httpd: require "HTTP/xyz" at the end of request line

function                                             old     new   delta
handle_incoming_and_exit                            2379    2362     -17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-17)             Total: -17 bytes
   text	   data	    bss	    dec	    hex	filename
 981787	    485	   7296	 989568	  f1980	busybox_old
 981779	    485	   7296	 989560	  f1978	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 14 deletions

diff --git a/networking/httpd.c b/networking/httpd.c
index 0b5d2b481..f8a1e2556 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -2128,7 +2128,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
         smallint authorized = -1;
 #endif
-        char http_major_version;
         char *HTTP_slash;
 
         /* Allocation of iobuf is postponed until now
@@ -2191,16 +2190,12 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
         if (urlp[0] != '/')
                 send_headers_and_exit(HTTP_BAD_REQUEST);
 
-        /* Find end of URL and parse HTTP version, if any */
-//TODO: maybe just reject all queries which have no " HTTP/xyz" suffix?
-//Then 'http_major_version' can be deleted
-        http_major_version = ('0' - 1); /* "less than 0th" version */
-        HTTP_slash = strchrnul(urlp, ' ');
+        /* Find end of URL */
+        HTTP_slash = strchr(urlp, ' ');
         /* Is it " HTTP/"? */
-        if (HTTP_slash[0] && strncmp(HTTP_slash + 1, HTTP_200, 5) == 0) {
-                http_major_version = HTTP_slash[6];
-                *HTTP_slash++ = '\0';
-        }
+        if (!HTTP_slash || strncmp(HTTP_slash + 1, HTTP_200, 5) != 0)
+                send_headers_and_exit(HTTP_BAD_REQUEST);
+        *HTTP_slash++ = '\0';
 
         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
         urlcopy = alloca((HTTP_slash - urlp) + 2 + strlen(index_page));
@@ -2216,6 +2211,8 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
                 Htaccess_Proxy *proxy_entry = find_proxy_entry(urlcopy);
 
                 if (proxy_entry) {
+                        if (verbose > 1)
+                                bb_error_msg("proxy:%s", urlcopy);
                         lsa = host2sockaddr(proxy_entry->host_port, 80);
                         if (!lsa)
                                 send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
@@ -2233,7 +2230,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
                                         prequest, /* "GET" or "POST" */
                                         proxy_entry->url_to, /* "/new/path" */
                                         urlcopy + strlen(proxy_entry->url_from), /* "SFX" */
-                                        HTTP_slash /* HTTP/xyz" or "" */
+                                        HTTP_slash /* "HTTP/xyz" */
                         );
                         cgi_io_loop_and_exit(proxy_fd, proxy_fd, /*max POST length:*/ INT_MAX);
                 }
@@ -2366,8 +2363,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
 #if ENABLE_FEATURE_HTTPD_CGI
         total_headers_len = 0;
 #endif
-        if (http_major_version >= '0') {
-                /* Request was with "... HTTP/nXXX", and n >= 0 */
 
                 /* Read until blank line */
                 while (1) {
@@ -2484,7 +2479,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
                         }
 #endif
                 } /* while extra header reading */
-        }
 
         /* We are done reading headers, disable peer timeout */
         alarm(0);