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/*
* linux/net/sunrpc/gss_krb5_crypto.c
*
* Copyright (c) 2000 The Regents of the University of Michigan.
* All rights reserved.
*
* Andy Adamson <andros@umich.edu>
* Bruce Fields <bfields@umich.edu>
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/gss_krb5.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
u32
krb5_encrypt(
struct crypto_tfm *tfm,
void * iv,
void * in,
void * out,
int length)
{
u32 ret = -EINVAL;
struct scatterlist sg[1];
u8 local_iv[16] = {0};
dprintk("RPC: krb5_encrypt: input data:\n");
print_hexl((u32 *)in, length, 0);
if (length % crypto_tfm_alg_blocksize(tfm) != 0)
goto out;
if (crypto_tfm_alg_ivsize(tfm) > 16) {
dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n",
crypto_tfm_alg_ivsize(tfm));
goto out;
}
if (iv)
memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm));
memcpy(out, in, length);
sg[0].page = virt_to_page(out);
sg[0].offset = offset_in_page(out);
sg[0].length = length;
ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv);
dprintk("RPC: krb5_encrypt: output data:\n");
print_hexl((u32 *)out, length, 0);
out:
dprintk("RPC: krb5_encrypt returns %d\n",ret);
return(ret);
}
EXPORT_SYMBOL(krb5_encrypt);
u32
krb5_decrypt(
struct crypto_tfm *tfm,
void * iv,
void * in,
void * out,
int length)
{
u32 ret = -EINVAL;
struct scatterlist sg[1];
u8 local_iv[16] = {0};
dprintk("RPC: krb5_decrypt: input data:\n");
print_hexl((u32 *)in, length, 0);
if (length % crypto_tfm_alg_blocksize(tfm) != 0)
goto out;
if (crypto_tfm_alg_ivsize(tfm) > 16) {
dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n",
crypto_tfm_alg_ivsize(tfm));
goto out;
}
if (iv)
memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm));
memcpy(out, in, length);
sg[0].page = virt_to_page(out);
sg[0].offset = offset_in_page(out);
sg[0].length = length;
ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv);
dprintk("RPC: krb5_decrypt: output_data:\n");
print_hexl((u32 *)out, length, 0);
out:
dprintk("RPC: gss_k5decrypt returns %d\n",ret);
return(ret);
}
EXPORT_SYMBOL(krb5_decrypt);
static void
buf_to_sg(struct scatterlist *sg, char *ptr, int len) {
sg->page = virt_to_page(ptr);
sg->offset = offset_in_page(ptr);
sg->length = len;
}
static int
process_xdr_buf(struct xdr_buf *buf, int offset, int len,
int (*actor)(struct scatterlist *, void *), void *data)
{
int i, page_len, thislen, page_offset, ret = 0;
struct scatterlist sg[1];
if (offset >= buf->head[0].iov_len) {
offset -= buf->head[0].iov_len;
} else {
thislen = buf->head[0].iov_len - offset;
if (thislen > len)
thislen = len;
buf_to_sg(sg, buf->head[0].iov_base + offset, thislen);
ret = actor(sg, data);
if (ret)
goto out;
offset = 0;
len -= thislen;
}
if (len == 0)
goto out;
if (offset >= buf->page_len) {
offset -= buf->page_len;
} else {
page_len = buf->page_len - offset;
if (page_len > len)
page_len = len;
len -= page_len;
page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
thislen = PAGE_CACHE_SIZE - page_offset;
do {
if (thislen > page_len)
thislen = page_len;
sg->page = buf->pages[i];
sg->offset = page_offset;
sg->length = thislen;
ret = actor(sg, data);
if (ret)
goto out;
page_len -= thislen;
i++;
page_offset = 0;
thislen = PAGE_CACHE_SIZE;
} while (page_len != 0);
offset = 0;
}
if (len == 0)
goto out;
if (offset < buf->tail[0].iov_len) {
thislen = buf->tail[0].iov_len - offset;
if (thislen > len)
thislen = len;
buf_to_sg(sg, buf->tail[0].iov_base + offset, thislen);
ret = actor(sg, data);
len -= thislen;
}
if (len != 0)
ret = -EINVAL;
out:
return ret;
}
static int
checksummer(struct scatterlist *sg, void *data)
{
struct crypto_tfm *tfm = (struct crypto_tfm *)data;
crypto_digest_update(tfm, sg, 1);
return 0;
}
/* checksum the plaintext data and hdrlen bytes of the token header */
s32
make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
struct xdr_netobj *cksum)
{
char *cksumname;
struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */
struct scatterlist sg[1];
u32 code = GSS_S_FAILURE;
switch (cksumtype) {
case CKSUMTYPE_RSA_MD5:
cksumname = "md5";
break;
default:
dprintk("RPC: krb5_make_checksum:"
" unsupported checksum %d", cksumtype);
goto out;
}
if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP)))
goto out;
cksum->len = crypto_tfm_alg_digestsize(tfm);
if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL)
goto out;
crypto_digest_init(tfm);
buf_to_sg(sg, header, hdrlen);
crypto_digest_update(tfm, sg, 1);
process_xdr_buf(body, 0, body->len, checksummer, tfm);
crypto_digest_final(tfm, cksum->data);
code = 0;
out:
crypto_free_tfm(tfm);
return code;
}
EXPORT_SYMBOL(make_checksum);
|
