+++ /dev/null
-/*
- * linux/net/sunrpc/gss_spkm3_token.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>
-
-#ifdef RPC_DEBUG
-# define RPCDBG_FACILITY RPCDBG_AUTH
-#endif
-
-/*
- * asn1_bitstring_len()
- *
- * calculate the asn1 bitstring length of the xdr_netobject
- */
-void
-asn1_bitstring_len(struct xdr_netobj *in, int *enclen, int *zerobits)
-{
- int i, zbit = 0,elen = in->len;
- char *ptr;
-
- ptr = &in->data[in->len -1];
-
- /* count trailing 0's */
- for(i = in->len; i > 0; i--) {
- if (*ptr == 0) {
- ptr--;
- elen--;
- } else
- break;
- }
-
- /* count number of 0 bits in final octet */
- ptr = &in->data[elen - 1];
- for(i = 0; i < 8; i++) {
- short mask = 0x01;
-
- if (!((mask << i) & *ptr))
- zbit++;
- else
- break;
- }
- *enclen = elen;
- *zerobits = zbit;
-}
-
-/*
- * decode_asn1_bitstring()
- *
- * decode a bitstring into a buffer of the expected length.
- * enclen = bit string length
- * explen = expected length (define in rfc)
- */
-int
-decode_asn1_bitstring(struct xdr_netobj *out, char *in, int enclen, int explen)
-{
- if (!(out->data = kzalloc(explen,GFP_NOFS)))
- return 0;
- out->len = explen;
- memcpy(out->data, in, enclen);
- return 1;
-}
-
-/*
- * SPKMInnerContextToken choice SPKM_MIC asn1 token layout
- *
- * contextid is always 16 bytes plain data. max asn1 bitstring len = 17.
- *
- * tokenlen = pos[0] to end of token (max pos[45] with MD5 cksum)
- *
- * pos value
- * ----------
- * [0] a4 SPKM-MIC tag
- * [1] ?? innertoken length (max 44)
- *
- *
- * tok_hdr piece of checksum data starts here
- *
- * the maximum mic-header len = 9 + 17 = 26
- * mic-header
- * ----------
- * [2] 30 SEQUENCE tag
- * [3] ?? mic-header length: (max 23) = TokenID + ContextID
- *
- * TokenID - all fields constant and can be hardcoded
- * -------
- * [4] 02 Type 2
- * [5] 02 Length 2
- * [6][7] 01 01 TokenID (SPKM_MIC_TOK)
- *
- * ContextID - encoded length not constant, calculated
- * ---------
- * [8] 03 Type 3
- * [9] ?? encoded length
- * [10] ?? ctxzbit
- * [11] contextid
- *
- * mic_header piece of checksum data ends here.
- *
- * int-cksum - encoded length not constant, calculated
- * ---------
- * [??] 03 Type 3
- * [??] ?? encoded length
- * [??] ?? md5zbit
- * [??] int-cksum (NID_md5 = 16)
- *
- * maximum SPKM-MIC innercontext token length =
- * 10 + encoded contextid_size(17 max) + 2 + encoded
- * cksum_size (17 maxfor NID_md5) = 46
- */
-
-/*
- * spkm3_mic_header()
- *
- * Prepare the SPKM_MIC_TOK mic-header for check-sum calculation
- * elen: 16 byte context id asn1 bitstring encoded length
- */
-void
-spkm3_mic_header(unsigned char **hdrbuf, unsigned int *hdrlen, unsigned char *ctxdata, int elen, int zbit)
-{
- char *hptr = *hdrbuf;
- char *top = *hdrbuf;
-
- *(u8 *)hptr++ = 0x30;
- *(u8 *)hptr++ = elen + 7; /* on the wire header length */
-
- /* tokenid */
- *(u8 *)hptr++ = 0x02;
- *(u8 *)hptr++ = 0x02;
- *(u8 *)hptr++ = 0x01;
- *(u8 *)hptr++ = 0x01;
-
- /* coniextid */
- *(u8 *)hptr++ = 0x03;
- *(u8 *)hptr++ = elen + 1; /* add 1 to include zbit */
- *(u8 *)hptr++ = zbit;
- memcpy(hptr, ctxdata, elen);
- hptr += elen;
- *hdrlen = hptr - top;
-}
-
-/*
- * spkm3_mic_innercontext_token()
- *
- * *tokp points to the beginning of the SPKM_MIC token described
- * in rfc 2025, section 3.2.1:
- *
- * toklen is the inner token length
- */
-void
-spkm3_make_mic_token(unsigned char **tokp, int toklen, struct xdr_netobj *mic_hdr, struct xdr_netobj *md5cksum, int md5elen, int md5zbit)
-{
- unsigned char *ict = *tokp;
-
- *(u8 *)ict++ = 0xa4;
- *(u8 *)ict++ = toklen;
- memcpy(ict, mic_hdr->data, mic_hdr->len);
- ict += mic_hdr->len;
-
- *(u8 *)ict++ = 0x03;
- *(u8 *)ict++ = md5elen + 1; /* add 1 to include zbit */
- *(u8 *)ict++ = md5zbit;
- memcpy(ict, md5cksum->data, md5elen);
-}
-
-u32
-spkm3_verify_mic_token(unsigned char **tokp, int *mic_hdrlen, unsigned char **cksum)
-{
- struct xdr_netobj spkm3_ctx_id = {.len =0, .data = NULL};
- unsigned char *ptr = *tokp;
- int ctxelen;
- u32 ret = GSS_S_DEFECTIVE_TOKEN;
-
- /* spkm3 innercontext token preamble */
- if ((ptr[0] != 0xa4) || (ptr[2] != 0x30)) {
- dprintk("RPC: BAD SPKM ictoken preamble\n");
- goto out;
- }
-
- *mic_hdrlen = ptr[3];
-
- /* token type */
- if ((ptr[4] != 0x02) || (ptr[5] != 0x02)) {
- dprintk("RPC: BAD asn1 SPKM3 token type\n");
- goto out;
- }
-
- /* only support SPKM_MIC_TOK */
- if((ptr[6] != 0x01) || (ptr[7] != 0x01)) {
- dprintk("RPC: ERROR unsupported SPKM3 token\n");
- goto out;
- }
-
- /* contextid */
- if (ptr[8] != 0x03) {
- dprintk("RPC: BAD SPKM3 asn1 context-id type\n");
- goto out;
- }
-
- ctxelen = ptr[9];
- if (ctxelen > 17) { /* length includes asn1 zbit octet */
- dprintk("RPC: BAD SPKM3 contextid len %d\n", ctxelen);
- goto out;
- }
-
- /* ignore ptr[10] */
-
- if(!decode_asn1_bitstring(&spkm3_ctx_id, &ptr[11], ctxelen - 1, 16))
- goto out;
-
- /*
- * in the current implementation: the optional int-alg is not present
- * so the default int-alg (md5) is used the optional snd-seq field is
- * also not present
- */
-
- if (*mic_hdrlen != 6 + ctxelen) {
- dprintk("RPC: BAD SPKM_ MIC_TOK header len %d: we only "
- "support default int-alg (should be absent) "
- "and do not support snd-seq\n", *mic_hdrlen);
- goto out;
- }
- /* checksum */
- *cksum = (&ptr[10] + ctxelen); /* ctxelen includes ptr[10] */
-
- ret = GSS_S_COMPLETE;
-out:
- kfree(spkm3_ctx_id.data);
- return ret;
-}
-
projects / mv-sheeva.git / blobdiff