Cette traduction fournie par StrongLoop / IBM.

Il se peut que ce document soit obsolète par rapport à la documentation en anglais. Pour connaître les mises à jour les plus récentes, reportez-vous à la documentation en anglais.

✖

Serveurs proxy derrière Express

When running an Express app behind a reverse proxy, some of the Express APIs may return different values than expected. In order to adjust for this, the trust proxy application setting may be used to expose information provided by the reverse proxy in the Express APIs. The most common issue is express APIs that expose the client’s IP address may instead show an internal IP address of the reverse proxy.

When configuring the trust proxy setting, it is important to understand the exact setup of the reverse proxy. Since this setting will trust values provided in the request, it is important that the combination of the setting in Express matches how the reverse proxy operates.

The application setting trust proxy may be set to one of the values listed in the following table.

TypeValeur
Booléen

Si la valeur est true, l’adresse IP du client est interprétée comme étant l’entrée la plus à gauche dans l’en-tête X-Forwarded-*.

Si la valeur est false, l’application est interprétée comme étant directement accessible sur Internet et l’adresse IP du client est dérivée de req.connection.remoteAddress. Il s’agit du paramètre par défaut.

When setting to true, it is important to ensure that the last reverse proxy trusted is removing/overwriting all of the following HTTP headers: X-Forwarded-For, X-Forwarded-Host, and X-Forwarded-Proto, otherwise it may be possible for the client to provide any value.
IP addresses

An IP address, subnet, or an array of IP addresses and subnets to trust as being a reverse proxy. The following list shows the pre-configured subnet names:

  • loopback - 127.0.0.1/8, ::1/128
  • linklocal - 169.254.0.0/16, fe80::/10
  • uniquelocal - 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, fc00::/7

Vous pouvez définir les adresses IP de l’une des manières suivantes :

app.set('trust proxy', 'loopback') // specify a single subnet
app.set('trust proxy', 'loopback, 123.123.123.123') // specify a subnet and an address
app.set('trust proxy', 'loopback, linklocal, uniquelocal') // specify multiple subnets as CSV
app.set('trust proxy', ['loopback', 'linklocal', 'uniquelocal']) // specify multiple subnets as an array

S’ils sont spécifiés, les sous-réseaux ou les adresses IP sont exclus du processus d’identification d’adresse, et l’adresse IP sans confiance la plus proche du serveur d’applications est identifiée comme étant l’adresse IP du client. This works by checking if req.socket.remoteAddress is trusted. If so, then each address in X-Forwarded-For is checked from right to left until the first non-trusted address.
Numérique

Use the address that is at most n number of hops away from the Express application. req.socket.remoteAddress is the first hop, and the rest are looked for in the X-Forwarded-For header from right to left. A value of 0 means that the first untrusted address would be req.socket.remoteAddress, i.e. there is no reverse proxy.

When using this setting, it is important to ensure there are not multiple, different-length paths to the Express application such that the client can be less than the configured number of hops away, otherwise it may be possible for the client to provide any value.
Function

Custom trust implementation.

app.set('trust proxy', (ip) => {
  if (ip === '127.0.0.1' || ip === '123.123.123.123') return true // trusted IPs
  else return false
})

Enabling trust proxy will have the following impact:

Le paramètre trust proxy est implémenté à l’aide du package proxy-addr. Pour plus d’informations, consultez la documentation associée.

Edit this page