Add SASL password wrapper program + update SASL instructions in README

plugins/password/README

@@ -123,13 +123,13 @@
 
  Installation:
 
- Edit the chgsaslpasswd.c and chgsaslpasswd.sh files as is documented
+ Change into the drivers directory. Edit the chgsaslpasswd.c file as is
- within them.
+ documented within it.
 
  Compile the wrapper program:
 	gcc -o chgsaslpasswd chgsaslpasswd.c
 
- Chown the chgsaslpasswd and chgsaslpasswd.sh to the cyrus user and group
+ Chown the compiled chgsaslpasswd binary to the cyrus user and group
  that your browser runs as, then chmod them to 4550.
 
  For example, if your cyrus user is 'cyrus' and the apache server group is

plugins/password/drivers/chgsaslpasswd.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <unistd.h>
+
+// set the UID this script will run as (cyrus user)
+#define UID 96
+// set the path to saslpasswd or saslpasswd2
+#define CMD "/usr/sbin/saslpasswd2"
+
+/* INSTALLING:
+  gcc -o chgsaslpasswd chgsaslpasswd.c
+  chown root.apache chgsaslpasswd
+  strip chgsaslpasswd
+  chmod 4550 chgsaslpasswd
+*/
+
+main(int argc, char *argv[])
+{
+  int rc,cc;
+
+  cc = setuid(UID);
+  rc = execvp(CMD, argv);
+  if ((rc != 0) || (cc != 0))
+  {
+    fprintf(stderr,"__ %s:  failed %d  %d\n",argv[0],rc,cc);
+    exit(1);
+  }
+}