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-rw-r--r--modules/caddyhttp/caddyhttp.go35
-rw-r--r--modules/caddyhttp/caddyhttp_test.go57
-rw-r--r--modules/caddyhttp/fileserver/staticfiles.go12
-rw-r--r--modules/caddyhttp/matchers.go318
-rw-r--r--modules/caddyhttp/matchers_test.go153
-rw-r--r--modules/caddyhttp/rewrite/rewrite.go110
-rw-r--r--modules/caddyhttp/rewrite/rewrite_test.go41
7 files changed, 614 insertions, 112 deletions
diff --git a/modules/caddyhttp/caddyhttp.go b/modules/caddyhttp/caddyhttp.go
index 784b2b9..c9cc9e6 100644
--- a/modules/caddyhttp/caddyhttp.go
+++ b/modules/caddyhttp/caddyhttp.go
@@ -20,6 +20,7 @@ import (
"io"
"net"
"net/http"
+ "path"
"path/filepath"
"strconv"
"strings"
@@ -244,6 +245,40 @@ func SanitizedPathJoin(root, reqPath string) string {
return path
}
+// CleanPath cleans path p according to path.Clean(), but only
+// merges repeated slashes if collapseSlashes is true, and always
+// preserves trailing slashes.
+func CleanPath(p string, collapseSlashes bool) string {
+ if collapseSlashes {
+ return cleanPath(p)
+ }
+
+ // insert an invalid/impossible URI character into each two consecutive
+ // slashes to expand empty path segments; then clean the path as usual,
+ // and then remove the remaining temporary characters.
+ const tmpCh = 0xff
+ var sb strings.Builder
+ for i, ch := range p {
+ if ch == '/' && i > 0 && p[i-1] == '/' {
+ sb.WriteByte(tmpCh)
+ }
+ sb.WriteRune(ch)
+ }
+ halfCleaned := cleanPath(sb.String())
+ halfCleaned = strings.ReplaceAll(halfCleaned, string([]byte{tmpCh}), "")
+
+ return halfCleaned
+}
+
+// cleanPath does path.Clean(p) but preserves any trailing slash.
+func cleanPath(p string) string {
+ cleaned := path.Clean(p)
+ if cleaned != "/" && strings.HasSuffix(p, "/") {
+ cleaned = cleaned + "/"
+ }
+ return cleaned
+}
+
// tlsPlaceholderWrapper is a no-op listener wrapper that marks
// where the TLS listener should be in a chain of listener wrappers.
// It should only be used if another listener wrapper must be placed
diff --git a/modules/caddyhttp/caddyhttp_test.go b/modules/caddyhttp/caddyhttp_test.go
index 09011fe..1bca4d6 100644
--- a/modules/caddyhttp/caddyhttp_test.go
+++ b/modules/caddyhttp/caddyhttp_test.go
@@ -92,3 +92,60 @@ func TestSanitizedPathJoin(t *testing.T) {
}
}
}
+
+func TestCleanPath(t *testing.T) {
+ for i, tc := range []struct {
+ input string
+ mergeSlashes bool
+ expect string
+ }{
+ {
+ input: "/foo",
+ expect: "/foo",
+ },
+ {
+ input: "/foo/",
+ expect: "/foo/",
+ },
+ {
+ input: "//foo",
+ expect: "//foo",
+ },
+ {
+ input: "//foo",
+ mergeSlashes: true,
+ expect: "/foo",
+ },
+ {
+ input: "/foo//bar/",
+ mergeSlashes: true,
+ expect: "/foo/bar/",
+ },
+ {
+ input: "/foo/./.././bar",
+ expect: "/bar",
+ },
+ {
+ input: "/foo//./..//./bar",
+ expect: "/foo//bar",
+ },
+ {
+ input: "/foo///./..//./bar",
+ expect: "/foo///bar",
+ },
+ {
+ input: "/foo///./..//.",
+ expect: "/foo//",
+ },
+ {
+ input: "/foo//./bar",
+ expect: "/foo//bar",
+ },
+ } {
+ actual := CleanPath(tc.input, tc.mergeSlashes)
+ if actual != tc.expect {
+ t.Errorf("Test %d [input='%s' mergeSlashes=%t]: Got '%s', expected '%s'",
+ i, tc.input, tc.mergeSlashes, actual, tc.expect)
+ }
+ }
+}
diff --git a/modules/caddyhttp/fileserver/staticfiles.go b/modules/caddyhttp/fileserver/staticfiles.go
index a745d5a..554f8d3 100644
--- a/modules/caddyhttp/fileserver/staticfiles.go
+++ b/modules/caddyhttp/fileserver/staticfiles.go
@@ -23,7 +23,6 @@ import (
weakrand "math/rand"
"mime"
"net/http"
- "net/url"
"os"
"path"
"path/filepath"
@@ -236,16 +235,7 @@ func (fsrv *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request, next c
filesToHide := fsrv.transformHidePaths(repl)
root := repl.ReplaceAll(fsrv.Root, ".")
