net/sunrpc/auth_gss/gss_spkm3_mech.c

   1 /*
   2  *  linux/net/sunrpc/gss_spkm3_mech.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  *  J. Bruce Fields <bfields@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include <linux/err.h>
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/types.h>
  41 #include <linux/slab.h>
  42 #include <linux/sunrpc/auth.h>
  43 #include <linux/in.h>
  44 #include <linux/sunrpc/svcauth_gss.h>
  45 #include <linux/sunrpc/gss_spkm3.h>
  46 #include <linux/sunrpc/xdr.h>
  47 #include <linux/crypto.h>
  48
  49 #ifdef RPC_DEBUG
  50 # define RPCDBG_FACILITY        RPCDBG_AUTH
  51 #endif
  52
  53 static const void *
  54 simple_get_bytes(const void *p, const void *end, void *res, int len)
  55 {
  56         const void *q = (const void *)((const char *)p + len);
  57         if (unlikely(q > end || q < p))
  58                 return ERR_PTR(-EFAULT);
  59         memcpy(res, p, len);
  60         return q;
  61 }
  62
  63 static const void *
  64 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
  65 {
  66         const void *q;
  67         unsigned int len;
  68         p = simple_get_bytes(p, end, &len, sizeof(len));
  69         if (IS_ERR(p))
  70                 return p;
  71         res->len = len;
  72         if (len == 0) {
  73                 res->data = NULL;
  74                 return p;
  75         }
  76         q = (const void *)((const char *)p + len);
  77         if (unlikely(q > end || q < p))
  78                 return ERR_PTR(-EFAULT);
  79         res->data = kmemdup(p, len, GFP_NOFS);
  80         if (unlikely(res->data == NULL))
  81                 return ERR_PTR(-ENOMEM);
  82         return q;
  83 }
  84
  85 static int
  86 gss_import_sec_context_spkm3(const void *p, size_t len,
  87                                 struct gss_ctx *ctx_id)
  88 {
  89         const void *end = (const void *)((const char *)p + len);
  90         struct  spkm3_ctx *ctx;
  91         int     version;
  92
  93         if (!(ctx = kzalloc(sizeof(*ctx), GFP_NOFS)))
  94                 goto out_err;
  95
  96         p = simple_get_bytes(p, end, &version, sizeof(version));
  97         if (IS_ERR(p))
  98                 goto out_err_free_ctx;
  99         if (version != 1) {
 100                 dprintk("RPC:       unknown spkm3 token format: "
 101                                 "obsolete nfs-utils?\n");
 102                 goto out_err_free_ctx;
 103         }
 104
 105         p = simple_get_netobj(p, end, &ctx->ctx_id);
 106         if (IS_ERR(p))
 107                 goto out_err_free_ctx;
 108
 109         p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
 110         if (IS_ERR(p))
 111                 goto out_err_free_ctx_id;
 112
 113         p = simple_get_netobj(p, end, &ctx->mech_used);
 114         if (IS_ERR(p))
 115                 goto out_err_free_ctx_id;
 116
 117         p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
 118         if (IS_ERR(p))
 119                 goto out_err_free_mech;
 120
 121         p = simple_get_netobj(p, end, &ctx->conf_alg);
 122         if (IS_ERR(p))
 123                 goto out_err_free_mech;
 124
 125         p = simple_get_netobj(p, end, &ctx->derived_conf_key);
 126         if (IS_ERR(p))
 127                 goto out_err_free_conf_alg;
 128
 129         p = simple_get_netobj(p, end, &ctx->intg_alg);
 130         if (IS_ERR(p))
 131                 goto out_err_free_conf_key;
 132
 133         p = simple_get_netobj(p, end, &ctx->derived_integ_key);
 134         if (IS_ERR(p))
 135                 goto out_err_free_intg_alg;
 136
