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/module.h>
  38 #include <linux/init.h>
  39 #include <linux/types.h>
  40 #include <linux/slab.h>
  41 #include <linux/sunrpc/auth.h>
  42 #include <linux/in.h>
  43 #include <linux/sunrpc/svcauth_gss.h>
  44 #include <linux/sunrpc/gss_spkm3.h>
  45 #include <linux/sunrpc/xdr.h>
  46 #include <linux/crypto.h>
  47
  48 #ifdef RPC_DEBUG
  49 # define RPCDBG_FACILITY        RPCDBG_AUTH
  50 #endif
  51
  52 struct xdr_netobj gss_mech_spkm3_oid =
  53    {7, "\053\006\001\005\005\001\003"};
  54
  55 static inline int
  56 get_bytes(char **ptr, const char *end, void *res, int len)
  57 {
  58         char *p, *q;
  59         p = *ptr;
  60         q = p + len;
  61         if (q > end || q < p)
  62                 return -1;
  63         memcpy(res, p, len);
  64         *ptr = q;
  65         return 0;
  66 }
  67
  68 static inline int
  69 get_netobj(char **ptr, const char *end, struct xdr_netobj *res)
  70 {
  71         char *p, *q;
  72         p = *ptr;
  73         if (get_bytes(&p, end, &res->len, sizeof(res->len)))
  74                 return -1;
  75         q = p + res->len;
  76         if(res->len == 0)
  77                 goto out_nocopy;
  78         if (q > end || q < p)
  79                 return -1;
  80         if (!(res->data = kmalloc(res->len, GFP_KERNEL)))
  81                 return -1;
  82         memcpy(res->data, p, res->len);
  83 out_nocopy:
  84         *ptr = q;
  85         return 0;
  86 }
  87
  88 static inline int
  89 get_key(char **p, char *end, struct crypto_tfm **res, int *resalg)
  90 {
  91         struct xdr_netobj       key = {
  92                 .len = 0,
  93                 .data = NULL,
  94         };
  95         int                     alg_mode,setkey = 0;
  96         char                    *alg_name;
  97
  98         if (get_bytes(p, end, resalg, sizeof(int)))
  99                 goto out_err;
 100         if ((get_netobj(p, end, &key)))
 101                 goto out_err;
 102
 103         switch (*resalg) {
 104                 case NID_des_cbc:
 105                         alg_name = "des";
 106                         alg_mode = CRYPTO_TFM_MODE_CBC;
 107                         setkey = 1;
 108                         break;
 109                 case NID_md5:
 110                         if (key.len == 0) {
 111                                 dprintk("RPC: SPKM3 get_key: NID_md5 zero Key length\n");
 112                         }
 113                         alg_name = "md5";
 114                         alg_mode = 0;
 115                         setkey = 0;
 116                         break;
 117                 case NID_cast5_cbc:
 118                         dprintk("RPC: SPKM3 get_key: case cast5_cbc, UNSUPPORTED \n");
 119                         goto out_err;
 120                         break;
 121                 default:
 122                         dprintk("RPC: SPKM3 get_key: unsupported algorithm %d", *resalg);
 123                         goto out_err_free_key;
 124         }
 125         if (!(*res = crypto_alloc_tfm(alg_name, alg_mode)))
 126                 goto out_err_free_key;
 127         if (setkey) {
 128                 if (crypto_cipher_setkey(*res, key.data, key.len))
 129                         goto out_err_free_tfm;
 130         }
 131
 132         if(key.len > 0)
 133                 kfree(key.data);
 134         return 0;
 135
 136 out_err_free_tfm:
 137         crypto_free_tfm(*res);
 138 out_err_free_key:
 139         if(key.len > 0)
 140                 kfree(key.data);
 141 out_err:
 142         return -1;
 143 }