- // PathUnescape returns an error if the escapes aren't well-formed,
- // meaning the count % matches the RFC. Return early if the escape is
- // improper.
- if _, err := url.PathUnescape(r.URL.Path); err != nil {
- fsrv.logger.Debug("improper path escape",
- zap.String("site_root", root),
- zap.String("request_path", r.URL.Path),
- zap.Error(err))
- return err
- }
+
filename := caddyhttp.SanitizedPathJoin(root, r.URL.Path)
fsrv.logger.Debug("sanitized path join",
diff --git a/modules/caddyhttp/matchers.go b/modules/caddyhttp/matchers.go
index bb957d6..d6bbe7e 100644
--- a/modules/caddyhttp/matchers.go
+++ b/modules/caddyhttp/matchers.go
@@ -23,7 +23,6 @@ import (
"net/textproto"
"net/url"
"path"
- "path/filepath"
"reflect"
"regexp"
"sort"
@@ -63,20 +62,51 @@ type (
// Duplicate entries will return an error.
MatchHost []string
- // MatchPath matches requests by the URI's path (case-insensitive). Path
- // matches are exact, but wildcards may be used:
+ // MatchPath case-insensitively matches requests by the URI's path. Path
+ // matching is exact, not prefix-based, giving you more control and clarity
+ // over matching. Wildcards (`*`) may be used:
//
- // - At the end, for a prefix match (`/prefix/*`)
- // - At the beginning, for a suffix match (`*.suffix`)
- // - On both sides, for a substring match (`*/contains/*`)
+ // - At the end only, for a prefix match (`/prefix/*`)
+ // - At the beginning only, for a suffix match (`*.suffix`)
+ // - On both sides only, for a substring match (`*/contains/*`)
// - In the middle, for a globular match (`/accounts/*/info`)
//
+ // Slashes are significant; i.e. `/foo*` matches `/foo`, `/foo/`, `/foo/bar`,
+ // and `/foobar`; but `/foo/*` does not match `/foo` or `/foobar`. Valid
+ // paths start with a slash `/`.
+ //
+ // Because there are, in general, multiple possible escaped forms of any
+ // path, path matchers operate in unescaped space; that is, path matchers
+ // should be written in their unescaped form to prevent ambiguities and
+ // possible security issues, as all request paths will be normalized to
+ // their unescaped forms before matcher evaluation.
+ //
+ // However, escape sequences in a match pattern are supported; they are
+ // compared with the request's raw/escaped path for those bytes only.
+ // In other words, a matcher of `/foo%2Fbar` will match a request path
+ // of precisely `/foo%2Fbar`, but not `/foo/bar`. It follows that matching
+ // the literal percent sign (%) in normalized space can be done using the
+ // escaped form, `%25`.
+ //
+ // Even though wildcards (`*`) operate in the normalized space, the special
+ // escaped wildcard (`%*`), which is not a valid escape sequence, may be
+ // used in place of a span that should NOT be decoded; that is, `/bands/%*`
+ // will match `/bands/AC%2fDC` whereas `/bands/*` will not.
+ //
+ // Even though path matching is done in normalized space, the special
+ // wildcard `%*` may be used in place of a span that should NOT be decoded;
+ // that is, `/bands/%*/` will match `/bands/AC%2fDC/` whereas `/bands/*/`
+ // will not.
+ //
// This matcher is fast, so it does not support regular expressions or
// capture groups. For slower but more powerful matching, use the
- // path_regexp matcher.
+ // path_regexp matcher. (Note that due to the special treatment of
+ // escape sequences in matcher patterns, they may perform slightly slower
+ // in high-traffic environments.)
MatchPath []string
// MatchPathRE matches requests by a regular expression on the URI's path.
+ // Path matching is performed in the unescaped (decoded) form of the path.
//
// Upon a match, it adds placeholders to the request: `{http.regexp.name.capture_group}`
// where `name` is the regular expression's name, and `capture_group` is either
@@ -303,7 +333,8 @@ outer:
// expression matchers.
//
// Example:
-// expression host('localhost')
+//
+// expression host('localhost')
func (MatchHost) CELLibrary(ctx caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
"host",
@@ -342,6 +373,7 @@ func (MatchPath) CaddyModule() caddy.ModuleInfo {
// Provision lower-cases the paths in m to ensure case-insensitive matching.
func (m MatchPath) Provision(_ caddy.Context) error {
for i := range m {
+ // TODO: if m[i] == "*", put it first and delete all others (will always match)
m[i] = strings.ToLower(m[i])
}
return nil
@@ -349,77 +381,108 @@ func (m MatchPath) Provision(_ caddy.Context) error {
// Match returns true if r matches m.
func (m MatchPath) Match(r *http.Request) bool {
- // PathUnescape returns an error if the escapes aren't
- // well-formed, meaning the count % matches the RFC.
