mirror of
https://github.com/trailofbits/algo.git
synced 2025-09-06 20:13:11 +02:00
Merge master security enhancements into PKI refactor
This merge preserves all critical security enhancements from master while
using the modern Ansible crypto modules approach:
Security features preserved:
- Name constraints to restrict CA certificate scope
- Extended Key Usage (EKU) restrictions for server vs client certificates
- Subject Alternative Name (SAN) requirements for certificate validation
- Password-protected CA private keys
- Certificate Revocation List (CRL) generation
- Proper file permissions and directory structure
The refactored approach eliminates shell commands and uses Ansible's
community.crypto modules for better security and maintainability.
🚨 Security-critical merge - all defensive measures retained
Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Dan Guido
commit
b9cb08a980
9 changed files with 233 additions and 11 deletions
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@ -1,5 +1,5 @@
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---
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- name: daemon reload
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- name: daemon-reload
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systemd:
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daemon_reload: true
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@ -62,3 +62,38 @@
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AmbientCapabilities=CAP_NET_BIND_SERVICE
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notify:
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- restart dnscrypt-proxy
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- name: Ubuntu | Apply systemd security hardening for dnscrypt-proxy
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copy:
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dest: /etc/systemd/system/dnscrypt-proxy.service.d/90-security-hardening.conf
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content: |
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# Algo VPN systemd security hardening for dnscrypt-proxy
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# Additional hardening on top of comprehensive AppArmor
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[Service]
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# Privilege restrictions
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NoNewPrivileges=yes
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# Filesystem isolation (complements AppArmor)
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ProtectSystem=strict
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ProtectHome=yes
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PrivateTmp=yes
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PrivateDevices=yes
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ProtectKernelTunables=yes
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ProtectControlGroups=yes
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# Network restrictions
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RestrictAddressFamilies=AF_INET AF_INET6
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# Allow access to dnscrypt-proxy cache (AppArmor also controls this)
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ReadWritePaths=/var/cache/dnscrypt-proxy
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# System call filtering (complements AppArmor restrictions)
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SystemCallFilter=@system-service @network-io
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SystemCallFilter=~@debug @mount @swap @reboot @raw-io
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SystemCallErrorNumber=EPERM
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owner: root
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group: root
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mode: 0644
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notify:
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- daemon-reload
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- restart dnscrypt-proxy
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@ -11,7 +11,12 @@ algo_ondemand_wifi_exclude: _null
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algo_dns_adblocking: false
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ipv6_support: false
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dns_encryption: true
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# Random UUID for CA name constraints - prevents certificate reuse across different Algo deployments
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# This unique identifier ensures each CA can only issue certificates for its specific server instance
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openssl_constraint_random_id: "{{ IP_subject_alt_name | to_uuid }}.algo"
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# Subject Alternative Name (SAN) configuration - CRITICAL for client compatibility
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# Modern clients (especially macOS/iOS) REQUIRE SAN extension in server certificates
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# Without SAN, IKEv2 connections will fail with certificate validation errors
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subjectAltName_type: "{{ 'DNS' if IP_subject_alt_name|regex_search('[a-z]') else 'IP' }}"
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subjectAltName: >-
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{{ subjectAltName_type }}:{{ IP_subject_alt_name }}
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@ -21,12 +26,16 @@ nameConstraints: >-
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critical,permitted;{{ subjectAltName_type }}:{{ IP_subject_alt_name }}{{- '/255.255.255.255' if subjectAltName_type == 'IP' else '' -}}
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{%- if subjectAltName_type == 'IP' -%}
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,permitted;DNS:{{ openssl_constraint_random_id }}
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,excluded;DNS:.com,excluded;DNS:.org,excluded;DNS:.net,excluded;DNS:.gov,excluded;DNS:.edu,excluded;DNS:.mil,excluded;DNS:.int
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,excluded;IP:10.0.0.0/255.0.0.0,excluded;IP:172.16.0.0/255.240.0.0,excluded;IP:192.168.0.0/255.255.0.0
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{%- else -%}
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,excluded;IP:0.0.0.0/0.0.0.0
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{%- endif -%}
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,permitted;email:{{ openssl_constraint_random_id }}
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,excluded;email:.com,excluded;email:.org,excluded;email:.net,excluded;email:.gov,excluded;email:.edu,excluded;email:.mil,excluded;email:.int
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{%- if ipv6_support -%}
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,permitted;IP:{{ ansible_default_ipv6['address'] }}/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
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,excluded;IP:fc00:0:0:0:0:0:0:0/fe00:0:0:0:0:0:0:0,excluded;IP:fe80:0:0:0:0:0:0:0/ffc0:0:0:0:0:0:0:0,excluded;IP:2001:db8:0:0:0:0:0:0/ffff:fff8:0:0:0:0:0:0
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{%- else -%}
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,excluded;IP:0:0:0:0:0:0:0:0/0:0:0:0:0:0:0:0
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{%- endif -%}
