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