| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/gss_spkm3_seal.c |
| 3 | * |
| 4 | * Copyright (c) 2003 The Regents of the University of Michigan. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Andy Adamson <andros@umich.edu> |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its |
| 19 | * contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 25 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 30 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 32 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | * |
| 34 | */ |
| 35 | |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/jiffies.h> |
| 39 | #include <linux/sunrpc/gss_spkm3.h> |
| 40 | #include <linux/random.h> |
| 41 | #include <linux/crypto.h> |
| 42 | |
| 43 | #ifdef RPC_DEBUG |
| 44 | # define RPCDBG_FACILITY RPCDBG_AUTH |
| 45 | #endif |
| 46 | |
| 47 | /* |
| 48 | * spkm3_make_token() |
| 49 | * |
| 50 | * Only SPKM_MIC_TOK with md5 intg-alg is supported |
| 51 | */ |
| 52 | |
| 53 | u32 |
| 54 | spkm3_make_token(struct spkm3_ctx *ctx, int qop_req, |
| 55 | struct xdr_buf * text, struct xdr_netobj * token, |
| 56 | int toktype) |
| 57 | { |
| 58 | s32 checksum_type; |
| 59 | char tokhdrbuf[25]; |
| 60 | struct xdr_netobj md5cksum = {.len = 0, .data = NULL}; |
| 61 | struct xdr_netobj mic_hdr = {.len = 0, .data = tokhdrbuf}; |
| 62 | int tmsglen, tokenlen = 0; |
| 63 | unsigned char *ptr; |
| 64 | s32 now; |
| 65 | int ctxelen = 0, ctxzbit = 0; |
| 66 | int md5elen = 0, md5zbit = 0; |
| 67 | |
| 68 | dprintk("RPC: spkm3_make_token\n"); |
| 69 | |
| 70 | now = jiffies; |
| 71 | if (qop_req != 0) |
| 72 | goto out_err; |
| 73 | |
| 74 | if (ctx->ctx_id.len != 16) { |
| 75 | dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n", |
| 76 | ctx->ctx_id.len); |
| 77 | goto out_err; |
| 78 | } |
| 79 | |
| 80 | switch (ctx->intg_alg) { |
| 81 | case NID_md5: |
| 82 | checksum_type = CKSUMTYPE_RSA_MD5; |
| 83 | break; |
| 84 | default: |
| 85 | dprintk("RPC: gss_spkm3_seal: ctx->signalg %d not" |
| 86 | " supported\n", ctx->intg_alg); |
| 87 | goto out_err; |
| 88 | } |
| 89 | /* XXX since we don't support WRAP, perhaps we don't care... */ |
| 90 | if (ctx->conf_alg != NID_cast5_cbc) { |
| 91 | dprintk("RPC: gss_spkm3_seal: ctx->sealalg %d not supported\n", |
| 92 | ctx->conf_alg); |
| 93 | goto out_err; |
| 94 | } |
| 95 | |
| 96 | if (toktype == SPKM_MIC_TOK) { |
| 97 | tmsglen = 0; |
| 98 | /* Calculate checksum over the mic-header */ |
| 99 | asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit); |
| 100 | spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data, |
| 101 | ctxelen, ctxzbit); |
| 102 | |
| 103 | if (make_checksum(checksum_type, mic_hdr.data, mic_hdr.len, |
| 104 | text, &md5cksum)) |
| 105 | goto out_err; |
| 106 | |
| 107 | asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit); |
| 108 | tokenlen = 10 + ctxelen + 1 + 2 + md5elen + 1; |
| 109 | |
| 110 | /* Create token header using generic routines */ |
| 111 | token->len = g_token_size(&ctx->mech_used, tokenlen + tmsglen); |
| 112 | |
| 113 | ptr = token->data; |
| 114 | g_make_token_header(&ctx->mech_used, tokenlen + tmsglen, &ptr); |
| 115 | |
| 116 | spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit); |
| 117 | } else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */ |
| 118 | dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK not supported\n"); |
| 119 | goto out_err; |
| 120 | } |
| 121 | kfree(md5cksum.data); |
| 122 | |
| 123 | /* XXX need to implement sequence numbers, and ctx->expired */ |
| 124 | |
| 125 | return GSS_S_COMPLETE; |
| 126 | out_err: |
| 127 | if (md5cksum.data) |
| 128 | kfree(md5cksum.data); |
| 129 | token->data = NULL; |
| 130 | token->len = 0; |
| 131 | return GSS_S_FAILURE; |
| 132 | } |