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SSHVault Server

SSHVault Server

Zero-Knowledge encrypted sync server for the SSHVault SSH client app.
Built by Kiefer Networks.

Release License: MIT CI Issues Stars


Architecture

SSHVault uses a Zero-Knowledge architecture: the server never sees plaintext data. Clients encrypt everything locally using AES-256-GCM with Argon2id key derivation. The server stores only opaque encrypted blobs.

Key Features

  • Encrypted Blob Sync with optimistic locking and version history
  • Ed25519 JWT authentication with refresh token rotation
  • Zero-Knowledge IP privacy — no plaintext IPs stored anywhere (hashed for brute-force only)
  • Self-Hosted friendly — server cannot read vault contents
  • Admin CLI for user management and database backups

Privacy by Design

The server follows strict privacy principles:

  • No IP logging in application or audit logs
  • No plaintext IP storage in the database — brute-force protection uses SHA-256 hashed IPs
  • Device tracking records sync timestamps only, no IP addresses
  • Audit log anonymization on account deletion (30-day grace period)

Quick Start

Prerequisites

  • Go 1.26+
  • PostgreSQL 16+
  • Docker & Docker Compose (optional)
  • A reverse proxy (Traefik or Caddy) for TLS termination

Local Development

cp .env.example .env
# Edit .env with your database URL

# Generate JWT signing key
make keygen

# Start PostgreSQL (via Docker)
docker compose -f docker/docker-compose.yml up postgres -d

# Run migrations and start server
make migrate
make run

Docker Compose (Production)

cp .env.example .env
# Edit .env — set POSTGRES_PASSWORD, TRUSTED_PROXIES, etc.
# IMPORTANT: Set SERVER_ADDR=0.0.0.0:8080 for Docker (binds inside container)

Build

docker compose --env-file .env -f docker/docker-compose.yml build

Start

docker compose --env-file .env -f docker/docker-compose.yml up -d

Stop

docker compose --env-file .env -f docker/docker-compose.yml down

Restart (after config changes)

docker compose --env-file .env -f docker/docker-compose.yml up -d --force-recreate

Logs

docker compose --env-file .env -f docker/docker-compose.yml logs -f server

Update (rebuild + restart)

git pull
docker compose --env-file .env -f docker/docker-compose.yml build
docker compose --env-file .env -f docker/docker-compose.yml up -d --force-recreate

Note: SERVER_ADDR must be set to 0.0.0.0:8080 inside Docker containers. The port mapping in docker-compose.yml (127.0.0.1:8080:8080) ensures the server is only reachable via localhost on the host. A reverse proxy is required for TLS termination — see Reverse Proxy Setup below.

CLI Tool

The sshvault-cli binary is included in the Docker image and provides admin commands for user management and database backups.

Using the CLI in Docker

Run CLI commands via docker compose exec against the running server container:

# Shorthand (set once)
COMPOSE="docker compose --env-file .env -f docker/docker-compose.yml"

# User management
$COMPOSE exec server ./sshvault-cli user list
$COMPOSE exec server ./sshvault-cli user list --all        # include deleted
$COMPOSE exec server ./sshvault-cli user info user@example.com
$COMPOSE exec server ./sshvault-cli user deactivate user@example.com
$COMPOSE exec server ./sshvault-cli user activate user@example.com
$COMPOSE exec server ./sshvault-cli user delete user@example.com
$COMPOSE exec server ./sshvault-cli user delete user@example.com --hard

# Database backups (manual)
$COMPOSE exec server ./sshvault-cli backup create
$COMPOSE exec server ./sshvault-cli backup list
$COMPOSE exec server ./sshvault-cli backup restore /app/backups/sshvault_20260304_120000.sql.gz

Automatic Backups

The docker-compose.yml includes a dedicated backup service that runs sshvault-cli backup auto as a daemon. It creates compressed pg_dump backups on a configurable interval and prunes old backups automatically.

