: /etc/duo/pam_duo.conf
+    - source: salt://linux/files/login_duo.conf
+    - template: jinja
+    - user: 'root'
+    - group: 'root'
+    - mode: '0600'
+
+pam-sshd_config:
+  file.managed:
+  - name: /etc/pam.d/sshd
+  - user: root
+  - group: root
+  - source: salt://linux/files/pam-sshd
+  - mode: 600
+  - template: jinja
+
+{%- endif %}
+

tests/pillar/system_duo.sls

+linux:
+  network:
+    enabled: false
+    hostname: linux
+    fqdn: linux.ci.local
+  system:
+    enabled: true
+    at:
+      enabled: false
+      user:
+        root:
+          enabled: true
+        testuser:
+          enabled: true
+    cron:
+      enabled: false
+      user:
+        root:
+          enabled: false
+    cluster: default
+    name: linux
+    domain: ci.local
+    environment: prd
+    purge_repos: true
+    directory:
+      /tmp/test:
+        makedirs: true
+    apparmor:
+      enabled: false
+    haveged:
+      enabled: true
+    prompt:
+      default: "linux.ci.local$"
+    package:
+      htop:
+        version: latest
+    repo:
+      disabled_repo:
+        source: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
+        enabled: false
+      disabled_repo_left_proxy:
+        source: "deb [arch=amd64] https://download.docker.com/linux/ubuntu xenial stable"
+        enabled: false
+        proxy:
+          enabled: true
+          https: https://127.0.5.1:443
+      saltstack:
+        source: "deb [arch=amd64] http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7/ xenial main"
+        key_url: "http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2017.7/SALTSTACK-GPG-KEY.pub"
+        architectures: amd64
+        clean_file: true
+        pinning:
+          10:
+            enabled: true
+            pin: 'release o=SaltStack'
+            priority: 50
+            package: 'libsodium18'
+          20:
+            enabled: true
+            pin: 'release o=SaltStack'
+            priority: 1100
+            package: '*'
+      apt-salt:
+        source: "deb http://apt.mirantis.com/xenial stable salt"
+        #key_url: http://apt.mirantis.com/public.gpg
+        # pub   4096R/A76882D3 2015-06-17
+        key: |
+          -----BEGIN PGP PUBLIC KEY BLOCK-----
+          Version: GnuPG v1
+
+          mQINBFWBfCIBEADf6lnsY9v4rf/x0ribkFlnHnsv1/yD+M+YgZoQxYdf6b7M4/PY
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+          9nWeMkqJTjHJCKNTYfXN4O4ag444UZPcOMq+IyiWF3/sh674zCkCm5DQ/FH8IJ8Y
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+          +z6hzwdZ+QvjPbxZUig5XuvqBhIHoRtMBJdf24ysFuf/d4uZzTC8T4rUQO+L29bt
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+          ECk+l2UCjl7zwGqJqcd1BQK+UgZwVG2UV11CrhopKU5oGL84n5DaO2n6Rv8wVdrt
+          MKvqi7EkgvZpY0IHJ7rp0Gzrv0qmwJaUFCWFogITNyijb1JVsUgDTMhAkEgEsIYy
+          jtcwJrHue5Xn8UPSLkE=
+          =SWiA
+          -----END PGP PUBLIC KEY BLOCK-----
+        architectures: amd64
+        proxy:
+          enabled: true
+      apt-salt-nightly:
+        source: "deb http://apt.mirantis.com/xenial nightly salt"
+        key_url: http://apt.mirantis.com/public.gpg
+        architectures: amd64
+        proxy:
+          enabled: false
+      apt-extra-nightly:
+        source: "deb http://apt.mirantis.com/xenial nightly extra"
+        key_url: http://apt.mirantis.com/public.gpg
+        architectures: amd64
+      duo:
+        key: |
+          -----BEGIN PGP PUBLIC KEY BLOCK-----
+          Version: GnuPG v2.0.22 (GNU/Linux)
+
+          mQGiBFIog+QRBACobW/uA1UTaWWDlAhwdQGi+KVOomTVsBA/POo/xXX24kU550o3
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+          -----END PGP PUBLIC KEY BLOCK-----
+        source: "deb [arch=amd64] http://pkg.duosecurity.com/Ubuntu xenial main"
+        architectures: amd64
+    locale:
+      en_US:
+        enabled: true
+        default: true
+      cs_CZ:
+        enabled: true
+    autoupdates:
+      enabled: true
+    sudo:
+      enabled: false
+    env:
+      BOB_VARIABLE: Alice
+      LANG: C
+      LC_ALL: C
+    login_defs:
+      PASS_MAX_DAYS:
+        value: 99
+    shell:
+      umask: '027'
+      timeout: 900
+    profile:
+      vi_flavors.sh: |
+        export PAGER=view
+        alias vi=vim
+      locales: |
+        export LANG=en_US
+        export LC_ALL=en_US.UTF-8
+    auth:
+      enabled: true
+      duo:
+        enabled: true
+        duo_host: localhost
+        duo_ikey: DUO-INTEGRATION-KEY
+        duo_skey: DUO-SECRET-KEY
+