- // Return early if the escape is improper.
- unescapedPath, err := url.PathUnescape(r.URL.Path)
- if err != nil {
- return false
- }
-
- 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
+ // Even though RFC 9110 says that path matching is case-sensitive
+ // (https://www.rfc-editor.org/rfc/rfc9110.html#section-4.2.3),
+ // we do case-insensitive matching to mitigate security issues
+ // related to differences between operating systems, applications,
+ // etc; if case-sensitive matching is needed, the regex matcher
+ // can be used instead.
+ reqPath := strings.ToLower(r.URL.Path)
+
+ // 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
// as static files, exposing the source code, instead of
- // being matched by *.php to be treated as PHP scripts
- lowerPath = strings.TrimRight(lowerPath, ". ")
-
- // Cleaning may remove the trailing slash, but we want to keep it
- if lowerPath != "/" && strings.HasSuffix(r.URL.Path, "/") {
- lowerPath = lowerPath + "/"
- }
+ // being matched by *.php to be treated as PHP scripts.
+ reqPath = strings.TrimRight(reqPath, ". ")
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
- for _, matchPath := range m {
- matchPath = repl.ReplaceAll(matchPath, "")
+ for _, matchPattern := range m {
+ matchPattern = repl.ReplaceAll(matchPattern, "")
// special case: whole path is wildcard; this is unnecessary
// as it matches all requests, which is the same as no matcher
- if matchPath == "*" {
+ if matchPattern == "*" {
return true
}
- // special case: first and last characters are wildcard,
- // treat it as a fast substring match
- if len(matchPath) > 1 &&
- strings.HasPrefix(matchPath, "*") &&
- strings.HasSuffix(matchPath, "*") {
- if strings.Contains(lowerPath, matchPath[1:len(matchPath)-1]) {
+ // Clean the path, merge doubled slashes, etc.
+ // This ensures maliciously crafted requests can't bypass
+ // the path matcher. See #4407. Good security posture
+ // requires that we should do all we can to reduce any
+ // funny-looking paths into "normalized" forms such that
+ // weird variants can't sneak by.
+ //
+ // How we clean the path depends on the kind of pattern:
+ // we either merge slashes or we don't. If the pattern
+ // has double slashes, we preserve them in the path.
+ //
+ // TODO: Despite the fact that the *vast* majority of path
+ // matchers have only 1 pattern, a possible optimization is
+ // to remember the cleaned form of the path for future
+ // iterations; it's just that the way we clean depends on
+ // the kind of pattern.
+
+ mergeSlashes := !strings.Contains(matchPattern, "//")
+
+ // if '%' appears in the match pattern, we interpret that to mean
+ // the intent is to compare that part of the path in raw/escaped
+ // space; i.e. "%40"=="%40", not "@", and "%2F"=="%2F", not "/"
+ if strings.Contains(matchPattern, "%") {
+ reqPathForPattern := CleanPath(r.URL.EscapedPath(), mergeSlashes)
+ if m.matchPatternWithEscapeSequence(reqPathForPattern, matchPattern) {
return true
}
+
+ // doing prefix/suffix/substring matches doesn't make sense
continue
}
- // special case: first character is a wildcard,
- // treat it as a fast suffix match
- if strings.HasPrefix(matchPath, "*") {
- if strings.HasSuffix(lowerPath, matchPath[1:]) {
+ reqPathForPattern := CleanPath(reqPath, mergeSlashes)
+
+ // for substring, prefix, and suffix matching, only perform those
+ // special, fast matches if they are the only wildcards in the pattern;
+ // otherwise we assume a globular match if any * appears in the middle
+
+ // special case: first and last characters are wildcard,
+ // treat it as a fast substring match
+ if strings.Count(matchPattern, "*") == 2 &&
+ strings.HasPrefix(matchPattern, "*") &&
+ strings.HasSuffix(matchPattern, "*") &&
+ strings.Count(matchPattern, "*") == 2 {
+ if strings.Contains(reqPathForPattern, matchPattern[1:len(matchPattern)-1]) {
return true
}
continue
}
- // special case: last character is a wildcard,
- // treat it as a fast prefix match
- if strings.HasSuffix(matchPath, "*") {
- if strings.HasPrefix(lowerPath, matchPath[:len(matchPath)-1]) {
- return true
+ // only perform prefix/suffix match if it is the only wildcard...
