+/*
+ * Copyright (c) 2006,2011-2014 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@
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "sec_xdr.h"
+
+#define ALIGNMENT sizeof(void*)
+#define ALIGNUP(LEN) (((LEN - 1) & ~(ALIGNMENT - 1)) + ALIGNMENT)
+
+/*
+ * XDR counted bytes
+ * *cpp is a pointer to the bytes, *sizep is the count.
+ * If *cpp is NULL maxsize bytes are allocated
+ */
+bool_t sec_xdr_bytes(XDR *xdrs, uint8_t **cpp, u_int *sizep, u_int maxsize)
+{
+ uint8_t *sp = cpp ? *cpp : NULL; /* sp is the actual string pointer */
+ u_int nodesize = sizep ? *sizep : 0;
+
+ /*
+ * first deal with the length since xdr bytes are counted
+ */
+ if (! xdr_u_int(xdrs, &nodesize))
+ return (FALSE);
+
+ if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE))
+ return (FALSE);
+
+ if (sizep && (xdrs->x_op == XDR_DECODE))
+ *sizep = nodesize;
+
+ bool_t sizeof_alloc = sec_xdr_arena_size_allocator(xdrs);
+
+ /*
+ * now deal with the actual bytes
+ */
+ switch (xdrs->x_op) {
+ case XDR_DECODE:
+ if (nodesize == 0)
+ return (TRUE);
+ if (!sp) {
+ if (!sec_mem_alloc(xdrs, nodesize, &sp))
+ return (FALSE);
+ if (!sizeof_alloc)
+ *cpp = sp; /* sp can be NULL when counting required space */
+ }
+ /* FALLTHROUGH */
+ case XDR_ENCODE:
+ return (xdr_opaque(xdrs, (char *)sp, nodesize));
+
+ case XDR_FREE:
+ if (sp != NULL) {
+ sec_mem_free(xdrs, sp, nodesize);
+ *cpp = NULL;
+ }
+ return (TRUE);
+ }
+ /* NOTREACHED */
+ return (FALSE);
+}
+
+bool_t sec_xdr_charp(XDR *xdrs, char **cpp, u_int maxsize)
+{
+ char *sp = cpp ? *cpp : NULL; /* sp is the actual string pointer */
+ u_int size = 0;
+
+ switch (xdrs->x_op) {
+ case XDR_FREE:
+ if (sp == NULL) return(TRUE); /* already free */
+ sec_mem_free(xdrs, sp, size);
+ *cpp = NULL;
+ return (TRUE);
+ case XDR_ENCODE:
+ if (sp) size = (u_int)(strlen(sp) + 1);
+ /* FALLTHROUGH */
+ case XDR_DECODE:
+ return sec_xdr_bytes(xdrs, (uint8_t**)cpp, &size, maxsize);
+ }
+ /* NOTREACHED */
+ return (FALSE);
+}
+
+bool_t sec_mem_alloc(XDR *xdr, u_int bsize, uint8_t **data)
+{
+ if (!xdr || !data)
+ return (FALSE);
+
+ assert(xdr->x_op == XDR_DECODE);
+
+ sec_xdr_arena_allocator_t *allocator = sec_xdr_arena_allocator(xdr);
+ if (allocator) {
+ if (*data != NULL)
+ return (TRUE); // no allocation needed
+ size_t bytes_left;
+ switch(allocator->magic) {
+ case xdr_arena_magic:
+ bytes_left = allocator->end - allocator->offset;
+ if (bsize > bytes_left)
+ return (FALSE);
+ else {
+ uint8_t *temp = allocator->offset;
+ allocator->offset += bsize;
+ *data = temp;
+ return (TRUE);
+ }
+ case xdr_size_magic:
+ allocator->offset = (uint8_t*)((size_t)allocator->offset + bsize);
+ return (TRUE);
+ }
+ }
+
+ void *alloc = calloc(1, bsize);
+ if (!alloc)
+ return (FALSE);
+
+ *data = alloc;
+ return (TRUE);
+}
+
+void sec_mem_free(XDR *xdr, void *ptr, u_int bsize)
+{
+ if (sec_xdr_arena_allocator(xdr))
+ return;
+
+ return free(ptr);
+}
+
+static const sec_xdr_arena_allocator_t size_alloc = { xdr_size_magic, 0, 0, 0 };
+void sec_xdr_arena_init_size_alloc(sec_xdr_arena_allocator_t *arena, XDR *xdr)
+{
+ memcpy(arena, &size_alloc, sizeof(size_alloc));
+ xdr->x_public = (char *)arena;
+}
+
+bool_t sec_xdr_arena_init(sec_xdr_arena_allocator_t *arena, XDR *xdr,
+ size_t in_length, uint8_t *in_data)
+{
+ if (!xdr)
+ return FALSE;
+ uint8_t *data = in_data ? in_data : calloc(1, ALIGNUP(in_length));
+ if (!data)
+ return FALSE;
