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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [sunrpc/] [auth_gss/] [gss_spkm3_unseal.c] - Rev 8
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/* * linux/net/sunrpc/gss_spkm3_unseal.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/crypto.h> #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_AUTH #endif /* * spkm3_read_token() * * only SPKM_MIC_TOK with md5 intg-alg is supported */ u32 spkm3_read_token(struct spkm3_ctx *ctx, struct xdr_netobj *read_token, /* checksum */ struct xdr_buf *message_buffer, /* signbuf */ int toktype) { s32 checksum_type; s32 code; struct xdr_netobj wire_cksum = {.len =0, .data = NULL}; char cksumdata[16]; struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata}; unsigned char *ptr = (unsigned char *)read_token->data; unsigned char *cksum; int bodysize, md5elen; int mic_hdrlen; u32 ret = GSS_S_DEFECTIVE_TOKEN; if (g_verify_token_header((struct xdr_netobj *) &ctx->mech_used, &bodysize, &ptr, read_token->len)) goto out; /* decode the token */ if (toktype != SPKM_MIC_TOK) { dprintk("RPC: BAD SPKM3 token type: %d\n", toktype); goto out; } if ((ret = spkm3_verify_mic_token(&ptr, &mic_hdrlen, &cksum))) goto out; if (*cksum++ != 0x03) { dprintk("RPC: spkm3_read_token BAD checksum type\n"); goto out; } md5elen = *cksum++; cksum++; /* move past the zbit */ if (!decode_asn1_bitstring(&wire_cksum, cksum, md5elen - 1, 16)) goto out; /* HARD CODED FOR MD5 */ /* compute the checksum of the message. * ptr + 2 = start of header piece of checksum * mic_hdrlen + 2 = length of header piece of checksum */ ret = GSS_S_DEFECTIVE_TOKEN; if (!g_OID_equal(&ctx->intg_alg, &hmac_md5_oid)) { dprintk("RPC: gss_spkm3_seal: unsupported I-ALG " "algorithm\n"); goto out; } checksum_type = CKSUMTYPE_HMAC_MD5; code = make_spkm3_checksum(checksum_type, &ctx->derived_integ_key, ptr + 2, mic_hdrlen + 2, message_buffer, 0, &md5cksum); if (code) goto out; ret = GSS_S_BAD_SIG; code = memcmp(md5cksum.data, wire_cksum.data, wire_cksum.len); if (code) { dprintk("RPC: bad MIC checksum\n"); goto out; } /* XXX: need to add expiration and sequencing */ ret = GSS_S_COMPLETE; out: kfree(wire_cksum.data); return ret; }