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| author | Francis Lavoie <lavofr@gmail.com> | 2021-12-30 04:15:48 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-12-30 04:15:48 -0500 |
| commit | 3fe2c73dd04f7769a9d9673236cb94b79ac45659 (patch) | |
| tree | 8136fcfe82d5bf3ba4158df0f965d4c866393113 | |
| parent | 5333c3528bd2badf1676efcced322d151e3706c8 (diff) | |
caddyhttp: Fix `MatchPath` sanitizing (#4499)
This is a followup to #4407, in response to a report on the forums: https://caddy.community/t/php-fastcgi-phishing-redirection/14542
Turns out that doing `TrimRight` to remove trailing dots, _before_ cleaning the path, will cause double-dots at the end of the path to not be cleaned away as they should. We should instead remove the dots _after_ cleaning.
| -rw-r--r-- | modules/caddyhttp/matchers.go | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/modules/caddyhttp/matchers.go b/modules/caddyhttp/matchers.go index 439c407..272c924 100644 --- a/modules/caddyhttp/matchers.go +++ b/modules/caddyhttp/matchers.go @@ -325,6 +325,11 @@ func (m MatchPath) Match(r *http.Request) bool { lowerPath := strings.ToLower(unescapedPath) + // Clean the path, merges doubled slashes, etc. + // This ensures maliciously crafted requests can't bypass + // the path matcher. See #4407 + lowerPath = path.Clean(lowerPath) + // see #2917; Windows ignores trailing dots and spaces // when accessing files (sigh), potentially causing a // security risk (cry) if PHP files end up being served @@ -332,11 +337,6 @@ func (m MatchPath) Match(r *http.Request) bool { // being matched by *.php to be treated as PHP scripts lowerPath = strings.TrimRight(lowerPath, ". ") - // Clean the path, merges doubled slashes, etc. - // This ensures maliciously crafted requests can't bypass - // the path matcher. See #4407 - lowerPath = path.Clean(lowerPath) - // Cleaning may remove the trailing slash, but we want to keep it if lowerPath != "/" && strings.HasSuffix(r.URL.Path, "/") { lowerPath = lowerPath + "/" |