1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
209 lines
5.4 KiB
C
209 lines
5.4 KiB
C
/*
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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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#include <asm/scatterlist.h>
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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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sg[0].page = virt_to_page(out);
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sg[0].offset = offset_in_page(out);
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sg[0].length = length;
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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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sg[0].page = virt_to_page(out);
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sg[0].offset = offset_in_page(out);
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sg[0].length = length;
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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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static void
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buf_to_sg(struct scatterlist *sg, char *ptr, int len) {
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sg->page = virt_to_page(ptr);
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sg->offset = offset_in_page(ptr);
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sg->length = len;
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}
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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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struct xdr_netobj *cksum)
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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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int len, thislen, offset;
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int i;
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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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if (!(tfm = crypto_alloc_tfm(cksumname, 0)))
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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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buf_to_sg(sg, header, hdrlen);
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crypto_digest_update(tfm, sg, 1);
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if (body->head[0].iov_len) {
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buf_to_sg(sg, body->head[0].iov_base, body->head[0].iov_len);
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crypto_digest_update(tfm, sg, 1);
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}
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len = body->page_len;
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if (len != 0) {
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offset = body->page_base & (PAGE_CACHE_SIZE - 1);
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i = body->page_base >> PAGE_CACHE_SHIFT;
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thislen = PAGE_CACHE_SIZE - offset;
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do {
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if (thislen > len)
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thislen = len;
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sg->page = body->pages[i];
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sg->offset = offset;
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sg->length = thislen;
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kmap(sg->page); /* XXX kmap_atomic? */
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crypto_digest_update(tfm, sg, 1);
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kunmap(sg->page);
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len -= thislen;
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i++;
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offset = 0;
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thislen = PAGE_CACHE_SIZE;
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} while(len != 0);
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}
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if (body->tail[0].iov_len) {
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buf_to_sg(sg, body->tail[0].iov_base, body->tail[0].iov_len);
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crypto_digest_update(tfm, sg, 1);
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}
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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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if (tfm)
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crypto_free_tfm(tfm);
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return code;
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}
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EXPORT_SYMBOL(make_checksum);
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