Claudio Jeker(cje...@diehard.n-r-g.com) on 2021.10.21 17:19:02 +0200:
> > + version = http_version_num(desc->http_version);
>
> I woud prefer if this code would store the version not in
> desc->http_version until after the strdup(). The way these strdup work is
> just wonky. Especil in the failure cases this may result in calling free
> on the wrong thing.
Yes, this was actually the reason for the convoluted if (version.. ) bits,
because server_abort_http() calls into server_close() to free desc->http_version
and that is a crash when not pointing to the strduped string.
Fixed.
> > + if (version == 11) {
> > + if ((desc->http_version =
> > + strdup("HTTP/1.1")) == NULL)
> > + goto fail;
> > + } else {
> > + if ((desc->http_version =
> > + strdup(desc->http_version)) == NULL)
> > + goto fail;
> > + }
> > +
> > + if (version == 0) {
> > + server_abort_http(clt, 505, "bad http version");
> > + goto abort;
> > + }
>
> I would prefer to have this as:
> if (version == 0) {
> } else if if (version == 11) {
> } else {
> }
Fixed.
ok?
diff --git usr.sbin/httpd/server_http.c usr.sbin/httpd/server_http.c
index 6a74f3e45c5..e65a667c556 100644
--- usr.sbin/httpd/server_http.c
+++ usr.sbin/httpd/server_http.c
@@ -51,6 +51,7 @@ int server_http_authenticate(struct server_config
*,
struct client *);
char *server_expand_http(struct client *, const char *,
char *, size_t);
+int http_version_num(char *);
static struct http_method http_methods[] = HTTP_METHODS;
static struct http_error http_errors[] = HTTP_ERRORS;
@@ -111,7 +112,7 @@ server_httpdesc_free(struct http_descriptor *desc)
desc->http_query = NULL;
free(desc->http_query_alias);
desc->http_query_alias = NULL;
- free(desc->http_version);
+ free(desc->http_version); //XXXXXXXXXX
desc->http_version = NULL;
free(desc->http_host);
desc->http_host = NULL;
@@ -198,6 +199,20 @@ done:
return (ret);
}
+int
+http_version_num(char *version)
+{
+ if (strcmp(version, "HTTP/0.9") == 0)
+ return (9);
+ if (strcmp(version, "HTTP/1.0") == 0)
+ return (10);
+ /* any other version 1.x gets downgraded to 1.1 */
+ if (strncmp(version, "HTTP/1", 6) == 0)
+ return (11);
+
+ return (0);
+}
+
void
server_read_http(struct bufferevent *bev, void *arg)
{
@@ -206,7 +221,9 @@ server_read_http(struct bufferevent *bev, void *arg)
struct evbuffer *src = EVBUFFER_INPUT(bev);
char *line = NULL, *key, *value;
const char *errstr;
+ char *http_version;
size_t size, linelen;
+ int version;
struct kv *hdr = NULL;
getmonotime(&clt->clt_tv_last);
@@ -317,24 +334,39 @@ server_read_http(struct bufferevent *bev, void *arg)
if (desc->http_path == NULL)
goto fail;
- desc->http_version = strchr(desc->http_path, ' ');
- if (desc->http_version == NULL) {
+ http_version = strchr(desc->http_path, ' ');
+ if (http_version == NULL) {
server_abort_http(clt, 400, "malformed");
goto abort;
}
- *desc->http_version++ = '\0';
+ *http_version++ = '\0';
desc->http_query = strchr(desc->http_path, '?');
if (desc->http_query != NULL)
*desc->http_query++ = '\0';
/*
- * Have to allocate the strings because they could
+ * We have to allocate the strings because they could
* be changed independently by the filters later.
+ * Allow HTTP version 0.9 to 1.1.
+ * Downgrade http version > 1.1 <= 1.9 to version 1.1.
+ * Return HTTP Version Not Supported for anything else.
*/
- if ((desc->http_version =
- strdup(desc->http_version)) == NULL)
- goto fail;
+
+ version = http_version_num(http_version);
+
+ if (version == 0) {
+ server_abort_http(clt, 505, "bad http version");
+ goto abort;
+ } else if (version == 11) {
+ if ((desc->http_version =
+ strdup("HTTP/1.1")) == NULL)
+ goto fail;
+ } else {
+ if ((desc->http_version =
+ strdup(http_version)) == NULL)
+ goto fail;
+ }
if (desc->http_query != NULL &&
(desc->http_query =