 137         if (p != end)
 138                 goto out_err_free_intg_key;
 139
 140         ctx_id->internal_ctx_id = ctx;
 141
 142         dprintk("RPC:       Successfully imported new spkm context.\n");
 143         return 0;
 144
 145 out_err_free_intg_key:
 146         kfree(ctx->derived_integ_key.data);
 147 out_err_free_intg_alg:
 148         kfree(ctx->intg_alg.data);
 149 out_err_free_conf_key:
 150         kfree(ctx->derived_conf_key.data);
 151 out_err_free_conf_alg:
 152         kfree(ctx->conf_alg.data);
 153 out_err_free_mech:
 154         kfree(ctx->mech_used.data);
 155 out_err_free_ctx_id:
 156         kfree(ctx->ctx_id.data);
 157 out_err_free_ctx:
 158         kfree(ctx);
 159 out_err:
 160         return PTR_ERR(p);
 161 }
 162
 163 static void
 164 gss_delete_sec_context_spkm3(void *internal_ctx)
 165 {
 166         struct spkm3_ctx *sctx = internal_ctx;
 167
 168         kfree(sctx->derived_integ_key.data);
 169         kfree(sctx->intg_alg.data);
 170         kfree(sctx->derived_conf_key.data);
 171         kfree(sctx->conf_alg.data);
 172         kfree(sctx->mech_used.data);
 173         kfree(sctx->ctx_id.data);
 174         kfree(sctx);
 175 }
 176
 177 static u32
 178 gss_verify_mic_spkm3(struct gss_ctx             *ctx,
 179                         struct xdr_buf          *signbuf,
 180                         struct xdr_netobj       *checksum)
 181 {
 182         u32 maj_stat = 0;
 183         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 184
 185         maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
 186
 187         dprintk("RPC:       gss_verify_mic_spkm3 returning %d\n", maj_stat);
 188         return maj_stat;
 189 }
 190
 191 static u32
 192 gss_get_mic_spkm3(struct gss_ctx        *ctx,
 193                      struct xdr_buf     *message_buffer,
 194                      struct xdr_netobj  *message_token)
 195 {
 196         u32 err = 0;
 197         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 198
 199         err = spkm3_make_token(sctx, message_buffer,
 200                                 message_token, SPKM_MIC_TOK);
 201         dprintk("RPC:       gss_get_mic_spkm3 returning %d\n", err);
 202         return err;
 203 }
 204
 205 static const struct gss_api_ops gss_spkm3_ops = {
 206         .gss_import_sec_context = gss_import_sec_context_spkm3,
 207         .gss_get_mic            = gss_get_mic_spkm3,
 208         .gss_verify_mic         = gss_verify_mic_spkm3,
 209         .gss_delete_sec_context = gss_delete_sec_context_spkm3,
 210 };
 211
 212 static struct pf_desc gss_spkm3_pfs[] = {
 213         {RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
 214         {RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
 215 };
 216
 217 static struct gss_api_mech gss_spkm3_mech = {
 218         .gm_name        = "spkm3",
 219         .gm_owner       = THIS_MODULE,
 220         .gm_oid         = {7, "\053\006\001\005\005\001\003"},
 221         .gm_ops         = &gss_spkm3_ops,
 222         .gm_pf_num      = ARRAY_SIZE(gss_spkm3_pfs),
 223         .gm_pfs         = gss_spkm3_pfs,
 224 };
 225
 226 static int __init init_spkm3_module(void)
 227 {
 228         int status;
 229
 230         status = gss_mech_register(&gss_spkm3_mech);
 231         if (status)
 232                 printk("Failed to register spkm3 gss mechanism!\n");
 233         return status;
 234 }
 235
 236 static void __exit cleanup_spkm3_module(void)
 237 {
 238         gss_mech_unregister(&gss_spkm3_mech);
 239 }
 240
 241 MODULE_LICENSE("GPL");
 242 module_init(init_spkm3_module);
 243 module_exit(cleanup_spkm3_module);