Configure via environment variables:

Variable Default Description
BACKUP_DIR /app/backups Backup storage directory
BACKUP_INTERVAL 24h Time between backups
BACKUP_RETENTION 7 Number of backups to keep

The backup service starts automatically with docker compose up -d. To check its status:

$COMPOSE logs -f backup

Local Development (without Docker)

make build-cli
./bin/sshvault-cli user list
./bin/sshvault-cli backup create -o ./backups

CLI Command Reference

User Management

Command Description
user list [--all] List users (optionally include deleted)
user info <email-or-id> Show user profile, vault, devices
user delete <email-or-id> [--hard] Soft delete (default) or permanent delete with CASCADE
user deactivate <email-or-id> Soft delete + revoke all sessions
user activate <email-or-id> Reactivate a deactivated user
user logout <email-or-id> Revoke all sessions without deactivating
user devices <email-or-id> List registered devices
user delete-device <email-or-id> <device-id> Remove a specific device
user audit <email-or-id> [-n LIMIT] Show audit log (default: last 50 entries)
user reset-vault <email-or-id> Delete user's encrypted vault and history

Database Backup

Command Description
backup create [-o DIR] Create compressed database backup + manifest
backup list List available backups
backup restore <file> [--no-reconcile] Restore database with post-restore reconciliation
backup auto Start backup daemon (reads interval from ENV)

Reverse Proxy Setup

The server does not handle TLS itself. You must place a reverse proxy in front of it. Below are production-ready configurations for Caddy, Nginx, Apache, and Traefik.

Each configuration includes optional security hardening directives (commented out). Uncomment the ones you need based on your threat model.

Option A: Caddy (Recommended)

Caddy handles TLS certificates automatically via Let's Encrypt.

Create a site config (e.g. /etc/caddy/sites/sshvault.conf):

api.example.com {
    # --- TLS Configuration ---
    # Automatic HTTPS via Let's Encrypt by default.
    # Uncomment to enforce TLS 1.3 only with strong ciphers:
    # tls you@example.com {
    #     protocols tls1.3
    #     ciphers TLS_AES_128_GCM_SHA256 TLS_AES_256_GCM_SHA384 TLS_CHACHA20_POLY1305_SHA256
    #     curves x25519 secp384r1
    # }

    # --- Security Headers ---
    # Remove server identity headers to reduce information leakage:
    header {
        -Server
        -X-Powered-By
    }
    # Uncomment to add strict security headers:
    # header {
    #     # Forces HTTPS for 2 years, including subdomains; submits to browser preload list:
    #     Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
    #     # Prevents MIME-type sniffing, which can lead to XSS via content-type confusion:
    #     X-Content-Type-Options "nosniff"
    #     # Blocks the page from being embedded in iframes, preventing clickjacking attacks:
    #     X-Frame-Options "DENY"
    #     # Controls how much referrer info is sent with requests to other origins:
    #     Referrer-Policy "strict-origin-when-cross-origin"
    #     # Disables browser features (camera, mic, geolocation) that this API does not need:
    #     Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=()"
    #     # Disables the legacy XSS filter (modern browsers handle this natively):
    #     X-XSS-Protection "0"
    #     # Prevents the page from being paired with cross-origin popups (isolation):
    #     Cross-Origin-Opener-Policy "same-origin"
    #     # Restricts which origins can load this resource (same-origin only):
    #     Cross-Origin-Resource-Policy "same-origin"
    # }

    # --- Request Size Limit ---
    # Limits the maximum request body size to prevent abuse:
    request_body {
        max_size 10MB
    }

    # --- Route Filtering ---
    # Only proxy known API paths; redirect everything else to the app:
    @api_paths {
        path /health /ready /docs /docs/* /favicon.ico /v1/*
    }
    @not_api {
        not path /health /ready /docs /docs/* /favicon.ico /v1/*
    }
    redir @not_api https://your-app-domain.com{uri} permanent

