Hi all,
I have put together a patch for supporting "Basic" HTTP
Proxy Authentication. The patch changes the interpretation
of the RSYNC_PROXY environment variable so that the syntax
user:pass@proxy.foo:port
may be used instead of just
proxy.foo:port
(the old syntax is of course still supported).
The patch has only been tested lightly, but it should(TM)
work.
The patch (and future versions of it) is available at:
http://www.imada.sdu.dk/~bardur/personal/patches.html
(and i've attached the rsync-2.5.5 version). Any comments
and suggestions are welcome, but please CC them to my
email, as I am not a member of the list.
--
Bardur Arantsson
<bardur@imada.sdu.dk>
<bardur@odense.kollegienet.dk>
- "Information wants to be tied up and spanked..."
- Faulty Dreamer on kuro5hin.org
-------------- next part --------------
diff -u rsync-2.5.5.orig/authenticate.c rsync-2.5.5/authenticate.c
--- rsync-2.5.5.orig/authenticate.c 2002-01-24 03:33:45.000000000 +0100
+++ rsync-2.5.5/authenticate.c 2002-04-04 12:32:58.000000000 +0200
@@ -24,7 +24,7 @@
encode a buffer using base64 - simple and slow algorithm. null terminates
the result.
***************************************************************************/
-static void base64_encode(char *buf, int len, char *out)
+void base64_encode(char *buf, int len, char *out)
{
char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int bit_offset, byte_offset, idx, i;
diff -u rsync-2.5.5.orig/socket.c rsync-2.5.5/socket.c
--- rsync-2.5.5.orig/socket.c 2002-03-16 10:00:44.000000000 +0100
+++ rsync-2.5.5/socket.c 2002-04-04 12:32:58.000000000 +0200
@@ -33,15 +33,52 @@
#include "rsync.h"
+/* declare the base64_encode function from authenticate.c */
+void base64_encode(char *buf, int len, char *out);
-/* Establish a proxy connection on an open socket to a web roxy by
- * using the CONNECT method. */
-static int establish_proxy_connection(int fd, char *host, int port)
+/* Establish a proxy connection on an open socket to a web proxy by
+ * using the CONNECT method. If proxy_user and proxy_pass are not NULL,
+ * they are used to authenticate to the proxy using the "Basic"
+ * proxy authorization protocol */
+static int establish_proxy_connection(int fd, char *host, int port,
+ char *proxy_user, char *proxy_pass)
{
char buffer[1024];
+ char authbuf[1024];
+ size_t authlen;
char *cp;
- snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n",
host, port);
+ /* use the proxy_user and proxy_pass
+ * variables to determine authentication string */
+ if ((proxy_user != NULL) &&
+ (proxy_pass != NULL)) {
+ /* copy "user:pass" into buffer */
+ strlcpy(buffer, proxy_user, sizeof(buffer));
+ strlcat(buffer, ":", sizeof(buffer));
+ strlcat(buffer, proxy_pass, sizeof(buffer));
+
+ /* how long will the base64 encoded string be? */
+ authlen = (strlen(buffer)*8 + 5)/6;
+ if (authlen>sizeof(authbuf)+1) {
+ rprintf(FERROR,
+ "authentication information too long\n");
+ return -1;
+ }
+
+ /* encode in base64 into authbuf */
+ base64_encode(buffer, strlen(buffer), authbuf);
+
+ /* request */
+ snprintf(buffer, sizeof(buffer),
+ "CONNECT %s:%d HTTP/1.0\r\n"
+ "Proxy-Authorization: Basic %s\r\n\r\n",
+ host, port, authbuf);
+ } else {
+ /* request */
+ snprintf(buffer, sizeof(buffer),
+ "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port);
+ }
+
if (write(fd, buffer, strlen(buffer)) != (int) strlen(buffer)) {
rprintf(FERROR, "failed to write to proxy: %s\n",
strerror(errno));
@@ -166,6 +203,9 @@
int proxied = 0;
char buffer[1024];
char *cp;
+ char *proxy_user = NULL;
+ char *proxy_pass = NULL;
+ char *buffer_hostpart;
/* if we have a RSYNC_PROXY env variable then redirect our
* connetcion via a web proxy at the given address. The format
@@ -175,7 +215,34 @@
if (proxied) {
strlcpy(buffer, h, sizeof(buffer));
- cp = strchr(buffer, ':');
+
+ /* authentication information present? */
+ cp = strchr(buffer, '@');
+ if (cp != NULL) {
+ /* rest of buffer points past the '@' */
+ buffer_hostpart = cp+1;
+ /* null separate auth portion from host:port */
+ *cp = '\0';
+ /* find a ':' in the auth portion */
+ cp = strchr(buffer, ':');
+ if (cp == NULL) {
+ rprintf(FERROR,
+ "invalid proxy specification: should be USER:PASS@HOST:PORT\n");
+ return -1;
+ };
+
+ /* null separate USER from PASS */
+ *cp++ = '\0';
+
+ /* set up pointers to USER and PASS */
+ proxy_user = buffer;
+ proxy_pass = cp;
+ } else {
+ /* whole buffer is the host part */
+ buffer_hostpart = buffer;
+ }
+
+ cp = strchr(buffer_hostpart, ':');
if (cp == NULL) {
rprintf(FERROR,
"invalid proxy specification: should be HOST:PORT\n");
@@ -183,7 +250,7 @@
}
*cp++ = '\0';
strcpy(portbuf, cp);
- h = buffer;
+ h = buffer_hostpart;
if (verbose >= 2) {
rprintf(FINFO, "connection via http proxy %s port %s\n",
h, portbuf);
@@ -227,7 +294,8 @@
continue;
}
if (proxied &&
- establish_proxy_connection(s, host, port) != 0) {
+ establish_proxy_connection(s, host, port,
+ proxy_user, proxy_pass) != 0) {
close(s);
s = -1;
continue;