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pkg/web: X-Forwarded-For multi-IP handling (#45098)

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It is conventionally common for the X-Forwarded-For header to contain a
comma-separated list of IP addresses, with each intermediate proxy
adding an additional item as a request passes through it. This change
makes the web framework handle this case appropriately, always selecting
the first item in the list.
This commit is contained in:
sam boyer 2022-02-08 14:37:19 -05:00 committed by GitHub
parent 2cf421dfe3
commit 6a2255abe7
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1 changed files with 10 additions and 6 deletions
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16
pkg/web/context.go
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@ -77,13 +77,17 @@ func (ctx *Context) run() {
// RemoteAddr returns more real IP address.
func (ctx *Context) RemoteAddr() string {
addr := ctx.Req.Header.Get("X-Real-IP")
if len(addr) == 0 {
addr = ctx.Req.Header.Get("X-Forwarded-For")
if addr == "" {
addr = ctx.Req.RemoteAddr
if i := strings.LastIndex(addr, ":"); i > -1 {
addr = addr[:i]
}
// X-Forwarded-For may contain multiple IP addresses, separated by
// commas.
addr = strings.TrimSpace(strings.Split(ctx.Req.Header.Get("X-Forwarded-For"), ",")[0])
}
if len(addr) == 0 {
addr = ctx.Req.RemoteAddr
if i := strings.LastIndex(addr, ":"); i > -1 {
addr = addr[:i]
}
}
return addr