X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurityd/lib/sec_xdr_array.c

diff --git a/Security/libsecurityd/lib/sec_xdr_array.c b/Security/libsecurityd/lib/sec_xdr_array.c
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+/*
+ * Copyright (c) 2006,2011,2013-2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*    $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $    */
+
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ *
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ *
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California  94043
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *sccsid = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
+static char *sccsid = "@(#)xdr_array.c    2.1 88/07/29 4.0 RPCSRC";
+#endif
+#include <sys/cdefs.h>
+
+/*
+ * xdr_array.c, Generic XDR routines impelmentation.
+ *
+ * Copyright (C) 1984, Sun Microsystems, Inc.
+ *
+ * These are the "non-trivial" xdr primitives used to serialize and de-serialize
+ * arrays.  See xdr.h for more info on the interface to xdr.
+ */
+
+#include <err.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "sec_xdr.h"
+
+/*
+ * XDR an array of arbitrary elements
+ * *addrp is a pointer to the array, *sizep is the number of elements.
+ * If addrp is NULL (*sizep * elsize) bytes are allocated.
+ * elsize is the size (in bytes) of each element, and elproc is the
+ * xdr procedure to call to handle each element of the array.
+ */
+bool_t
+sec_xdr_array(XDR *xdrs, uint8_t **addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
+{
+    u_int i;
+    bool_t stat = TRUE;
+    
+    u_int c = sizep ? *sizep : 0;  /* the actual element count */
+    /* like strings, arrays are really counted arrays */
+    if (!xdr_u_int(xdrs, &c))
+        return (FALSE);
+
+    if (sizep && (xdrs->x_op == XDR_DECODE))
+        *sizep = c;
+        
+    // XXX/cs on decode if c == 0 return
+
+    if ((c > maxsize || UINT_MAX/elsize < c) && (xdrs->x_op != XDR_FREE))
+        return (FALSE);
+
+    if (elsize > 1024) {
+        // Structure suspiciously large: 1024 is arbitrary upper bound
+        // for struct sizes (non-nested size)
+        assert(FALSE);
+        return (FALSE);
+    }
+    
+    u_int nodesize = c * elsize;
+    uint8_t *target = addrp ? *addrp : NULL;
+
+    uint8_t obj[elsize];
+
+    bool_t sizeof_alloc = sec_xdr_arena_size_allocator(xdrs);
+
+    /*
+     * if we are deserializing, we may need to allocate an array.
+     * We also save time by checking for a null array if we are freeing.
+     */
+    if (target == NULL) {
+        switch (xdrs->x_op) {
+        case XDR_DECODE:
+            if (c == 0)
+                return (TRUE);
+			if (!sec_mem_alloc(xdrs, nodesize, &target))
+				return (FALSE);
+			if (!target)
+				target = &obj[0];
+            if (!sizeof_alloc)
+				*addrp = target;
+            break;
+
+        case XDR_FREE:
+            return (TRUE);
+
+        case XDR_ENCODE:
+            break;
+        }
+    }
+	
+    /*
+     * now we xdr each element of array
+     */
+    for (i = 0; (i < c) && stat; i++) {
+        if ((xdrs->x_op == XDR_DECODE) && sizeof_alloc)
+            memset(obj, 0, elsize);
+        stat = (*elproc)(xdrs, target, 0);
+        if ((xdrs->x_op == XDR_ENCODE) || !sizeof_alloc)
+            target += elsize;
+    }
+
+    /*
+     * the array may need freeing
+     */
+    if (xdrs->x_op == XDR_FREE) {
+        sec_mem_free(xdrs, *addrp, nodesize);
+        *addrp = NULL;
+    }
+    return (stat);
+}
+
+/**
+ * This is almost a straight copy of the standard implementation, except
+ * that all calls made that allocate memory can defer to an alternate 
+ * mechanism, with the purpose to allocate from one block of memory on
+ * *decode*
+ */