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net/http/cgi: reject invalid header names

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Being lenient on those has caused enough security issues.

Spun out of CL 231419.

Fixes #38889

Change-Id: Idd3bc6adc22e08a30b3dabb146ce78d4105684cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/232277
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Filippo Valsorda 2020-05-05 00:11:00 -04:00
parent 7d232ab276
commit e538b7e931
2 changed files with 7 additions and 2 deletions
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2
src/go/build/deps_test.go
View File

@ -448,7 +448,7 @@ var pkgDeps = map[string][]string{
// HTTP-using packages.
"expvar": {"L4", "OS", "encoding/json", "net/http"},
"net/http/cgi": {"L4", "NET", "OS", "crypto/tls", "net/http", "regexp"},
"net/http/cgi": {"L4", "NET", "OS", "crypto/tls", "net/http", "regexp", "golang.org/x/net/http/httpguts"},
"net/http/cookiejar": {"L4", "NET", "net/http"},
"net/http/fcgi": {"L4", "NET", "OS", "context", "net/http", "net/http/cgi"},
"net/http/httptest": {

7
src/net/http/cgi/host.go
View File

@ -29,6 +29,8 @@ import (
"runtime"
"strconv"
"strings"
"golang.org/x/net/http/httpguts"
)
var trailingPort = regexp.MustCompile(`:([0-9]+)$`)
@ -277,7 +279,10 @@ func (h *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
continue
}
header, val := parts[0], parts[1]
header = textproto.TrimString(header)
if !httpguts.ValidHeaderFieldName(header) {
h.printf("cgi: invalid header name: %q", header)
continue
}
val = textproto.TrimString(val)
switch {
case header == "Status":