    # --- Reverse Proxy ---
    # Forwards requests to the SSHVault API server running on localhost:
    reverse_proxy @api_paths 127.0.0.1:8080 {
        # Passes the real client IP to the backend for rate limiting:
        header_up X-Real-IP {remote_host}
        header_up Host {host}

        # Uncomment to set upstream timeouts (prevents hanging connections):
        # transport http {
        #     read_timeout 10s
        #     write_timeout 15s
        #     dial_timeout 5s
        # }
    }

    # --- Logging ---
    # Writes access logs in JSON format with automatic rotation:
    log {
        output file /var/log/caddy/sshvault_api.log {
            roll_size 100MiB
            roll_keep 10
        }
        format json
    }
}
sudo systemctl enable --now caddy

Set in .env:

TRUSTED_PROXIES=127.0.0.1/8,::1/128
API_BASE_URL=https://api.example.com

Option B: Nginx

server {
    listen 443 ssl http2;
    server_name api.example.com;

    # --- TLS Configuration ---
    # Paths to your SSL certificate and private key (e.g. from Let's Encrypt):
    ssl_certificate     /etc/letsencrypt/live/api.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.example.com/privkey.pem;

    # Uncomment to enforce TLS 1.2+ with strong ciphers only:
    # ssl_protocols TLSv1.2 TLSv1.3;
    # ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305;
    # ssl_prefer_server_ciphers on;
    # Uncomment to enable OCSP stapling (validates certificate status without client lookup):
    # ssl_stapling on;
    # ssl_stapling_verify on;

    # --- Security Headers ---
    # Uncomment to add strict security headers:
    # # Forces HTTPS for 2 years, including subdomains; submits to browser preload list:
    # add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    # # Prevents MIME-type sniffing, which can lead to XSS via content-type confusion:
    # add_header X-Content-Type-Options "nosniff" always;
    # # Blocks the page from being embedded in iframes, preventing clickjacking attacks:
    # add_header X-Frame-Options "DENY" always;
    # # Controls how much referrer info is sent with requests to other origins:
    # add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    # # Disables browser features (camera, mic, geolocation) that this API does not need:
    # add_header Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=()" always;
    # # Prevents the page from being paired with cross-origin popups (isolation):
    # add_header Cross-Origin-Opener-Policy "same-origin" always;
    # # Restricts which origins can load this resource (same-origin only):
    # add_header Cross-Origin-Resource-Policy "same-origin" always;

    # Hides the Nginx version from response headers to reduce information leakage:
    server_tokens off;

    # --- Request Size Limit ---
    # Limits the maximum request body size to prevent abuse:
    client_max_body_size 10M;

    # --- Reverse Proxy ---
    location / {
        # Forwards requests to the SSHVault API server running on localhost:
        proxy_pass http://127.0.0.1:8080;
        # Passes the real client IP to the backend for rate limiting:
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $host;

        # Uncomment to set upstream timeouts (prevents hanging connections):
        # proxy_connect_timeout 5s;
        # proxy_read_timeout 10s;
        # proxy_send_timeout 15s;
    }

    # --- Logging ---
    access_log /var/log/nginx/sshvault_api_access.log;
    error_log  /var/log/nginx/sshvault_api_error.log;
}

# --- HTTP to HTTPS Redirect ---
# Redirects all plain HTTP traffic to HTTPS:
server {
    listen 80;
    server_name api.example.com;
    return 301 https://$host$request_uri;
}
sudo ln -s /etc/nginx/sites-available/sshvault-api /etc/nginx/sites-enabled/
sudo nginx -t && sudo systemctl reload nginx

Set in .env:

TRUSTED_PROXIES=127.0.0.1/8,::1/128
API_BASE_URL=https://api.example.com

Option C: Apache

<VirtualHost *:443>
    ServerName api.example.com

    # --- TLS Configuration ---
    # Enable SSL and set certificate paths (e.g. from Let's Encrypt):
    SSLEngine on
    SSLCertificateFile    /etc/letsencrypt/live/api.example.com/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/live/api.example.com/privkey.pem

