2005-04-16 16:20:36 -06:00
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/*
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* linux/net/sunrpc/gss_krb5_crypto.c
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*
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* Copyright (c) 2000 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@umich.edu>
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* Bruce Fields <bfields@umich.edu>
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*/
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/*
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* Copyright (C) 1998 by the FundsXpress, INC.
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*
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* All rights reserved.
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*
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* Export of this software from the United States of America may require
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* a specific license from the United States Government. It is the
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* responsibility of any person or organization contemplating export to
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* obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of FundsXpress. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. FundsXpress makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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2005-09-17 01:55:31 -06:00
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#include <linux/scatterlist.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/crypto.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/sunrpc/gss_krb5.h>
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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u32
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krb5_encrypt(
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struct crypto_tfm *tfm,
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void * iv,
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void * in,
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void * out,
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int length)
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{
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u32 ret = -EINVAL;
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struct scatterlist sg[1];
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u8 local_iv[16] = {0};
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dprintk("RPC: krb5_encrypt: input data:\n");
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print_hexl((u32 *)in, length, 0);
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if (length % crypto_tfm_alg_blocksize(tfm) != 0)
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goto out;
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if (crypto_tfm_alg_ivsize(tfm) > 16) {
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dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n",
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crypto_tfm_alg_ivsize(tfm));
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goto out;
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}
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if (iv)
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memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm));
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memcpy(out, in, length);
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2005-09-17 01:55:31 -06:00
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sg_set_buf(&sg[0], out, length);
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2005-04-16 16:20:36 -06:00
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ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv);
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dprintk("RPC: krb5_encrypt: output data:\n");
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print_hexl((u32 *)out, length, 0);
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out:
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dprintk("RPC: krb5_encrypt returns %d\n",ret);
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return(ret);
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}
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EXPORT_SYMBOL(krb5_encrypt);
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u32
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krb5_decrypt(
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struct crypto_tfm *tfm,
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void * iv,
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void * in,
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void * out,
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int length)
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{
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u32 ret = -EINVAL;
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struct scatterlist sg[1];
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u8 local_iv[16] = {0};
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dprintk("RPC: krb5_decrypt: input data:\n");
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print_hexl((u32 *)in, length, 0);
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if (length % crypto_tfm_alg_blocksize(tfm) != 0)
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goto out;
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if (crypto_tfm_alg_ivsize(tfm) > 16) {
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dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n",
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crypto_tfm_alg_ivsize(tfm));
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goto out;
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}
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if (iv)
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memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm));
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memcpy(out, in, length);
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2005-09-17 01:55:31 -06:00
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sg_set_buf(&sg[0], out, length);
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2005-04-16 16:20:36 -06:00
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ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv);
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dprintk("RPC: krb5_decrypt: output_data:\n");
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print_hexl((u32 *)out, length, 0);
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out:
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dprintk("RPC: gss_k5decrypt returns %d\n",ret);
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return(ret);
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}
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EXPORT_SYMBOL(krb5_decrypt);
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2005-10-13 14:55:03 -06:00
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static int
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process_xdr_buf(struct xdr_buf *buf, int offset, int len,
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int (*actor)(struct scatterlist *, void *), void *data)
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{
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int i, page_len, thislen, page_offset, ret = 0;
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struct scatterlist sg[1];
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if (offset >= buf->head[0].iov_len) {
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offset -= buf->head[0].iov_len;
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} else {
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thislen = buf->head[0].iov_len - offset;
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if (thislen > len)
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thislen = len;
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2005-09-17 01:55:31 -06:00
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sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
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2005-10-13 14:55:03 -06:00
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ret = actor(sg, data);