+ // I think that is more correct most of the time
+ if strings.Count(matchPattern, "*") == 1 {
+ // special case: first character is a wildcard,
+ // treat it as a fast suffix match
+ if strings.HasPrefix(matchPattern, "*") {
+ if strings.HasSuffix(reqPathForPattern, matchPattern[1:]) {
+ return true
+ }
+ continue
+ }
+
+ // special case: last character is a wildcard,
+ // treat it as a fast prefix match
+ if strings.HasSuffix(matchPattern, "*") {
+ if strings.HasPrefix(reqPathForPattern, matchPattern[:len(matchPattern)-1]) {
+ return true
+ }
+ continue
}
- continue
}
- // for everything else, try globular matching, which also
- // is exact matching if there are no glob/wildcard chars;
- // can ignore error here because we can't handle it anyway
- matches, _ := filepath.Match(matchPath, lowerPath)
+ // at last, use globular matching, which also is exact matching
+ // if there are no glob/wildcard chars; we ignore the error here
+ // because we can't handle it anyway
+ matches, _ := path.Match(matchPattern, reqPathForPattern)
if matches {
return true
}
@@ -427,11 +490,118 @@ func (m MatchPath) Match(r *http.Request) bool {
return false
}
+func (MatchPath) matchPatternWithEscapeSequence(escapedPath, matchPath string) bool {
+ // We would just compare the pattern against r.URL.Path,
+ // but the pattern contains %, indicating that we should
+ // compare at least some part of the path in raw/escaped
+ // space, not normalized space; so we build the string we
+ // will compare against by adding the normalized parts
+ // of the path, then switching to the escaped parts where
+ // the pattern hints to us wherever % is present.
+ var sb strings.Builder
+
+ // iterate the pattern and escaped path in lock-step;
+ // increment iPattern every time we consume a char from the pattern,
+ // increment iPath every time we consume a char from the path;
+ // iPattern and iPath are our cursors/iterator positions for each string
+ var iPattern, iPath int
+ for {
+ if iPattern >= len(matchPath) || iPath >= len(escapedPath) {
+ break
+ }
+
+ // get the next character from the request path
+
+ pathCh := string(escapedPath[iPath])
+ var escapedPathCh string
+
+ // normalize (decode) escape sequences
+ if pathCh == "%" && len(escapedPath) >= iPath+3 {
+ // hold onto this in case we find out the intent is to match in escaped space here;
+ // we lowercase it even though technically the spec says: "For consistency, URI
+ // producers and normalizers should use uppercase hexadecimal digits for all percent-
+ // encodings" (RFC 3986 section 2.1) - we lowercased the matcher pattern earlier in
+ // provisioning so we do the same here to gain case-insensitivity in equivalence;
+ // besides, this string is never shown visibly
+ escapedPathCh = strings.ToLower(escapedPath[iPath : iPath+3])
+
+ var err error
+ pathCh, err = url.PathUnescape(escapedPathCh)
+ if err != nil {
+ // should be impossible unless EscapedPath() is giving us an invalid sequence!
+ return false
+ }
+ iPath += 2 // escape sequence is 2 bytes longer than normal char
+ }
+
+ // now get the next character from the pattern
+
+ normalize := true
+ switch matchPath[iPattern] {
+ case '%':
+ // escape sequence
+
+ // if not a wildcard ("%*"), compare literally; consume next two bytes of pattern
+ if len(matchPath) >= iPattern+3 && matchPath[iPattern+1] != '*' {
+ sb.WriteString(escapedPathCh)
+ iPath++
+ iPattern += 2
+ break
+ }
+
+ // escaped wildcard sequence; consume next byte only ('*')
+ iPattern++
+ normalize = false
+
+ fallthrough
+ case '*':
+ // wildcard, so consume until next matching character
+ remaining := escapedPath[iPath:]
+ until := len(escapedPath) - iPath // go until end of string...
+ if iPattern < len(matchPath)-1 { // ...unless the * is not at the end
+ nextCh := matchPath[iPattern+1]
+ until = strings.IndexByte(remaining, nextCh)
+ if until == -1 {
+ // terminating char of wildcard span not found, so definitely no match
+ return false
+ }
+ }
+ if until == 0 {
+ // empty span; nothing to add on this iteration
+ break
+ }
+ next := remaining[:until]
+ if normalize {
+ var err error
+ next, err = url.PathUnescape(next)
+ if err != nil {
+ return false // should be impossible anyway
+ }
+ }
+ sb.WriteString(next)
+ iPath += until
+ default:
+ sb.WriteString(pathCh)
+ iPath++
+ }
+
+ iPattern++
+ }
+
+ // we can now treat rawpath globs (%*) as regular globs (*)
+ matchPath = strings.ReplaceAll(matchPath, "%*", "*")
+
+ // ignore error here because we can't handle it anyway=
+ matches, _ := path.Match(matchPath, sb.String())
+ return matches
+}
+
// CELLibrary produces options that expose this matcher for use in CEL
// expression matchers.
//
// Example:
-// expression path('*substring*', '*suffix')
+//
+// expression path('*substring*', '*suffix')
func (MatchPath) CELLibrary(ctx caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
// name of the macro, this is the function name that users see when writing expressions.