    # Uncomment to enforce TLS 1.2+ with strong ciphers only:
    # SSLProtocol -all +TLSv1.2 +TLSv1.3
    # SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384
    # SSLHonorCipherOrder on

    # --- Security Headers ---
    # Uncomment to add strict security headers:
    # # Forces HTTPS for 2 years, including subdomains; submits to browser preload list:
    # Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
    # # Prevents MIME-type sniffing, which can lead to XSS via content-type confusion:
    # Header always set X-Content-Type-Options "nosniff"
    # # Blocks the page from being embedded in iframes, preventing clickjacking attacks:
    # Header always set X-Frame-Options "DENY"
    # # Controls how much referrer info is sent with requests to other origins:
    # Header always set Referrer-Policy "strict-origin-when-cross-origin"
    # # Disables browser features (camera, mic, geolocation) that this API does not need:
    # Header always set Permissions-Policy "geolocation=(), microphone=(), camera=(), payment=(), usb=()"
    # # Prevents the page from being paired with cross-origin popups (isolation):
    # Header always set Cross-Origin-Opener-Policy "same-origin"
    # # Restricts which origins can load this resource (same-origin only):
    # Header always set Cross-Origin-Resource-Policy "same-origin"

    # Hides the Apache version and OS from response headers:
    ServerSignature Off
    Header always unset X-Powered-By

    # --- Request Size Limit ---
    # Limits the maximum request body size to prevent abuse (10 MB):
    LimitRequestBody 10485760

    # --- Reverse Proxy ---
    # Required modules: mod_proxy, mod_proxy_http, mod_headers
    ProxyPreserveHost On
    # Forwards requests to the SSHVault API server running on localhost:
    ProxyPass / http://127.0.0.1:8080/
    ProxyPassReverse / http://127.0.0.1:8080/

    # Passes the real client IP to the backend for rate limiting:
    RequestHeader set X-Real-IP "%{REMOTE_ADDR}e"
    RequestHeader set X-Forwarded-Proto "https"

    # Uncomment to set upstream timeouts (prevents hanging connections):
    # ProxyTimeout 10
    # Timeout 15

    # --- Logging ---
    ErrorLog  /var/log/apache2/sshvault_api_error.log
    CustomLog /var/log/apache2/sshvault_api_access.log combined
</VirtualHost>

# --- HTTP to HTTPS Redirect ---
# Redirects all plain HTTP traffic to HTTPS:
<VirtualHost *:80>
    ServerName api.example.com
    Redirect permanent / https://api.example.com/
</VirtualHost>
sudo a2enmod proxy proxy_http headers ssl
sudo a2ensite sshvault-api
sudo apachectl configtest && sudo systemctl reload apache2

Set in .env:

TRUSTED_PROXIES=127.0.0.1/8,::1/128
API_BASE_URL=https://api.example.com

Option D: Traefik

Create traefik/docker-compose.override.yml alongside the main compose file:

