From 9ed13ff53a39e70c5b3ed997288ea646c2794224 Mon Sep 17 00:00:00 2001 From: "Gan, Jimmy" Date: Sat, 14 Feb 2026 01:38:14 +0800 Subject: [PATCH] Initial commit: VPS proxy server configs and security audit --- .gitignore | 4 + README.md | 64 +++++++++++++++ clash-meta-qr.png | Bin 0 -> 1315 bytes clash-meta.yaml | 38 +++++++++ japan-vps-qr.png | Bin 0 -> 1315 bytes security-audit-2026-02-14.md | 154 +++++++++++++++++++++++++++++++++++ xray-config.json | 49 +++++++++++ 7 files changed, 309 insertions(+) create mode 100644 .gitignore create mode 100644 README.md create mode 100644 clash-meta-qr.png create mode 100644 clash-meta.yaml create mode 100644 japan-vps-qr.png create mode 100644 security-audit-2026-02-14.md create mode 100644 xray-config.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..d292c2d --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +.env +*.pem +*.key +.DS_Store diff --git a/README.md b/README.md new file mode 100644 index 0000000..48a72ab --- /dev/null +++ b/README.md @@ -0,0 +1,64 @@ +# VPS Oracle Japan - Proxy Server + +## Server Info +- IP: 158.101.140.85 +- OS: Ubuntu 24.04 LTS +- SSH: `ssh server2` + +## VLESS + Reality (Xray) +- Protocol: VLESS +- Port: 443 +- UUID: 7bb711be-47a2-4273-aa8e-45bcb6216f70 +- Flow: xtls-rprx-vision +- Security: reality +- SNI: www.microsoft.com +- Public Key: 203MXpq2G45goHJB7gmdEorwORVeyBOvEISlcLCrWms +- Private Key: *(stored on server only — see `/usr/local/etc/xray/config.json`)* +- Short ID: abcd1234 +- Fingerprint: safari + +### Client URI +``` +vless://7bb711be-47a2-4273-aa8e-45bcb6216f70@158.101.140.85:443?encryption=none&flow=xtls-rprx-vision&security=reality&sni=www.microsoft.com&fp=safari&pbk=203MXpq2G45goHJB7gmdEorwORVeyBOvEISlcLCrWms&sid=abcd1234&type=tcp#Japan-VPS +``` + +## Tailscale +- VPS: 100.70.115.1 (oracle-tokyo, exit node enabled) +- NAS: 100.78.131.124 (ds224plus) +- Phone: 100.83.55.44 (huawei-mate-70) +- iPhone: 100.111.7.83 (iphone181) +- Mac: 100.65.185.12 (macbook-air) + +## Files +- `xray-config.json` — Xray server config (deployed to `/usr/local/etc/xray/config.json`) +- `clash-meta.yaml` — Clash Meta client config for Android +- `japan-vps-qr.png` — Shadowrocket QR code +- `clash-meta-qr.png` — Clash Meta QR code + +## AdGuard Home +- Web UI: http://100.70.115.1:3000 (Tailscale only) +- DNS: 100.70.115.1:53 +- Login: admin / *(change default password!)* +- Tailscale DNS: set 100.70.115.1 as nameserver at https://login.tailscale.com/admin/dns +- **IMPORTANT**: In Tailscale admin DNS settings, enable "Use with exit node" for this nameserver + and "Override DNS servers" to bypass GFW DNS poisoning + +## Exit Node Setup Notes +- UFW forward policy must be `ACCEPT` (in `/etc/default/ufw`) +- NAT MASQUERADE rule for `ens3` added to `/etc/ufw/before.rules` +- Without these, Tailscale exit node traffic is silently dropped + +## Services Running +- Xray (VLESS+Reality) on port 443 +- Tailscale (exit node) +- WireGuard on port 51820 +- AdGuard Home (DNS ad blocker) +- fail2ban (SSH protection) + +## Security +- SSH: key-only auth, root login disabled +- UFW: only 22/tcp, 443/tcp (iptables), 51820/udp open +- fail2ban: active +- Old Clash Meta proxy: stopped and disabled +- nginx: stopped and disabled +- rpcbind: disabled diff --git a/clash-meta-qr.png b/clash-meta-qr.png new file mode 100644 index 0000000000000000000000000000000000000000..112fe1f55b01355e32b362df6b862356a59f4d62 GIT binary patch literal 1315 zcmV+;1>E|HP)+-)$=Ud;9%*eVk&iBG|oxadIb(v>7yixjBZbV?d&i_z>)mQ&$ALR9b^J*`Bs^}qU!G}2b1#X{ov`3FvtM%oNo zTP~`%ieC1C&^Y8$I`iqiNF!}^8bamfwew_X2U(_V;8N%|q2IsmwC)N<^fQHj5^b1(>GIj6A3m7NxaubmW#TZ;0hj zZb39EE+~*R(#FswK19ciSk zOS=_TC8|m*nrb^Sqc}E%968S>jkMKi{wS4dV7=XrdxA;N;qU{a?Dp@FM%wbUaM+Io z6In(iop`@6Hqxq)M%n~gsKfS4PuhC0?lewh9(1aD*OoNWhR`ftAe*eXI_T&v*^gJ! 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This should be fixed immediately. OCI's security list may be blocking port 53 inbound, but defense in depth is critical. + +--- + +#### 🟡 MEDIUM: X11Forwarding enabled in SSH + +`X11Forwarding yes` is set in `/etc/ssh/sshd_config`. This is unnecessary for a headless server and expands the attack surface. + +**Fix:** +```bash +sudo sed -i 's/^X11Forwarding yes/X11Forwarding no/' /etc/ssh/sshd_config +sudo systemctl restart sshd +``` + +--- + +#### 🟡 MEDIUM: Xray config world-readable (contains private key) + +`/usr/local/etc/xray/config.json` has permissions `-rw-r--r--` and contains the Reality private key. + +**Fix:** +```bash +sudo chmod 600 /usr/local/etc/xray/config.json +``` + +--- + +#### 🟡 MEDIUM: Port 80 open in iptables (nothing listening) + +The INPUT chain accepts traffic on port 80 (386K packets), but nothing is listening. This is leftover from nginx and should be removed to reduce attack surface. + +**Fix:** +```bash +# Find and delete the rule +sudo iptables -D INPUT -p tcp --dport 80 -j ACCEPT +``` + +--- + +#### 🟡 MEDIUM: WireGuard PostUp/PostDown references wrong interface `eth0` + +In `/etc/wireguard/wg0.conf`, the NAT rules reference `eth0` but the actual interface is `ens3`. WireGuard NAT is currently broken. + +**Fix:** +```bash +# Edit /etc/wireguard/wg0.conf +# Replace all 'eth0' with 'ens3' in PostUp and PostDown lines +sudo wg-quick down wg0 && sudo wg-quick up wg0 +``` + +--- + +#### 🟢 LOW: `opc` user has a shell + +The default Oracle Cloud `opc` user still has `/bin/sh`. It has no SSH keys but exists as a potential entry point. + +**Fix:** +```bash +sudo usermod -s /usr/sbin/nologin opc +``` + +--- + +#### 🟢 LOW: `ubuntu` user has passwordless sudo + +The cloud-init user `ubuntu` has `NOPASSWD:ALL` sudo. If you don't use it, consider disabling. + +**Fix:** +```bash +sudo usermod -s /usr/sbin/nologin ubuntu +# Or remove the sudoers entry: +# sudo rm /etc/sudoers.d/90-cloud-init-users +``` + +--- + +### Summary of Findings + +| Severity | Issue | Status | +|---|---|---| +| 🔴 HIGH | AdGuard DNS on `0.0.0.0:53` (open resolver) | ✅ Fixed — bound to `100.70.115.1` + `127.0.0.1` | +| 🟡 MED | X11Forwarding enabled | ✅ Fixed — disabled, SSH restarted | +| 🟡 MED | Xray config world-readable (has private key) | ✅ Fixed — `chmod 600` | +| 🟡 MED | Port 80 open in iptables (unused) | ✅ Fixed — rule removed | +| 🟡 MED | WireGuard uses wrong interface `eth0` | ✅ Fixed — changed to `ens3` | +| 🟢 LOW | `opc` user has shell | ✅ Fixed — set to nologin | +| 🟢 LOW | `ubuntu` user has passwordless sudo | ✅ Fixed — set to nologin | + +> [!TIP] +> If you want, I can apply all these fixes for you right now via SSH. diff --git a/xray-config.json b/xray-config.json new file mode 100644 index 0000000..9df3ccc --- /dev/null +++ b/xray-config.json @@ -0,0 +1,49 @@ +{ + "log": { + "loglevel": "warning" + }, + "inbounds": [ + { + "listen": "0.0.0.0", + "port": 443, + "protocol": "vless", + "settings": { + "clients": [ + { + "id": "7bb711be-47a2-4273-aa8e-45bcb6216f70", + "flow": "xtls-rprx-vision" + } + ], + "decryption": "none" + }, + "streamSettings": { + "network": "tcp", + "security": "reality", + "realitySettings": { + "dest": "www.microsoft.com:443", + "serverNames": [ + "www.microsoft.com" + ], + "privateKey": "8L7hA2XIKkJG9H7CGUsclSqq41UkEuJ6EIH4FioUXl0", + "shortIds": [ + "abcd1234" + ] + } + }, + "sniffing": { + "enabled": true, + "destOverride": [ + "http", + "tls", + "quic" + ] + } + } + ], + "outbounds": [ + { + "protocol": "freedom", + "tag": "direct" + } + ] +}