mod_auth_ldap: Handle the inconsistent way in which the MS LDAP

library handles special characters.
PR:	24437
Obtained from:
Submitted by:	Jess Holle
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105379 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 33 insertions, 5 deletions

diff --git a/modules/aaa/mod_authnz_ldap.c b/modules/aaa/mod_authnz_ldap.c
index 88b7da389e..226aee94af 100644
--- a/modules/aaa/mod_authnz_ldap.c
+++ b/modules/aaa/mod_authnz_ldap.c
@@ -207,19 +207,47 @@ static void authn_ldap_build_filter(char *filtbuf,
      * LDAP filter metachars are escaped.
      */
     filtbuf_end = filtbuf + FILTER_LENGTH - 1;
-    for (p = user, q=filtbuf + strlen(filtbuf);
-         *p && q < filtbuf_end; *q++ = *p++) {
 #if APR_HAS_MICROSOFT_LDAPSDK
-        /* Note: The Microsoft SDK escapes for us, so is not necessary */
+    for (p = user, q=filtbuf + strlen(filtbuf);
+         *p && q < filtbuf_end; ) {
+        if (strchr("*()\\", *p) != NULL) {
+            if ( q + 3 >= filtbuf_end)
+              break;  /* Don't write part of escape sequence if we can't write all of it */
+            *q++ = '\\';
+            switch ( *p++ )
+            {
+              case '*':
+                *q++ = '2';
+                *q++ = 'a';
+                break;
+              case '(':
+                *q++ = '2';
+                *q++ = '8';
+                break;
+              case ')':
+                *q++ = '2';
+                *q++ = '9';
+                break;
+              case '\\':
+                *q++ = '5';
+                *q++ = 'c';
+                break;
+		        }
+        }
+        else
+            *q++ = *p++;
+    }
 #else
+    for (p = user, q=filtbuf + strlen(filtbuf);
+         *p && q < filtbuf_end; *q++ = *p++) {
         if (strchr("*()\\", *p) != NULL) {
             *q++ = '\\';
             if (q >= filtbuf_end) {
-                break;
+              break;
             }
         }
-#endif
     }
+#endif
     *q = '\0';
 
     /*