129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*
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* linux/net/sunrpc/gss_spkm3_seal.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/random.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_make_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_make_token(struct spkm3_ctx *ctx,
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struct xdr_buf * text, struct xdr_netobj * token,
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int toktype)
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{
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s32 checksum_type;
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char tokhdrbuf[25];
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struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
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struct xdr_netobj mic_hdr = {.len = 0, .data = tokhdrbuf};
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int tokenlen = 0;
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unsigned char *ptr;
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s32 now;
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int ctxelen = 0, ctxzbit = 0;
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int md5elen = 0, md5zbit = 0;
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dprintk("RPC: spkm3_make_token\n");
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now = jiffies;
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if (ctx->ctx_id.len != 16) {
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dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n",
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ctx->ctx_id.len);
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goto out_err;
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}
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switch (ctx->intg_alg) {
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case NID_md5:
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checksum_type = CKSUMTYPE_RSA_MD5;
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break;
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default:
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dprintk("RPC: gss_spkm3_seal: ctx->signalg %d not"
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" supported\n", ctx->intg_alg);
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goto out_err;
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}
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/* XXX since we don't support WRAP, perhaps we don't care... */
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if (ctx->conf_alg != NID_cast5_cbc) {
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dprintk("RPC: gss_spkm3_seal: ctx->sealalg %d not supported\n",
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ctx->conf_alg);
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goto out_err;
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}
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if (toktype == SPKM_MIC_TOK) {
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/* Calculate checksum over the mic-header */
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asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit);
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spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data,
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ctxelen, ctxzbit);
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if (make_checksum(checksum_type, mic_hdr.data, mic_hdr.len,
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text, 0, &md5cksum))
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goto out_err;
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asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit);
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tokenlen = 10 + ctxelen + 1 + md5elen + 1;
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/* Create token header using generic routines */
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token->len = g_token_size(&ctx->mech_used, tokenlen);
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ptr = token->data;
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g_make_token_header(&ctx->mech_used, tokenlen, &ptr);
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spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit);
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} else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */
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dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK not supported\n");
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goto out_err;
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}
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kfree(md5cksum.data);
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/* XXX need to implement sequence numbers, and ctx->expired */
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return GSS_S_COMPLETE;
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out_err:
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kfree(md5cksum.data);
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token->data = NULL;
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token->len = 0;
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return GSS_S_FAILURE;
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}
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