![J. Bruce Fields - unquoted](/assets/img/avatar_default.png)
There's an initialization step here I missed. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
188 lines
5.5 KiB
C
188 lines
5.5 KiB
C
/*
|
|
* linux/net/sunrpc/gss_spkm3_seal.c
|
|
*
|
|
* Copyright (c) 2003 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Andy Adamson <andros@umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/sunrpc/gss_spkm3.h>
|
|
#include <linux/random.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/sunrpc/xdr.h>
|
|
|
|
#ifdef RPC_DEBUG
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
const struct xdr_netobj hmac_md5_oid = { 8, "\x2B\x06\x01\x05\x05\x08\x01\x01"};
|
|
const struct xdr_netobj cast5_cbc_oid = {9, "\x2A\x86\x48\x86\xF6\x7D\x07\x42\x0A"};
|
|
|
|
/*
|
|
* spkm3_make_token()
|
|
*
|
|
* Only SPKM_MIC_TOK with md5 intg-alg is supported
|
|
*/
|
|
|
|
u32
|
|
spkm3_make_token(struct spkm3_ctx *ctx,
|
|
struct xdr_buf * text, struct xdr_netobj * token,
|
|
int toktype)
|
|
{
|
|
s32 checksum_type;
|
|
char tokhdrbuf[25];
|
|
char cksumdata[16];
|
|
struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
|
|
struct xdr_netobj mic_hdr = {.len = 0, .data = tokhdrbuf};
|
|
int tokenlen = 0;
|
|
unsigned char *ptr;
|
|
s32 now;
|
|
int ctxelen = 0, ctxzbit = 0;
|
|
int md5elen = 0, md5zbit = 0;
|
|
|
|
now = jiffies;
|
|
|
|
if (ctx->ctx_id.len != 16) {
|
|
dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n",
|
|
ctx->ctx_id.len);
|
|
goto out_err;
|
|
}
|
|
|
|
if (!g_OID_equal(&ctx->intg_alg, &hmac_md5_oid)) {
|
|
dprintk("RPC: gss_spkm3_seal: unsupported I-ALG "
|
|
"algorithm. only support hmac-md5 I-ALG.\n");
|
|
goto out_err;
|
|
} else
|
|
checksum_type = CKSUMTYPE_HMAC_MD5;
|
|
|
|
if (!g_OID_equal(&ctx->conf_alg, &cast5_cbc_oid)) {
|
|
dprintk("RPC: gss_spkm3_seal: unsupported C-ALG "
|
|
"algorithm\n");
|
|
goto out_err;
|
|
}
|
|
|
|
if (toktype == SPKM_MIC_TOK) {
|
|
/* Calculate checksum over the mic-header */
|
|
asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit);
|
|
spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data,
|
|
ctxelen, ctxzbit);
|
|
if (make_spkm3_checksum(checksum_type, &ctx->derived_integ_key,
|
|
(char *)mic_hdr.data, mic_hdr.len,
|
|
text, 0, &md5cksum))
|
|
goto out_err;
|
|
|
|
asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit);
|
|
tokenlen = 10 + ctxelen + 1 + md5elen + 1;
|
|
|
|
/* Create token header using generic routines */
|
|
token->len = g_token_size(&ctx->mech_used, tokenlen);
|
|
|
|
ptr = token->data;
|
|
g_make_token_header(&ctx->mech_used, tokenlen, &ptr);
|
|
|
|
spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit);
|
|
} else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */
|
|
dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK "
|
|
"not supported\n");
|
|
goto out_err;
|
|
}
|
|
|
|
/* XXX need to implement sequence numbers, and ctx->expired */
|
|
|
|
return GSS_S_COMPLETE;
|
|
out_err:
|
|
token->data = NULL;
|
|
token->len = 0;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
static int
|
|
spkm3_checksummer(struct scatterlist *sg, void *data)
|
|
{
|
|
struct hash_desc *desc = data;
|
|
|
|
return crypto_hash_update(desc, sg, sg->length);
|
|
}
|
|
|
|
/* checksum the plaintext data and hdrlen bytes of the token header */
|
|
s32
|
|
make_spkm3_checksum(s32 cksumtype, struct xdr_netobj *key, char *header,
|
|
unsigned int hdrlen, struct xdr_buf *body,
|
|
unsigned int body_offset, struct xdr_netobj *cksum)
|
|
{
|
|
char *cksumname;
|
|
struct hash_desc desc; /* XXX add to ctx? */
|
|
struct scatterlist sg[1];
|
|
int err;
|
|
|
|
switch (cksumtype) {
|
|
case CKSUMTYPE_HMAC_MD5:
|
|
cksumname = "hmac(md5)";
|
|
break;
|
|
default:
|
|
dprintk("RPC: spkm3_make_checksum:"
|
|
" unsupported checksum %d", cksumtype);
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
if (key->data == NULL || key->len <= 0) return GSS_S_FAILURE;
|
|
|
|
desc.tfm = crypto_alloc_hash(cksumname, 0, CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(desc.tfm))
|
|
return GSS_S_FAILURE;
|
|
cksum->len = crypto_hash_digestsize(desc.tfm);
|
|
desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
|
|
|
|
err = crypto_hash_setkey(desc.tfm, key->data, key->len);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = crypto_hash_init(&desc);
|
|
if (err)
|
|
goto out;
|
|
|
|
sg_set_buf(sg, header, hdrlen);
|
|
crypto_hash_update(&desc, sg, sg->length);
|
|
|
|
xdr_process_buf(body, body_offset, body->len - body_offset,
|
|
spkm3_checksummer, &desc);
|
|
crypto_hash_final(&desc, cksum->data);
|
|
|
|
out:
|
|
crypto_free_hash(desc.tfm);
|
|
|
|
return err ? GSS_S_FAILURE : 0;
|
|
}
|