@@ -477,23 +647,10 @@ func (MatchPathRE) CaddyModule() caddy.ModuleInfo {
func (m MatchPathRE) Match(r *http.Request) bool {
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
- // PathUnescape returns an error if the escapes aren't
- // well-formed, meaning the count % matches the RFC.
- // Return early if the escape is improper.
- unescapedPath, err := url.PathUnescape(r.URL.Path)
- if err != nil {
- return false
- }
-
// Clean the path, merges doubled slashes, etc.
// This ensures maliciously crafted requests can't bypass
// the path matcher. See #4407
- cleanedPath := path.Clean(unescapedPath)
-
- // Cleaning may remove the trailing slash, but we want to keep it
- if cleanedPath != "/" && strings.HasSuffix(r.URL.Path, "/") {
- cleanedPath = cleanedPath + "/"
- }
+ cleanedPath := cleanPath(r.URL.Path)
return m.MatchRegexp.Match(cleanedPath, repl)
}
@@ -502,7 +659,8 @@ func (m MatchPathRE) Match(r *http.Request) bool {
// expression matchers.
//
// Example:
-// expression path_regexp('^/bar')
+//
+// expression path_regexp('^/bar')
func (MatchPathRE) CELLibrary(ctx caddy.Context) (cel.Library, error) {
unnamedPattern, err := CELMatcherImpl(
"path_regexp",
@@ -575,7 +733,8 @@ func (m MatchMethod) Match(r *http.Request) bool {
// expression matchers.
//
// Example:
-// expression method('PUT', 'POST')
+//
+// expression method('PUT', 'POST')
func (MatchMethod) CELLibrary(_ caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
"method",
@@ -661,7 +820,8 @@ func (m MatchQuery) Match(r *http.Request) bool {
// expression matchers.
//
// Example:
-// expression query({'sort': 'asc'}) || query({'foo': ['*bar*', 'baz']})
+//
+// expression query({'sort': 'asc'}) || query({'foo': ['*bar*', 'baz']})
func (MatchQuery) CELLibrary(_ caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
"query",
@@ -736,8 +896,9 @@ func (m MatchHeader) Match(r *http.Request) bool {
// expression matchers.
//
// Example:
-// expression header({'content-type': 'image/png'})
-// expression header({'foo': ['bar', 'baz']}) // match bar or baz
+//
+// expression header({'content-type': 'image/png'})
+// expression header({'foo': ['bar', 'baz']}) // match bar or baz
func (MatchHeader) CELLibrary(_ caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
"header",
@@ -894,7 +1055,8 @@ func (m MatchHeaderRE) Validate() error {
// expression matchers.
//
// Example:
-// expression header_regexp('foo', 'Field', 'fo+')
+//
+// expression header_regexp('foo', 'Field', 'fo+')
func (MatchHeaderRE) CELLibrary(ctx caddy.Context) (cel.Library, error) {
unnamedPattern, err := CELMatcherImpl(
"header_regexp",
@@ -978,7 +1140,8 @@ func (m *MatchProtocol) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
// expression matchers.
//
// Example:
-// expression protocol('https')
+//
+// expression protocol('https')
func (MatchProtocol) CELLibrary(_ caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
"protocol",
@@ -1097,7 +1260,8 @@ func (m *MatchRemoteIP) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
// expression matchers.
//
// Example:
-// expression remote_ip('forwarded', '192.168.0.0/16', '172.16.0.0/12', '10.0.0.0/8')
+//
+// expression remote_ip('forwarded', '192.168.0.0/16', '172.16.0.0/12', '10.0.0.0/8')
func (MatchRemoteIP) CELLibrary(ctx caddy.Context) (cel.Library, error) {
return CELMatcherImpl(
// name of the macro, this is the function name that users see when writing expressions.