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if (ret)
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goto out;
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offset = 0;
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len -= thislen;
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}
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if (len == 0)
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goto out;
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if (offset >= buf->page_len) {
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offset -= buf->page_len;
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} else {
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page_len = buf->page_len - offset;
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if (page_len > len)
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page_len = len;
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len -= page_len;
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page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
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i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
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thislen = PAGE_CACHE_SIZE - page_offset;
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do {
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if (thislen > page_len)
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thislen = page_len;
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sg->page = buf->pages[i];
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sg->offset = page_offset;
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sg->length = thislen;
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ret = actor(sg, data);
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if (ret)
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goto out;
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page_len -= thislen;
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i++;
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page_offset = 0;
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thislen = PAGE_CACHE_SIZE;
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} while (page_len != 0);
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offset = 0;
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}
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if (len == 0)
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goto out;
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if (offset < buf->tail[0].iov_len) {
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thislen = buf->tail[0].iov_len - offset;
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if (thislen > len)
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thislen = len;
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2005-09-17 01:55:31 -06:00
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sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
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2005-10-13 14:55:03 -06:00
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ret = actor(sg, data);
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len -= thislen;
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}
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if (len != 0)
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ret = -EINVAL;
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out:
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return ret;
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}
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static int
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checksummer(struct scatterlist *sg, void *data)
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{
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struct crypto_tfm *tfm = (struct crypto_tfm *)data;
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crypto_digest_update(tfm, sg, 1);
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return 0;
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}
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2005-04-16 16:20:36 -06:00
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/* checksum the plaintext data and hdrlen bytes of the token header */
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s32
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make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
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2005-10-13 14:55:13 -06:00
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int body_offset, struct xdr_netobj *cksum)
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2005-04-16 16:20:36 -06:00
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{
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char *cksumname;
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struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */
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struct scatterlist sg[1];
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u32 code = GSS_S_FAILURE;
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switch (cksumtype) {
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case CKSUMTYPE_RSA_MD5:
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cksumname = "md5";
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break;
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default:
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dprintk("RPC: krb5_make_checksum:"
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" unsupported checksum %d", cksumtype);
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goto out;
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}
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2005-09-01 18:43:25 -06:00
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if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP)))
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2005-04-16 16:20:36 -06:00
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goto out;
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cksum->len = crypto_tfm_alg_digestsize(tfm);
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if ((cksum->data = kmalloc(cksum->len, GFP_KERNEL)) == NULL)
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goto out;
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crypto_digest_init(tfm);
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2005-09-17 01:55:31 -06:00
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sg_set_buf(sg, header, hdrlen);
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2005-04-16 16:20:36 -06:00
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crypto_digest_update(tfm, sg, 1);
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2005-10-13 14:55:13 -06:00
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process_xdr_buf(body, body_offset, body->len - body_offset,
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checksummer, tfm);
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2005-04-16 16:20:36 -06:00
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crypto_digest_final(tfm, cksum->data);
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code = 0;
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out:
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2005-09-01 18:44:29 -06:00
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crypto_free_tfm(tfm);
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2005-04-16 16:20:36 -06:00
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return code;
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}
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EXPORT_SYMBOL(make_checksum);
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2005-10-13 14:55:13 -06:00
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struct encryptor_desc {
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u8 iv[8]; /* XXX hard-coded blocksize */
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struct crypto_tfm *tfm;
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int pos;
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struct xdr_buf *outbuf;
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struct page **pages;
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struct scatterlist infrags[4];
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struct scatterlist outfrags[4];