services:
  traefik:
    image: traefik:v3.0
    command:
      # Disable the dashboard (not needed for API-only usage):
      - "--api.dashboard=false"
      # Enable Docker provider to auto-discover services by labels:
      - "--providers.docker=true"
      # Do not expose containers by default (only labeled ones):
      - "--providers.docker.exposedbydefault=false"
      # Listen on port 80 for HTTP and port 443 for HTTPS:
      - "--entrypoints.web.address=:80"
      - "--entrypoints.websecure.address=:443"
      # Redirect all HTTP traffic to HTTPS automatically:
      - "--entrypoints.web.http.redirections.entryPoint.to=websecure"
      # Use Let's Encrypt HTTP challenge for automatic TLS certificates:
      - "--certificatesresolvers.letsencrypt.acme.httpchallenge.entrypoint=web"
      - "--certificatesresolvers.letsencrypt.acme.email=admin@example.com"
      - "--certificatesresolvers.letsencrypt.acme.storage=/letsencrypt/acme.json"
      # Uncomment to enforce TLS 1.3 only:
      # - "--entrypoints.websecure.http.tls.options=strict@file"
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - letsencrypt:/letsencrypt
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    # Uncomment to add security headers via middleware labels:
    # labels:
    #   # Forces HTTPS for 2 years, including subdomains:
    #   - "traefik.http.middlewares.security-headers.headers.stsSeconds=63072000"
    #   - "traefik.http.middlewares.security-headers.headers.stsIncludeSubdomains=true"
    #   - "traefik.http.middlewares.security-headers.headers.stsPreload=true"
    #   # Prevents MIME-type sniffing:
    #   - "traefik.http.middlewares.security-headers.headers.contentTypeNosniff=true"
    #   # Blocks embedding in iframes:
    #   - "traefik.http.middlewares.security-headers.headers.frameDeny=true"
    #   # Controls referrer info sent to other origins:
    #   - "traefik.http.middlewares.security-headers.headers.referrerPolicy=strict-origin-when-cross-origin"

  server:
    labels:
      # Enable Traefik for this container:
      - "traefik.enable=true"
      # Route requests for api.example.com to this service:
      - "traefik.http.routers.sshvault.rule=Host(`api.example.com`)"
      # Use Let's Encrypt for automatic TLS certificates:
      - "traefik.http.routers.sshvault.tls.certresolver=letsencrypt"
      # Forward traffic to port 8080 inside the container:
      - "traefik.http.services.sshvault.loadbalancer.server.port=8080"
      # Uncomment to apply the security headers middleware:
      # - "traefik.http.routers.sshvault.middlewares=security-headers"

volumes:
  letsencrypt:
docker compose -f docker/docker-compose.yml -f traefik/docker-compose.override.yml up -d

Set in .env:

TRUSTED_PROXIES=172.16.0.0/12
API_BASE_URL=https://api.example.com

Use the Docker network CIDR as trusted proxy range when Traefik runs in the same Docker network.

API

Base URL: https://api.example.com

Endpoint Method Auth Description
/health GET No Liveness check
/ready GET No Readiness check
/v1/auth/challenge GET No Get PoW challenge
/v1/auth/register POST No Register with email + password
/v1/auth/login POST No Login → access + refresh token
/v1/auth/refresh POST No Rotate tokens
/v1/auth/logout POST No Revoke refresh token
/v1/auth/logout-all POST Yes Revoke all sessions
/v1/auth/verify-email GET No Verify email via token
/v1/auth/forgot-password POST No Send password reset link
/v1/auth/reset-password POST No Reset password via token
/v1/vault GET Yes Get encrypted vault blob
/v1/vault PUT Yes Upload vault (optimistic locking)
/v1/vault/history GET Yes Version history
/v1/vault/history/{version} GET Yes Retrieve historical version
/v1/user GET/PUT/DELETE Yes User profile management
/v1/user/password PUT Yes Change password
/v1/devices GET/POST Yes List / register devices
/v1/devices/{id} DELETE Yes Remove device
/v1/user/avatar PUT Yes Update avatar (base64, max 512 KB)
/v1/user/avatar DELETE Yes Delete avatar
/v1/audit GET Yes User activity log
/v1/attestation GET No Server attestation (Ed25519 signed)
/v1/attestation/pubkey GET No Attestation public key (for TOFU pinning)

Full OpenAPI spec: api/openapi.yaml

Configuration

See .env.example for all configuration options.

Key environment variables:

Variable Required Default Description
Server
DATABASE_URL Yes PostgreSQL connection string
POSTGRES_PASSWORD Yes PostgreSQL password (Docker Compose)
HOST_PORT No 127.0.0.1:8080 Host-side port mapping for Docker Compose
SERVER_ADDR No 127.0.0.1:8080 Bind address (0.0.0.0:8080 for Docker)
SERVER_ENV No production production or development
SERVER_ID No sshvault-primary Server identity for attestation
APP_BASE_URL No https://app.example.com Frontend URL (for emails, redirects)
API_BASE_URL No https://api.example.com Public API URL
TRUSTED_PROXIES No 127.0.0.1/8,::1/128 CIDR ranges of trusted reverse proxies
CORS_ORIGINS No Comma-separated allowed origins
Auth
JWT_PRIVATE_KEY_PATH No ./keys/ed25519.pem Path to Ed25519 PEM key (auto-generated)
JWT_ACCESS_TTL No 15m Access token lifetime
JWT_REFRESH_TTL No 720h Refresh token lifetime
Mail
SMTP_HOST No Enables email sending when set
SMTP_PORT No 587 SMTP port
SMTP_USER No SMTP username
SMTP_PASS No SMTP password
SMTP_FROM No noreply@example.com Sender address
Vault
VAULT_MAX_SIZE_MB No 50 Maximum vault blob size (MB)
VAULT_HISTORY_LIMIT No 10 Maximum stored vault versions
Rate Limiting
RATE_LIMIT_RPS No 10 Requests per second (global)
RATE_LIMIT_BURST No 20 Burst capacity
Backup
BACKUP_DIR No ./backups Backup directory path
BACKUP_INTERVAL No 24h Auto-backup interval
BACKUP_RETENTION No 7 Number of backups to keep
Logging
LOG_FILE_PATH No Log file path (empty = stdout only)
LOG_MAX_SIZE_MB No 100 Max log file size before rotation
LOG_MAX_AGE_DAYS No 90 Max log file age
LOG_MAX_BACKUPS No 10 Number of rotated log files to keep
LOG_COMPRESS No true Compress rotated log files
Audit
AUDIT_RETENTION_DAYS No 365 Audit log retention period
AUDIT_BUFFER_SIZE No 4096 Audit event buffer size

Self-Hosted

For self-hosted instances:

  • Leave SMTP_HOST empty → emails logged to stdout
  • All data remains encrypted — the server cannot read vault contents
  • Set TRUSTED_PROXIES to match your reverse proxy's IP/network
  • Never expose port 8080 directly to the internet — always use a reverse proxy with TLS

Security

Zero-Knowledge Privacy

  • No plaintext IPs stored in the database or log files
  • Brute-force protection uses SHA-256 hashed IPs (irreversible)
  • Device sync tracking stores timestamps only, no network metadata
  • Audit logs contain no IP addresses
  • All vault data is encrypted client-side — server stores only opaque blobs

Server Hardening

  • Binds to 127.0.0.1:8080 by default (not reachable from outside)
  • Trusted proxy validation — X-Forwarded-For only accepted from configured CIDRs
  • Aggressive timeouts: 2s header read, 5s body read, 10s write, 30s idle
  • Request body limited to 10 MB, headers limited to 1 MB
  • Docker containers: read_only, no-new-privileges, non-root user
  • PostgreSQL port not exposed to host

Cryptography

  • Passwords: Argon2id (64 MB, 3 iterations, parallelism 4)
  • JWT: Ed25519 signatures (no shared HMAC secrets)
  • Refresh tokens: SHA-256 hashed in database

Protection

  • Rate limiting: 10 req/s global, 5 req/min on auth endpoints
  • Brute force protection: account lockout after 5 failures, IP block after 20
  • All queries parameterized (no SQL injection)
  • Soft delete + 30-day purge for account deletion

HTTP Headers

  • Strict-Transport-Security with 2-year max-age and preload
  • Content-Security-Policy: default-src 'none'
  • Cross-Origin-Opener-Policy: same-origin
  • Cross-Origin-Embedder-Policy: require-corp
  • Cross-Origin-Resource-Policy: same-origin
  • Referrer-Policy: no-referrer
  • Cache-Control: no-store
  • Permissions-Policy disables camera, microphone, geolocation, Topics API

Related

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License

Copyright (C) 2024-2026 Kiefer Networks

This project is licensed under the MIT License.

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