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@ -33,6 +33,7 @@
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with_items:
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- "{{ users }}"
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- name: Build the client ipsec secret file
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template:
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src: client_ipsec.secrets.j2
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@ -13,15 +13,18 @@
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dest: "{{ ipsec_pki_path }}/{{ item }}"
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state: directory
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recurse: true
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mode: "0700"
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with_items:
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- certs
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- private
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- public
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- name: Ensure the config directories exist
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file:
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dest: "{{ ipsec_config_path }}/{{ item }}"
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state: directory
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recurse: true
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mode: "0700"
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with_items:
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- apple
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- manual
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@ -34,7 +37,10 @@
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curve: secp384r1
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mode: "0600"
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- name: Create certificate signing request (CSR) for CA certificate
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# CRITICAL: Create CA certificate with proper security constraints
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# Name constraints provide defense-in-depth security by restricting the scope of certificates
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# this CA can issue, preventing misuse if the CA key is compromised
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- name: Create certificate signing request (CSR) for CA certificate with security constraints
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community.crypto.openssl_csr_pipe:
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privatekey_path: "{{ ipsec_pki_path }}/private/cakey.pem"
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privatekey_passphrase: "{{ CA_password }}"
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@ -42,10 +48,35 @@
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use_common_name_for_san: true
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basic_constraints:
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- 'CA:TRUE'
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- 'pathlen:0'
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basic_constraints_critical: true
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key_usage:
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- keyCertSign
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- cRLSign
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key_usage_critical: true
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# Restrict CA to only sign VPN-related certificates
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extended_key_usage:
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- serverAuth
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- clientAuth
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- '1.3.6.1.5.5.7.3.17' # IPsec End Entity
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extended_key_usage_critical: true
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# Name constraints to restrict certificate scope
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name_constraints_permitted:
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- "{{ subjectAltName_type }}:{{ IP_subject_alt_name }}{{ '/255.255.255.255' if subjectAltName_type == 'IP' else '' }}"
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- "DNS:{{ openssl_constraint_random_id }}"
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- "email:{{ openssl_constraint_random_id }}"
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name_constraints_excluded:
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- "DNS:.com"
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- "DNS:.org"
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- "DNS:.net"
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- "DNS:.gov"
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- "DNS:.edu"
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- "DNS:.mil"
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- "DNS:.int"
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- "IP:10.0.0.0/255.0.0.0"
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- "IP:172.16.0.0/255.240.0.0"
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- "IP:192.168.0.0/255.255.0.0"
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name_constraints_critical: true
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register: ca_csr
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- name: Create self-signed CA certificate from CSR
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@ -55,8 +86,14 @@
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privatekey_path: "{{ ipsec_pki_path }}/private/cakey.pem"
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privatekey_passphrase: "{{ CA_password }}"
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provider: selfsigned
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mode: "0644"
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- name: Create private keys
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- name: Copy the CA certificate
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copy:
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src: "{{ ipsec_pki_path }}/cacert.pem"
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dest: "{{ ipsec_config_path }}/manual/cacert.pem"
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- name: Create private keys for users and server
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community.crypto.openssl_privatekey:
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path: "{{ ipsec_pki_path }}/private/{{ item }}.key"
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type: ECC
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@ -67,17 +104,59 @@
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- "{{ IP_subject_alt_name }}"
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register: client_key_jobs
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- name: Create CSRs
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# Create CSRs with proper Subject Alternative Names
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# CRITICAL: Server certificates need SAN extension for modern clients,
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# especially macOS/iOS which perform strict certificate validation for IKEv2.
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# Without SAN containing the server IP, clients will reject the certificate.