diff --git a/modules/caddyhttp/matchers_test.go b/modules/caddyhttp/matchers_test.go
index bd4606b..4d5538c 100644
--- a/modules/caddyhttp/matchers_test.go
+++ b/modules/caddyhttp/matchers_test.go
@@ -158,9 +158,10 @@ func TestHostMatcher(t *testing.T) {
func TestPathMatcher(t *testing.T) {
for i, tc := range []struct {
- match MatchPath
- input string
- expect bool
+ match MatchPath // not URI-encoded because not parsing from a URI
+ input string // should be valid URI encoding (escaped) since it will become part of a request
+ expect bool
+ provisionErr bool
}{
{
match: MatchPath{},
@@ -253,6 +254,11 @@ func TestPathMatcher(t *testing.T) {
expect: true,
},
{
+ match: MatchPath{"*.php"},
+ input: "/foo/index.php. .",
+ expect: true,
+ },
+ {
match: MatchPath{"/foo/bar.txt"},
input: "/foo/BAR.txt",
expect: true,
@@ -263,11 +269,61 @@ func TestPathMatcher(t *testing.T) {
expect: true,
},
{
- match: MatchPath{"/foo*"},
+ match: MatchPath{"/foo"},
input: "//foo",
expect: true,
},
{
+ match: MatchPath{"//foo"},
+ input: "/foo",
+ expect: false,
+ },
+ {
+ match: MatchPath{"//foo"},
+ input: "//foo",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo//*"},
+ input: "/foo//bar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo//*"},
+ input: "/foo/%2Fbar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo/%2F*"},
+ input: "/foo/%2Fbar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo/%2F*"},
+ input: "/foo//bar",
+ expect: false,
+ },
+ {
+ match: MatchPath{"/foo//bar"},
+ input: "/foo//bar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo/*//bar"},
+ input: "/foo///bar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo/%*//bar"},
+ input: "/foo///bar",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo/%*//bar"},
+ input: "/foo//%2Fbar",
+ expect: true,
+ },
+ {
match: MatchPath{"/foo*"},
input: "/%2F/foo",
expect: true,
@@ -292,8 +348,79 @@ func TestPathMatcher(t *testing.T) {
input: "/foo/bar",
expect: true,
},
+ // notice these next three test cases are the same normalized path but are written differently
+ {
+ match: MatchPath{"/%25@.txt"},
+ input: "/%25@.txt",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/%25@.txt"},
+ input: "/%25%40.txt",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/%25%40.txt"},
+ input: "/%25%40.txt",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/bands/*/*"},
+ input: "/bands/AC%2FDC/T.N.T",
+ expect: false, // because * operates in normalized space
+ },
+ {
+ match: MatchPath{"/bands/%*/%*"},
+ input: "/bands/AC%2FDC/T.N.T",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/bands/%*/%*"},
+ input: "/bands/AC/DC/T.N.T",
+ expect: false,
+ },
+ {
+ match: MatchPath{"/bands/%*"},
+ input: "/bands/AC/DC",
+ expect: false, // not a suffix match
+ },
+ {
+ match: MatchPath{"/bands/%*"},
+ input: "/bands/AC%2FDC",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo%2fbar/baz"},
+ input: "/foo%2Fbar/baz",
+ expect: true,
+ },
+ {
+ match: MatchPath{"/foo%2fbar/baz"},
+ input: "/foo/bar/baz",
+ expect: false,
+ },
+ {
+ match: MatchPath{"/foo/bar/baz"},
+ input: "/foo%2fbar/baz",
+ expect: true,
+ },
} {
- req := &http.Request{URL: &url.URL{Path: tc.input}}
+ err := tc.match.Provision(caddy.Context{})
+ if err == nil && tc.provisionErr {
+ t.Errorf("Test %d %v: Expected error provisioning, but there was no error", i, tc.match)
+ }
+ if err != nil && !tc.provisionErr {
+ t.Errorf("Test %d %v: Expected no error provisioning, but there was an error: %v", i, tc.match, err)
+ }
+ if tc.provisionErr {
+ continue // if it's not supposed to provision properly, pointless to test it
+ }
+
+ u, err := url.ParseRequestURI(tc.input)
+ if err != nil {
+ t.Fatalf("Test %d (%v): Invalid request URI (should be rejected by Go's HTTP server): %v", i, tc.input, err)
+ }
+ req := &http.Request{URL: u}
repl := caddy.NewReplacer()
ctx := context.WithValue(req.Context(), caddy.ReplacerCtxKey, repl)
req = req.WithContext(ctx)
@@ -387,6 +514,16 @@ func TestPathREMatcher(t *testing.T) {
expect: true,
expectRepl: map[string]string{"name.myparam": "bar"},
},
+ {
+ match: MatchPathRE{MatchRegexp{Pattern: "^/%@.txt"}},
+ input: "/%25@.txt",
+ expect: true,
+ },
+ {
+ match: MatchPathRE{MatchRegexp{Pattern: "^/%25@.txt"}},
+ input: "/%25@.txt",
+ expect: false,
+ },
} {
// compile the regexp and validate its name
err := tc.match.Provision(caddy.Context{})
@@ -401,7 +538,11 @@ func TestPathREMatcher(t *testing.T) {
}
// set up the fake request and its Replacer
- req := &http.Request{URL: &url.URL{Path: tc.input}}
+ u, err := url.ParseRequestURI(tc.input)
+ if err != nil {
+ t.Fatalf("Test %d: Bad input URI: %v", i, err)
+ }
+ req := &http.Request{URL: u}
repl := caddy.NewReplacer()
ctx := context.WithValue(req.Context(), caddy.ReplacerCtxKey, repl)
req = req.WithContext(ctx)
diff --git a/modules/caddyhttp/rewrite/rewrite.go b/modules/caddyhttp/rewrite/rewrite.go
index 7da2327..4316b5a 100644
--- a/modules/caddyhttp/rewrite/rewrite.go
+++ b/modules/caddyhttp/rewrite/rewrite.go
@@ -31,13 +31,25 @@ func init() {
caddy.RegisterModule(Rewrite{})
}
-// Rewrite is a middleware which can rewrite HTTP requests.
