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Fix open redirect check for more cases (#25143) (#25155) 

Backport https://github.com/go-gitea/gitea/pull/25143

If redirect_to parameter has set value starting with \\example.com
redirect will be created with header Location: /\\example.com that will
redirect to example.com domain.

(cherry picked from commit a9030052a7)
This commit is contained in:
Lauris BH 2023-06-08 20:03:15 +03:00 committed by Earl Warren
parent 719dddd7b4
commit a259a928ad
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1 changed files with 2 additions and 2 deletions
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4
modules/context/context.go
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@ -197,9 +197,9 @@ func (ctx *Context) RedirectToFirst(location ...string) {
continue
}
// Unfortunately browsers consider a redirect Location with preceding "//" and "/\" as meaning redirect to "http(s)://REST_OF_PATH"
// Unfortunately browsers consider a redirect Location with preceding "//", "\\" and "/\" as meaning redirect to "http(s)://REST_OF_PATH"
// Therefore we should ignore these redirect locations to prevent open redirects
if len(loc) > 1 && loc[0] == '/' && (loc[1] == '/' || loc[1] == '\\') {
if len(loc) > 1 && (loc[0] == '/' || loc[0] == '\\') && (loc[1] == '/' || loc[1] == '\\') {
continue
}