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int fragno;
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int fraglen;
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};
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static int
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encryptor(struct scatterlist *sg, void *data)
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{
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struct encryptor_desc *desc = data;
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struct xdr_buf *outbuf = desc->outbuf;
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struct page *in_page;
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int thislen = desc->fraglen + sg->length;
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int fraglen, ret;
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int page_pos;
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/* Worst case is 4 fragments: head, end of page 1, start
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* of page 2, tail. Anything more is a bug. */
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BUG_ON(desc->fragno > 3);
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desc->infrags[desc->fragno] = *sg;
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desc->outfrags[desc->fragno] = *sg;
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page_pos = desc->pos - outbuf->head[0].iov_len;
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if (page_pos >= 0 && page_pos < outbuf->page_len) {
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/* pages are not in place: */
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int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT;
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in_page = desc->pages[i];
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} else {
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in_page = sg->page;
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}
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desc->infrags[desc->fragno].page = in_page;
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desc->fragno++;
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desc->fraglen += sg->length;
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desc->pos += sg->length;
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fraglen = thislen & 7; /* XXX hardcoded blocksize */
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thislen -= fraglen;
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if (thislen == 0)
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return 0;
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ret = crypto_cipher_encrypt_iv(desc->tfm, desc->outfrags, desc->infrags,
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thislen, desc->iv);
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if (ret)
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return ret;
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if (fraglen) {
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desc->outfrags[0].page = sg->page;
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desc->outfrags[0].offset = sg->offset + sg->length - fraglen;
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desc->outfrags[0].length = fraglen;
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desc->infrags[0] = desc->outfrags[0];
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desc->infrags[0].page = in_page;
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desc->fragno = 1;
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desc->fraglen = fraglen;
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} else {
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desc->fragno = 0;
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desc->fraglen = 0;
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}
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return 0;
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}
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int
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gss_encrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset,
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struct page **pages)
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{
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int ret;
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struct encryptor_desc desc;
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BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0);
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memset(desc.iv, 0, sizeof(desc.iv));
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desc.tfm = tfm;
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desc.pos = offset;
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desc.outbuf = buf;
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desc.pages = pages;
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desc.fragno = 0;
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desc.fraglen = 0;
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ret = process_xdr_buf(buf, offset, buf->len - offset, encryptor, &desc);
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return ret;
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}
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EXPORT_SYMBOL(gss_encrypt_xdr_buf);
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struct decryptor_desc {
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u8 iv[8]; /* XXX hard-coded blocksize */
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struct crypto_tfm *tfm;
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|
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struct scatterlist frags[4];
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int fragno;
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int fraglen;
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};
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|
static int
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|
|
decryptor(struct scatterlist *sg, void *data)
|
|
|
|
{
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|
|
struct decryptor_desc *desc = data;
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int thislen = desc->fraglen + sg->length;
|
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|
|
int fraglen, ret;
|
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|
|
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/* Worst case is 4 fragments: head, end of page 1, start
|
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|
|
* of page 2, tail. Anything more is a bug. */
|
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|
|
BUG_ON(desc->fragno > 3);
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|
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desc->frags[desc->fragno] = *sg;
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|
|
desc->fragno++;
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|
|
desc->fraglen += sg->length;
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|
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|
fraglen = thislen & 7; /* XXX hardcoded blocksize */
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thislen -= fraglen;
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|
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|
|
if (thislen == 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
ret = crypto_cipher_decrypt_iv(desc->tfm, desc->frags, desc->frags,
|
|
|
|
thislen, desc->iv);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
if (fraglen) {
|
|
|
|
desc->frags[0].page = sg->page;
|
|
|
|
desc->frags[0].offset = sg->offset + sg->length - fraglen;
|
|
|
|
desc->frags[0].length = fraglen;
|
|
|
|
desc->fragno = 1;
|
|
|
|
desc->fraglen = fraglen;
|
|
|
|
} else {
|
|
|
|
desc->fragno = 0;
|
|
|
|
desc->fraglen = 0;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
gss_decrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset)
|
|
|
|
{
|
|
|
|
struct decryptor_desc desc;
|
|
|
|
|
|
|
|
/* XXXJBF: */
|
|
|
|
BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0);
|
|
|
|
|
|
|
|
memset(desc.iv, 0, sizeof(desc.iv));
|
|
|
|
desc.tfm = tfm;
|
|
|
|
desc.fragno = 0;
|
|
|
|
desc.fraglen = 0;
|
|
|
|
return process_xdr_buf(buf, offset, buf->len - offset, decryptor, &desc);
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(gss_decrypt_xdr_buf);
|