+ arena->magic = xdr_arena_magic;
+ arena->offset = data;
+ arena->data = data;
+ arena->end = data + in_length;
+ xdr->x_public = (void*)arena;
+ return TRUE;
+}
+
+void sec_xdr_arena_free(sec_xdr_arena_allocator_t *arena,
+ void *ptr, size_t bsize)
+{
+ assert(arena->magic == xdr_arena_magic);
+ free(arena->data);
+}
+
+void *sec_xdr_arena_data(sec_xdr_arena_allocator_t *arena)
+{
+ if (arena)
+ return arena->data;
+
+ return NULL;
+}
+
+sec_xdr_arena_allocator_t *sec_xdr_arena_allocator(XDR *xdr)
+{
+ sec_xdr_arena_allocator_t *allocator = xdr ? (sec_xdr_arena_allocator_t *)xdr->x_public : NULL;
+
+ if (allocator &&
+ (allocator->magic == xdr_arena_magic ||
+ allocator->magic == xdr_size_magic))
+ return allocator;
+
+ return NULL;
+}
+
+bool_t sec_xdr_arena_size_allocator(XDR *xdr)
+{
+ sec_xdr_arena_allocator_t *allocator = xdr ? (sec_xdr_arena_allocator_t *)xdr->x_public : NULL;
+ if (allocator && (allocator->magic == xdr_size_magic))
+ return TRUE;
+
+ return FALSE;
+}
+
+
+bool_t copyin(void *data, xdrproc_t proc, void** copy, u_int *size)
+{
+ if (!copy)
+ return (FALSE);
+
+ // xdr_sizeof is illbehaved
+ u_int length = sec_xdr_sizeof_in(proc, data);
+ uint8_t *xdr_data = malloc(length);
+ if (!xdr_data)
+ return (FALSE);
+
+ XDR xdr;
+ sec_xdrmem_create(&xdr, (char *)xdr_data, length, XDR_ENCODE);
+
+ // cast to void* - function can go both ways (xdr->x_op)
+ if (proc(&xdr, data, 0)) {
+ *copy = xdr_data;
+ if (size) *size = length;
+ return (TRUE);
+ }
+
+ free(xdr_data);
+ return (FALSE);
+}
+
+// Unmarshall xdr data and return pointer to single allocation containing data
+// Generally use *_PTR for xdrproc_t taking an objp that matches data's type
+// ie. xdr_CSSM_POSSIBLY_KEY_IN_DATA_PTR(XDR *xdrs, CSSM_DATA_PTR *objp)
+// with data matching objp
+// If you pass in length pointing to a non-zero value, data will be assumed
+// to have pre-allocated space for use by copyout in that amount.
+// If *data is not NULL it will be assumed to be allocated already.
+bool_t copyout(const void *copy, u_int size, xdrproc_t proc, void **data, u_int *length)
+{
+
+ if (!data || (size > ~(u_int)0))
+ return (FALSE);
+
+ XDR xdr;
+ sec_xdrmem_create(&xdr, (void *)copy, size, XDR_DECODE);
+
+ u_int length_required = sec_xdr_sizeof_out(copy, size, proc, data);
+ u_int length_out = length ? *length : 0;
+
+ if (length_out && (length_required > length_out))
+ return (FALSE);
+
+ bool_t passed_in_data = (*data && length_out);
+ sec_xdr_arena_allocator_t arena;
+ // set up arena with memory passed in (length_out > 0) or ask to allocate
+ if (!sec_xdr_arena_init(&arena, &xdr, length_out ? length_out : length_required, length_out ? *data : NULL))
+ return (FALSE);
+
+ if (proc(&xdr, data, 0))
+ {
+ *length = length_required;
+ return (TRUE);
+ }
+
+ if (!passed_in_data)
+ sec_xdr_arena_free(sec_xdr_arena_allocator(&xdr), NULL, 0);
+ return (FALSE);
+}
+
+// unmarshall xdr data and return pointer to individual allocations containing data
+// only use *_PTR for xdrproc_ts and pointers for data
+bool_t copyout_chunked(const void *copy, u_int size, xdrproc_t proc, void **data)
+{
+ if (!data || (size > ~(u_int)0))
+ return (FALSE);
+
+ XDR xdr;
+ sec_xdrmem_create(&xdr, (void *)copy, size, XDR_DECODE);
+
+ void *data_out = NULL;
+
+ if (proc(&xdr, &data_out, 0))
+ {
+ *data = data_out;
+ return (TRUE);
+ }
+ return (FALSE);
+}
projects / apple / security.git / blobdiff