adeb8133dd
This updates the spkm3 code to bring it up to date with our current understanding of the spkm3 spec. In doing so, we're changing the downcall format used by gssd in the spkm3 case, which will cause an incompatilibity with old userland spkm3 support. Since the old code a) didn't implement the protocol correctly, and b) was never distributed except in the form of some experimental patches from the citi web site, we're assuming this is OK. We do detect the old downcall format and print warning (and fail). We also include a version number in the new downcall format, to be used in the future in case any further change is required. In some more detail: - fix integrity support - removed dependency on NIDs. instead OIDs are used - known OID values for algorithms added. - fixed some context fields and types Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
126 lines
3.7 KiB
C
126 lines
3.7 KiB
C
/*
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* linux/net/sunrpc/gss_spkm3_unseal.c
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*
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* Copyright (c) 2003 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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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/sunrpc/gss_spkm3.h>
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#include <linux/crypto.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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/*
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* spkm3_read_token()
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*
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* only SPKM_MIC_TOK with md5 intg-alg is supported
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*/
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u32
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spkm3_read_token(struct spkm3_ctx *ctx,
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struct xdr_netobj *read_token, /* checksum */
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struct xdr_buf *message_buffer, /* signbuf */
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int toktype)
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{
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s32 checksum_type;
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s32 code;
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struct xdr_netobj wire_cksum = {.len =0, .data = NULL};
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char cksumdata[16];
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struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
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unsigned char *ptr = (unsigned char *)read_token->data;
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unsigned char *cksum;
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int bodysize, md5elen;
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int mic_hdrlen;
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u32 ret = GSS_S_DEFECTIVE_TOKEN;
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if (g_verify_token_header((struct xdr_netobj *) &ctx->mech_used,
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&bodysize, &ptr, read_token->len))
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goto out;
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/* decode the token */
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if (toktype != SPKM_MIC_TOK) {
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dprintk("RPC: BAD SPKM3 token type: %d\n", toktype);
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goto out;
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}
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if ((ret = spkm3_verify_mic_token(&ptr, &mic_hdrlen, &cksum)))
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goto out;
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if (*cksum++ != 0x03) {
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dprintk("RPC: spkm3_read_token BAD checksum type\n");
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goto out;
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}
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md5elen = *cksum++;
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cksum++; /* move past the zbit */
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if (!decode_asn1_bitstring(&wire_cksum, cksum, md5elen - 1, 16))
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goto out;
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/* HARD CODED FOR MD5 */
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/* compute the checksum of the message.
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* ptr + 2 = start of header piece of checksum
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* mic_hdrlen + 2 = length of header piece of checksum
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*/
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ret = GSS_S_DEFECTIVE_TOKEN;
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if (!g_OID_equal(&ctx->intg_alg, &hmac_md5_oid)) {
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dprintk("RPC: gss_spkm3_seal: unsupported I-ALG algorithm\n");
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goto out;
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}
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checksum_type = CKSUMTYPE_HMAC_MD5;
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code = make_spkm3_checksum(checksum_type,
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&ctx->derived_integ_key, ptr + 2, mic_hdrlen + 2,
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message_buffer, 0, &md5cksum);
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if (code)
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goto out;
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ret = GSS_S_BAD_SIG;
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code = memcmp(md5cksum.data, wire_cksum.data, wire_cksum.len);
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if (code) {
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dprintk("RPC: bad MIC checksum\n");
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goto out;
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}
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/* XXX: need to add expiration and sequencing */
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ret = GSS_S_COMPLETE;
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out:
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kfree(wire_cksum.data);
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return ret;
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}
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