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- name: Create CSRs for server certificate with SAN
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community.crypto.openssl_csr_pipe:
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privatekey_path: "{{ ipsec_pki_path }}/private/{{ IP_subject_alt_name }}.key"
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subject_alt_name: "{{ subjectAltName.split(',') }}"
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common_name: "{{ IP_subject_alt_name }}"
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key_usage:
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- digitalSignature
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- keyEncipherment
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key_usage_critical: false
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# Server authentication for IKEv2 VPN connections
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extended_key_usage:
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- serverAuth
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- '1.3.6.1.5.5.7.3.17' # IPsec End Entity
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extended_key_usage_critical: false
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register: server_csr
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- name: Create CSRs for client certificates
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community.crypto.openssl_csr_pipe:
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privatekey_path: "{{ ipsec_pki_path }}/private/{{ item }}.key"
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subject_alt_name: "{{ subjectAltName | split(',') if item == IP_subject_alt_name else [subjectAltName_USER] }}"
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subject_alt_name:
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- "email:{{ item }}@{{ openssl_constraint_random_id }}"
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common_name: "{{ item }}"
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with_items:
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- "{{ users }}"
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- "{{ IP_subject_alt_name }}"
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key_usage:
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- digitalSignature
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- keyEncipherment
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key_usage_critical: false
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# Client certificates should not have serverAuth
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extended_key_usage:
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- clientAuth
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- '1.3.6.1.5.5.7.3.17' # IPsec End Entity
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extended_key_usage_critical: false
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with_items: "{{ users }}"
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register: client_csr_jobs
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- name: Sign clients certificates with our CA
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# Sign server certificate with proper extensions
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- name: Sign server certificate with CA
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community.crypto.x509_certificate:
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csr_content: "{{ server_csr.csr }}"
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path: "{{ ipsec_pki_path }}/certs/{{ IP_subject_alt_name }}.crt"
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provider: ownca
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ownca_path: "{{ ipsec_pki_path }}/cacert.pem"
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ownca_privatekey_path: "{{ ipsec_pki_path }}/private/cakey.pem"
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ownca_privatekey_passphrase: "{{ CA_password }}"
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ownca_not_after: +3650d
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ownca_not_before: "-1d"
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mode: "0644"
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# Sign client certificates with CA
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- name: Sign client certificates with CA
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community.crypto.x509_certificate:
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csr_content: "{{ item.csr }}"
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path: "{{ ipsec_pki_path }}/certs/{{ item.item }}.crt"
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@ -87,6 +166,7 @@
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ownca_privatekey_passphrase: "{{ CA_password }}"
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ownca_not_after: +3650d
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ownca_not_before: "-1d"
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mode: "0644"
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with_items: "{{ client_csr_jobs.results }}"
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register: client_sign_results
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@ -101,6 +181,19 @@
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encryption_level: "compatibility2022"
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with_items: "{{ users }}"
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- name: Generate p12 files with CA certificate included
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community.crypto.openssl_pkcs12:
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path: "{{ ipsec_pki_path }}/private/{{ item }}_ca.p12"
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friendly_name: "{{ item }}"
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privatekey_path: "{{ ipsec_pki_path }}/private/{{ item }}.key"
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certificate_path: "{{ ipsec_pki_path }}/certs/{{ item }}.crt"
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other_certificates:
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- "{{ ipsec_pki_path }}/cacert.pem"
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passphrase: "{{ p12_export_password }}"
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mode: "0600"
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encryption_level: "compatibility2022"
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with_items: "{{ users }}"
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- name: Copy the p12 certificates
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copy:
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src: "{{ ipsec_pki_path }}/private/{{ item }}.p12"
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@ -108,6 +201,13 @@
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with_items:
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- "{{ users }}"
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- name: Build openssh public keys
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community.crypto.openssl_publickey:
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path: "{{ ipsec_pki_path }}/public/{{ item }}.pub"
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privatekey_path: "{{ ipsec_pki_path }}/private/{{ item }}.key"
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format: OpenSSH
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with_items: "{{ users }}"
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- name: Add all users to the file
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ansible.builtin.lineinfile:
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path: "{{ ipsec_pki_path }}/all-users"
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@ -142,6 +242,7 @@
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issuer:
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CN: "{{ IP_subject_alt_name }}"
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revoked_certificates: "{{ revoked_certificates }}"
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mode: "0644"
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delegate_to: localhost
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become: false
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vars:
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|
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@ -1,2 +1,24 @@
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# Algo VPN systemd security hardening for StrongSwan
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# Enhanced hardening on top of existing AppArmor
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[Service]
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MemoryLimit=16777216
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# Privilege restrictions
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NoNewPrivileges=yes
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# Filesystem isolation (complements AppArmor)
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ProtectHome=yes
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PrivateTmp=yes
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ProtectKernelTunables=yes
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ProtectControlGroups=yes
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# Network restrictions - include IPsec kernel communication requirements
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RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_PACKET
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# Allow access to IPsec configuration, state, and kernel interfaces
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ReadWritePaths=/etc/ipsec.d /var/lib/strongswan
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ReadOnlyPaths=/proc/net/pfkey
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# System call filtering (complements AppArmor restrictions)
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# Allow crypto operations, remove cpu-emulation restriction for crypto algorithms
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SystemCallFilter=@system-service @network-io
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SystemCallFilter=~@debug @mount @swap @reboot
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SystemCallErrorNumber=EPERM
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|
|
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@ -73,10 +73,13 @@
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</dict>
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<key>DeadPeerDetectionRate</key>
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<string>Medium</string>
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<!-- MOBIKE allows VPN to survive network changes (WiFi to cellular) -->
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<key>DisableMOBIKE</key>
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<integer>0</integer>
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||||
<!-- Disable IKEv2 redirects for security -->
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<key>DisableRedirect</key>
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<integer>1</integer>
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<!-- Disable CRL checking for performance and reliability -->
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<key>EnableCertificateRevocationCheck</key>
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<integer>0</integer>
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<key>EnablePFS</key>
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@ -96,19 +99,24 @@
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|||
<string>{{ item.0 }}@{{ openssl_constraint_random_id }}</string>
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<key>PayloadCertificateUUID</key>
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<string>{{ pkcs12_PayloadCertificateUUID }}</string>
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<!-- Use ECDSA P-384 certificates for strong security -->
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<key>CertificateType</key>
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<string>ECDSA384</string>
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<key>ServerCertificateIssuerCommonName</key>
|
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<string>{{ IP_subject_alt_name }}</string>
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<key>ServerCertificateCommonName</key>
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<string>{{ IP_subject_alt_name }}</string>
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<key>RemoteAddress</key>
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||||
<string>{{ IP_subject_alt_name }}</string>
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||||
<key>RemoteIdentifier</key>
|
||||
<string>{{ IP_subject_alt_name }}</string>
|
||||
<!-- Use server-provided internal IP assignment -->
|
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<key>UseConfigurationAttributeInternalIPSubnet</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>IPv4</key>
|
||||
<dict>
|
||||
<!-- Override primary network interface for full VPN routing -->
|
||||
<key>OverridePrimary</key>
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||||
<integer>1</integer>
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||||
</dict>
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||||
|
|
|
|||
|
|
@ -1,4 +1,8 @@
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|||
---
|
||||
- name: daemon-reload
|
||||
systemd:
|
||||
daemon_reload: true
|
||||
|
||||
- name: restart wireguard
|
||||
service:
|
||||
name: "{{ service_name }}"
|
||||
|
|
|
|||
|
|
@ -10,3 +10,45 @@
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|||
set_fact:
|
||||
service_name: wg-quick@{{ wireguard_interface }}
|
||||
tags: always
|
||||
|
||||
- name: Ubuntu | Ensure that the WireGuard service directory exists
|
||||
file:
|
||||
path: /etc/systemd/system/wg-quick@{{ wireguard_interface }}.service.d/
|
||||
state: directory
|
||||
mode: 0755
|
||||
owner: root
|
||||
group: root
|
||||
|
||||
- name: Ubuntu | Apply systemd security hardening for WireGuard
|
||||
copy:
|
||||
dest: /etc/systemd/system/wg-quick@{{ wireguard_interface }}.service.d/90-security-hardening.conf
|
||||
content: |
|
||||
# Algo VPN systemd security hardening for WireGuard
|
||||
[Service]
|
||||
# Privilege restrictions
|
||||
NoNewPrivileges=yes
|
||||
|
||||
# Filesystem isolation
|
||||
ProtectSystem=strict
|
||||
ProtectHome=yes
|
||||
PrivateTmp=yes
|
||||
ProtectKernelTunables=yes
|
||||
ProtectControlGroups=yes
|
||||
|
||||
# Network restrictions - WireGuard needs NETLINK for interface management
|
||||
RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK
|
||||
|
||||
# Allow access to WireGuard configuration
|
||||
ReadWritePaths=/etc/wireguard
|
||||
ReadOnlyPaths=/etc/resolv.conf
|
||||
|
||||
# System call filtering - allow network and system service calls
|
||||
SystemCallFilter=@system-service @network-io
|
||||
SystemCallFilter=~@debug @mount @swap @reboot @raw-io
|
||||
SystemCallErrorNumber=EPERM
|
||||
owner: root
|
||||
group: root
|
||||
mode: 0644
|
||||
notify:
|
||||
- daemon-reload
|
||||
- restart wireguard
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue