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cmd/nginx-auth: maintainer scripts and tailnet checking (#4460)
* cmd/nginx-auth: add maintainer scripts Signed-off-by: Xe <xe@tailscale.com> * cmd/nginx-auth: add Expected-Tailnet header and documentation Signed-off-by: Xe <xe@tailscale.com>
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Xe Iaso
GitHub
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@ -117,10 +117,32 @@ header.
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The `Tailscale-Tailnet` header can help you identify which tailnet the session
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is coming from. If you are using node sharing, this can help you make sure that
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you aren't giving administrative access to people outside your tailnet. You will
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need to be sure to check this in your application code. If you use OpenResty,
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you may be able to do more complicated access controls than you can with NGINX
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alone.
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you aren't giving administrative access to people outside your tailnet.
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### Allow Requests From Only One Tailnet
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If you want to prevent node sharing from allowing users to access a service, add
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the `Expected-Tailnet` header to your auth request:
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```nginx
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location /auth {
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# ...
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proxy_set_header Expected-Tailnet "tailscale.com";
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}
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```
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If a user from a different tailnet tries to use that service, this will return a
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generic "forbidden" error page:
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```html
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<html>
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<head><title>403 Forbidden</title></head>
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<body>
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<center><h1>403 Forbidden</h1></center>
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<hr><center>nginx/1.18.0 (Ubuntu)</center>
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</body>
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</html>
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```
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## Building
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14
cmd/nginx-auth/deb/postinst.sh
Executable file
14
cmd/nginx-auth/deb/postinst.sh
Executable file
@ -0,0 +1,14 @@
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if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
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deb-systemd-helper unmask 'tailscale.nginx-auth.socket' >/dev/null || true
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if deb-systemd-helper --quiet was-enabled 'tailscale.nginx-auth.socket'; then
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deb-systemd-helper enable 'tailscale.nginx-auth.socket' >/dev/null || true
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else
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deb-systemd-helper update-state 'tailscale.nginx-auth.socket' >/dev/null || true
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fi
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if systemctl is-active tailscale.nginx-auth.socket >/dev/null; then
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systemctl --system daemon-reload >/dev/null || true
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deb-systemd-invoke stop 'tailscale.nginx-auth.service' >/dev/null || true
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deb-systemd-invoke restart 'tailscale.nginx-auth.socket' >/dev/null || true
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fi
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fi
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19
cmd/nginx-auth/deb/postrm.sh
Executable file
19
cmd/nginx-auth/deb/postrm.sh
Executable file
@ -0,0 +1,19 @@
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#!/bin/sh
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set -e
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if [ -d /run/systemd/system ] ; then
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systemctl --system daemon-reload >/dev/null || true
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fi
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if [ -x "/usr/bin/deb-systemd-helper" ]; then
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if [ "$1" = "remove" ]; then
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deb-systemd-helper mask 'tailscale.nginx-auth.socket' >/dev/null || true
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deb-systemd-helper mask 'tailscale.nginx-auth.service' >/dev/null || true
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fi
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if [ "$1" = "purge" ]; then
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deb-systemd-helper purge 'tailscale.nginx-auth.socket' >/dev/null || true
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deb-systemd-helper unmask 'tailscale.nginx-auth.socket' >/dev/null || true
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deb-systemd-helper purge 'tailscale.nginx-auth.service' >/dev/null || true
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deb-systemd-helper unmask 'tailscale.nginx-auth.service' >/dev/null || true
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fi
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fi
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8
cmd/nginx-auth/deb/prerm.sh
Executable file
8
cmd/nginx-auth/deb/prerm.sh
Executable file
@ -0,0 +1,8 @@
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#!/bin/sh
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set -e
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if [ "$1" = "remove" ]; then
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if [ -d /run/systemd/system ]; then
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deb-systemd-invoke stop 'tailscale.nginx-auth.service' >/dev/null || true
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deb-systemd-invoke stop 'tailscale.nginx-auth.socket' >/dev/null || true
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fi
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fi
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@ -4,20 +4,28 @@ set -e
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CGO_ENABLED=0 GOARCH=amd64 GOOS=linux go build -o tailscale.nginx-auth .
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mkpkg \
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--out tailscale-nginx-auth-0.1.0-amd64.deb \
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--name=tailscale-nginx-auth \
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--version=0.1.0 \
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--type=deb\
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--arch=amd64 \
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--description="Tailscale NGINX authentication protocol handler" \
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--files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service
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VERSION=0.1.1
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mkpkg \
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--out tailscale-nginx-auth-0.1.0-amd64.rpm \
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--out=tailscale-nginx-auth-${VERSION}-amd64.deb \
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--name=tailscale-nginx-auth \
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--version=0.1.0 \
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--version=${VERSION} \
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--type=deb \
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--arch=amd64 \
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--postinst=deb/postinst.sh \
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--postrm=deb/postrm.sh \
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--prerm=deb/prerm.sh \
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--description="Tailscale NGINX authentication protocol handler" \
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--files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md
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mkpkg \
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--out=tailscale-nginx-auth-${VERSION}-amd64.rpm \
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--name=tailscale-nginx-auth \
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--version=${VERSION} \
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--type=rpm \
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--arch=amd64 \
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--postinst=rpm/postinst.sh \
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--postrm=rpm/postrm.sh \
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--prerm=rpm/prerm.sh \
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--description="Tailscale NGINX authentication protocol handler" \
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--files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service
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--files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md
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@ -17,6 +17,7 @@ import (
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"net"
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"net/http"
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"net/netip"
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"net/url"
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"os"
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"strings"
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@ -75,6 +76,12 @@ func main() {
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return
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}
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if expectedTailnet := r.Header.Get("Expected-Tailnet"); expectedTailnet != "" && expectedTailnet != tailnet {
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w.WriteHeader(http.StatusForbidden)
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log.Printf("user is part of tailnet %s, wanted: %s", tailnet, url.QueryEscape(expectedTailnet))
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return
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}
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h := w.Header()
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h.Set("Tailscale-Login", strings.Split(info.UserProfile.LoginName, "@")[0])
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h.Set("Tailscale-User", info.UserProfile.LoginName)
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0
cmd/nginx-auth/rpm/postinst.sh
Executable file
0
cmd/nginx-auth/rpm/postinst.sh
Executable file
9
cmd/nginx-auth/rpm/postrm.sh
Executable file
9
cmd/nginx-auth/rpm/postrm.sh
Executable file
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# $1 == 0 for uninstallation.
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# $1 == 1 for removing old package during upgrade.
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systemctl daemon-reload >/dev/null 2>&1 || :
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if [ $1 -ge 1 ] ; then
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# Package upgrade, not uninstall
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systemctl stop tailscale.nginx-auth.service >/dev/null 2>&1 || :
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systemctl try-restart tailscale.nginx-auth.socket >/dev/null 2>&1 || :
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fi
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9
cmd/nginx-auth/rpm/prerm.sh
Executable file
9
cmd/nginx-auth/rpm/prerm.sh
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# $1 == 0 for uninstallation.
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# $1 == 1 for removing old package during upgrade.
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if [ $1 -eq 0 ] ; then
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# Package removal, not upgrade
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systemctl --no-reload disable tailscale.nginx-auth.socket > /dev/null 2>&1 || :
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systemctl stop tailscale.nginx-auth.socket > /dev/null 2>&1 || :
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systemctl stop tailscale.nginx-auth.service > /dev/null 2>&1 || :
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fi
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