On Tue, Feb 2, 2021 at 11:32 AM Ruediger Pluem <[email protected]> wrote:
>
> On 1/7/21 2:19 PM, [email protected] wrote:
> > Author: ylavic
> > Date: Thu Jan 7 13:19:08 2021
> > New Revision: 1885239
[]
> >
> > - /* find the scheme */
> > - u = strchr(url, ':');
> > - if (u == NULL || u[1] != '/' || u[2] != '/' || u[3] == '\0')
> > + scheme = get_url_scheme(&u, &is_ssl);
> > + if (!scheme && proxyname && strncasecmp(url, "ftp:", 4) == 0) {
> > + u = url + 4;
> > + scheme = "ftp";
> > + is_ssl = 0;
> > + }
> > + if (!scheme || u[0] != '/' || u[1] != '/' || u[2] == '\0') {
> > + if (!scheme && (u = strchr(url, ':')) && (u - url) > 14) {
> > + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10262)
> > + "overlong proxy URL scheme in %s", url);
> > + return HTTP_BAD_REQUEST;
> > + }
>
> This breaks forward proxies with the CONNECT method.
> For CONNECT somwhere123456789.com:443 schema is NULL and u[0] is 's' and
> hence != /.
Yes, sorry about that.
>
> The following patches fixes this:
>
> Index: mod_proxy_http.c
> ===================================================================
> --- mod_proxy_http.c (revision 1886120)
> +++ mod_proxy_http.c (working copy)
> @@ -1903,15 +1903,15 @@
> is_ssl = 0;
> }
> if (!scheme || u[0] != '/' || u[1] != '/' || u[2] == '\0') {
> - if (!scheme && (u = strchr(url, ':')) && (u - url) > 14) {
> - ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10262)
> - "overlong proxy URL scheme in %s", url);
> - return HTTP_BAD_REQUEST;
> - }
> ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01113)
> "HTTP: declining URL %s", url);
> return DECLINED; /* only interested in HTTP, WS or FTP via proxy */
> }
> + if (!scheme && (u = strchr(url, ':')) && (u - url) > 14) {
> + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10262)
> + "overlong proxy URL scheme in %s", url);
> + return HTTP_BAD_REQUEST;
> + }
> if (is_ssl && !ap_proxy_ssl_enable(NULL)) {
> ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01112)
> "HTTP: declining URL %s (mod_ssl not configured?)",
> url);
+1
>
> Unfortunately this has been already backported in r1885605 and hence 2.4.x is
> now broken as well.
Will you commit the above patch (or should I)?
Then I could propose it for backport with the other needed
core_output_filter() change.
Thanks for the review (again and again :).
Regards;
Yann.