+// Rewrite is a middleware which can rewrite/mutate HTTP requests.
//
-// The Method and URI properties are "setters": the request URI
-// will be set to the given values. Other properties are "modifiers":
-// they modify existing files but do not explicitly specify what the
-// result will be. It is atypical to combine the use of setters and
+// The Method and URI properties are "setters" (the request URI
+// will be overwritten with the given values). Other properties are
+// "modifiers" (they modify existing values in a differentiable
+// way). It is atypical to combine the use of setters and
// modifiers in a single rewrite.
+//
+// To ensure consistent behavior, prefix and suffix stripping is
+// performed in the URL-decoded (unescaped, normalized) space by
+// default except for the specific bytes where an escape sequence
+// is used in the prefix or suffix pattern.
+//
+// For all modifiers, paths are cleaned before being modified so that
+// multiple, consecutive slashes are collapsed into a single slash,
+// and dot elements are resolved and removed. In the special case
+// of a prefix, suffix, or substring containing "//" (repeated slashes),
+// slashes will not be merged while cleaning the path so that
+// the rewrite can be interpreted literally.
type Rewrite struct {
// Changes the request's HTTP verb.
Method string `json:"method,omitempty"`
@@ -59,9 +71,15 @@ type Rewrite struct {
URI string `json:"uri,omitempty"`
// Strips the given prefix from the beginning of the URI path.
+ // The prefix should be written in normalized (unescaped) form,
+ // but if an escaping (`%xx`) is used, the path will be required
+ // to have that same escape at that position in order to match.
StripPathPrefix string `json:"strip_path_prefix,omitempty"`
// Strips the given suffix from the end of the URI path.
+ // The suffix should be written in normalized (unescaped) form,
+ // but if an escaping (`%xx`) is used, the path will be required
+ // to have that same escape at that position in order to match.
StripPathSuffix string `json:"strip_path_suffix,omitempty"`
// Performs substring replacements on the URI.
@@ -227,17 +245,18 @@ func (rewr Rewrite) Rewrite(r *http.Request, repl *caddy.Replacer) bool {
// strip path prefix or suffix
if rewr.StripPathPrefix != "" {
prefix := repl.ReplaceAll(rewr.StripPathPrefix, "")
- r.URL.RawPath = strings.TrimPrefix(r.URL.RawPath, prefix)
- if p, err := url.PathUnescape(r.URL.RawPath); err == nil && p != "" {
- r.URL.Path = p
- } else {
- r.URL.Path = strings.TrimPrefix(r.URL.Path, prefix)
- }
+ mergeSlashes := !strings.Contains(prefix, "//")
+ changePath(r, func(escapedPath string) string {
+ escapedPath = caddyhttp.CleanPath(escapedPath, mergeSlashes)
+ return trimPathPrefix(escapedPath, prefix)
+ })
}
if rewr.StripPathSuffix != "" {
suffix := repl.ReplaceAll(rewr.StripPathSuffix, "")
- changePath(r, func(pathOrRawPath string) string {
- return strings.TrimSuffix(pathOrRawPath, suffix)
+ mergeSlashes := !strings.Contains(suffix, "//")
+ changePath(r, func(escapedPath string) string {
+ escapedPath = caddyhttp.CleanPath(escapedPath, mergeSlashes)
+ return reverse(trimPathPrefix(reverse(escapedPath), reverse(suffix)))
})
}
@@ -324,6 +343,58 @@ func buildQueryString(qs string, repl *caddy.Replacer) string {
return sb.String()
}
+// trimPathPrefix is like strings.TrimPrefix, but customized for advanced URI
+// path prefix matching. The string prefix will be trimmed from the beginning
+// of escapedPath if escapedPath starts with prefix. Rather than a naive 1:1
+// comparison of each byte to determine if escapedPath starts with prefix,
+// both strings are iterated in lock-step, and if prefix has a '%' encoding
+// at a particular position, escapedPath must also have the same encoding
+// representation for that character. In other words, if the prefix string
+// uses the escaped form for a character, escapedPath must literally use the
+// same escape at that position. Otherwise, all character comparisons are
+// performed in normalized/unescaped space.
+func trimPathPrefix(escapedPath, prefix string) string {
+ var iPath, iPrefix int
+ for {
+ if iPath >= len(escapedPath) || iPrefix >= len(prefix) {
+ break
+ }
+
+ prefixCh := prefix[iPrefix]
+ ch := string(escapedPath[iPath])
+
+ if ch == "%" && prefixCh != '%' && len(escapedPath) >= iPath+3 {
+ var err error
+ ch, err = url.PathUnescape(escapedPath[iPath : iPath+3])
+ if err != nil {
+ // should be impossible unless EscapedPath() is returning invalid values!
