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187 lines
5.5 KiB
187 lines
5.5 KiB
/*
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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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#include <linux/pagemap.h>
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#include <linux/scatterlist.h>
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#include <linux/sunrpc/xdr.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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const struct xdr_netobj hmac_md5_oid = { 8, "\x2B\x06\x01\x05\x05\x08\x01\x01"};
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const struct xdr_netobj cast5_cbc_oid = {9, "\x2A\x86\x48\x86\xF6\x7D\x07\x42\x0A"};
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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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char cksumdata[16];
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struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
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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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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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if (!g_OID_equal(&ctx->intg_alg, &hmac_md5_oid)) {
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dprintk("RPC: gss_spkm3_seal: unsupported I-ALG "
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"algorithm. only support hmac-md5 I-ALG.\n");
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goto out_err;
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} else
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checksum_type = CKSUMTYPE_HMAC_MD5;
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if (!g_OID_equal(&ctx->conf_alg, &cast5_cbc_oid)) {
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dprintk("RPC: gss_spkm3_seal: unsupported C-ALG "
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"algorithm\n");
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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_spkm3_checksum(checksum_type, &ctx->derived_integ_key,
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(char *)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 "
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"not supported\n");
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goto out_err;
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}
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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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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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static int
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spkm3_checksummer(struct scatterlist *sg, void *data)
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{
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struct hash_desc *desc = data;
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return crypto_hash_update(desc, sg, sg->length);
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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_spkm3_checksum(s32 cksumtype, struct xdr_netobj *key, char *header,
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unsigned int hdrlen, struct xdr_buf *body,
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unsigned int body_offset, struct xdr_netobj *cksum)
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{
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char *cksumname;
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struct hash_desc desc; /* XXX add to ctx? */
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struct scatterlist sg[1];
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int err;
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switch (cksumtype) {
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case CKSUMTYPE_HMAC_MD5:
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cksumname = "hmac(md5)";
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break;
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default:
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dprintk("RPC: spkm3_make_checksum:"
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" unsupported checksum %d", cksumtype);
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return GSS_S_FAILURE;
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}
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if (key->data == NULL || key->len <= 0) return GSS_S_FAILURE;
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desc.tfm = crypto_alloc_hash(cksumname, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(desc.tfm))
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return GSS_S_FAILURE;
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cksum->len = crypto_hash_digestsize(desc.tfm);
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desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
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err = crypto_hash_setkey(desc.tfm, key->data, key->len);
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if (err)
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goto out;
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err = crypto_hash_init(&desc);
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if (err)
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goto out;
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sg_set_buf(sg, header, hdrlen);
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crypto_hash_update(&desc, sg, sg->length);
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xdr_process_buf(body, body_offset, body->len - body_offset,
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spkm3_checksummer, &desc);
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crypto_hash_final(&desc, cksum->data);
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out:
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crypto_free_hash(desc.tfm);
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return err ? GSS_S_FAILURE : 0;
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}
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