troldspejlet/forgejo
troldspejlet/forgejo
1
0
Fork 0
mirror of https://codeberg.org/forgejo/forgejo.git synced 2024-11-27 21:03:56 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

Prevent redirect to Host (2) (#19175)

Browse source 
Unhelpfully Locations starting with `/\` will be converted by the
browser to `//` because ... well I do not fully understand. Certainly
the RFCs and MDN do not indicate that this would be expected. Providing
"compatibility" with the (mis)behaviour of a certain proprietary OS is
my suspicion. However, we clearly have to protect against this.

Therefore we should reject redirection locations that match the regular
expression: `^/[\\\\/]+`

Reference #9678

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2022-03-23 16:12:36 +00:00 committed by GitHub
parent 81b5bef55a
commit 0b1686b67a
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
modules/context/context.go
View file

@ -181,6 +181,12 @@ 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"
// Therefore we should ignore these redirect locations to prevent open redirects
if len(loc) > 1 && loc[0] == '/' && (loc[1] == '/' || loc[1] == '\\') {
continue
}
u, err := url.Parse(loc)
if err != nil || ((u.Scheme != "" || u.Host != "") && !strings.HasPrefix(strings.ToLower(loc), strings.ToLower(setting.AppURL))) {
continue