+ return escapedPath
+ }
+ iPath += 2
+ }
+
+ // prefix comparisons are case-insensitive to consistency with
+ // path matcher, which is case-insensitive for good reasons
+ if !strings.EqualFold(ch, string(prefixCh)) {
+ return escapedPath
+ }
+
+ iPath++
+ iPrefix++
+ }
+
+ // found matching prefix, trim it
+ return escapedPath[iPath:]
+}
+
+func reverse(s string) string {
+ r := []rune(s)
+ for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
+ r[i], r[j] = r[j], r[i]
+ }
+ return string(r)
+}
+
// substrReplacer describes either a simple and fast substring replacement.
type substrReplacer struct {
// A substring to find. Supports placeholders.
@@ -351,8 +422,10 @@ func (rep substrReplacer) do(r *http.Request, repl *caddy.Replacer) {
find := repl.ReplaceAll(rep.Find, "")
replace := repl.ReplaceAll(rep.Replace, "")
+ mergeSlashes := !strings.Contains(rep.Find, "//")
+
changePath(r, func(pathOrRawPath string) string {
- return strings.Replace(pathOrRawPath, find, replace, lim)
+ return strings.Replace(caddyhttp.CleanPath(pathOrRawPath, mergeSlashes), find, replace, lim)
})
r.URL.RawQuery = strings.Replace(r.URL.RawQuery, find, replace, lim)
@@ -380,16 +453,17 @@ func (rep regexReplacer) do(r *http.Request, repl *caddy.Replacer) {
})
}
-// changePath updates the path on the request URL. It first executes newVal on
-// req.URL.RawPath, and if the result is a valid escaping, it will be copied
-// into req.URL.Path; otherwise newVal is evaluated only on req.URL.Path.
func changePath(req *http.Request, newVal func(pathOrRawPath string) string) {
- req.URL.RawPath = newVal(req.URL.RawPath)
+ req.URL.RawPath = newVal(req.URL.EscapedPath())
if p, err := url.PathUnescape(req.URL.RawPath); err == nil && p != "" {
req.URL.Path = p
} else {
req.URL.Path = newVal(req.URL.Path)
}
+ // RawPath is only set if it's different from the normalized Path (std lib)
+ if req.URL.RawPath == req.URL.Path {
+ req.URL.RawPath = ""
+ }
}
// Interface guard
diff --git a/modules/caddyhttp/rewrite/rewrite_test.go b/modules/caddyhttp/rewrite/rewrite_test.go
index 84dce95..bc20c85 100644
--- a/modules/caddyhttp/rewrite/rewrite_test.go
+++ b/modules/caddyhttp/rewrite/rewrite_test.go
@@ -235,6 +235,42 @@ func TestRewrite(t *testing.T) {
input: newRequest(t, "GET", "/foo/prefix/bar"),
expect: newRequest(t, "GET", "/foo/prefix/bar"),
},
+ {
+ rule: Rewrite{StripPathPrefix: "//prefix"},
+ // scheme and host needed for URL parser to succeed in setting up test
+ input: newRequest(t, "GET", "http://host//prefix/foo/bar"),
+ expect: newRequest(t, "GET", "http://host/foo/bar"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "//prefix"},
+ input: newRequest(t, "GET", "/prefix/foo/bar"),
+ expect: newRequest(t, "GET", "/prefix/foo/bar"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "/a%2Fb/c"},
+ input: newRequest(t, "GET", "/a%2Fb/c/d"),
+ expect: newRequest(t, "GET", "/d"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "/a%2Fb/c"},
+ input: newRequest(t, "GET", "/a%2fb/c/d"),
+ expect: newRequest(t, "GET", "/d"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "/a/b/c"},
+ input: newRequest(t, "GET", "/a%2Fb/c/d"),
+ expect: newRequest(t, "GET", "/d"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "/a%2Fb/c"},
+ input: newRequest(t, "GET", "/a/b/c/d"),
+ expect: newRequest(t, "GET", "/a/b/c/d"),
+ },
+ {
+ rule: Rewrite{StripPathPrefix: "//a%2Fb/c"},
+ input: newRequest(t, "GET", "/a/b/c/d"),
+ expect: newRequest(t, "GET", "/a/b/c/d"),
+ },
{
rule: Rewrite{StripPathSuffix: "/suffix"},
@@ -252,6 +288,11 @@ func TestRewrite(t *testing.T) {
expect: newRequest(t, "GET", "/foo%2Fbar/"),
},
{
+ rule: Rewrite{StripPathSuffix: "%2fsuffix"},
+ input: newRequest(t, "GET", "/foo%2Fbar%2fsuffix"),
+ expect: newRequest(t, "GET", "/foo%2Fbar"),
+ },
+ {
rule: Rewrite{StripPathSuffix: "/suffix"},
input: newRequest(t, "GET", "/foo/suffix/bar"),
expect: newRequest(t, "GET", "/foo/suffix/bar"),
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 17:35:22 +0000