 144
 145 static u32
 146 gss_import_sec_context_spkm3(struct xdr_netobj *inbuf,
 147                                 struct gss_ctx *ctx_id)
 148 {
 149         char    *p = inbuf->data;
 150         char    *end = inbuf->data + inbuf->len;
 151         struct  spkm3_ctx *ctx;
 152
 153         if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))
 154                 goto out_err;
 155         memset(ctx, 0, sizeof(*ctx));
 156
 157         if (get_netobj(&p, end, &ctx->ctx_id))
 158                 goto out_err_free_ctx;
 159
 160         if (get_bytes(&p, end, &ctx->qop, sizeof(ctx->qop)))
 161                 goto out_err_free_ctx_id;
 162
 163         if (get_netobj(&p, end, &ctx->mech_used))
 164                 goto out_err_free_mech;
 165
 166         if (get_bytes(&p, end, &ctx->ret_flags, sizeof(ctx->ret_flags)))
 167                 goto out_err_free_mech;
 168
 169         if (get_bytes(&p, end, &ctx->req_flags, sizeof(ctx->req_flags)))
 170                 goto out_err_free_mech;
 171
 172         if (get_netobj(&p, end, &ctx->share_key))
 173                 goto out_err_free_s_key;
 174
 175         if (get_key(&p, end, &ctx->derived_conf_key, &ctx->conf_alg)) {
 176                 dprintk("RPC: SPKM3 confidentiality key will be NULL\n");
 177         }
 178
 179         if (get_key(&p, end, &ctx->derived_integ_key, &ctx->intg_alg)) {
 180                 dprintk("RPC: SPKM3 integrity key will be NULL\n");
 181         }
 182
 183         if (get_bytes(&p, end, &ctx->owf_alg, sizeof(ctx->owf_alg)))
 184                 goto out_err_free_s_key;
 185
 186         if (get_bytes(&p, end, &ctx->owf_alg, sizeof(ctx->owf_alg)))
 187                 goto out_err_free_s_key;
 188
 189         if (p != end)
 190                 goto out_err_free_s_key;
 191
 192         ctx_id->internal_ctx_id = ctx;
 193
 194         dprintk("Succesfully imported new spkm context.\n");
 195         return 0;
 196
 197 out_err_free_s_key:
 198         kfree(ctx->share_key.data);
 199 out_err_free_mech:
 200         kfree(ctx->mech_used.data);
 201 out_err_free_ctx_id:
 202         kfree(ctx->ctx_id.data);
 203 out_err_free_ctx:
 204         kfree(ctx);
 205 out_err:
 206         return GSS_S_FAILURE;
 207 }
 208
 209 void
 210 gss_delete_sec_context_spkm3(void *internal_ctx) {
 211         struct spkm3_ctx *sctx = internal_ctx;
 212
 213         if(sctx->derived_integ_key)
 214                 crypto_free_tfm(sctx->derived_integ_key);
 215         if(sctx->derived_conf_key)
 216                 crypto_free_tfm(sctx->derived_conf_key);
 217         if(sctx->share_key.data)
 218                 kfree(sctx->share_key.data);
 219         if(sctx->mech_used.data)
 220                 kfree(sctx->mech_used.data);
 221         kfree(sctx);
 222 }
 223
 224 u32
 225 gss_verify_mic_spkm3(struct gss_ctx             *ctx,
 226                         struct xdr_buf          *signbuf,
 227                         struct xdr_netobj       *checksum,
 228                         u32             *qstate) {
 229         u32 maj_stat = 0;
 230         int qop_state = 0;
 231         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 232
 233         dprintk("RPC: gss_verify_mic_spkm3 calling spkm3_read_token\n");
 234         maj_stat = spkm3_read_token(sctx, checksum, signbuf, &qop_state,
 235                                    SPKM_MIC_TOK);
 236
 237         if (!maj_stat && qop_state)
 238             *qstate = qop_state;
 239
 240         dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
 241         return maj_stat;
 242 }
 243
 244 u32
 245 gss_get_mic_spkm3(struct gss_ctx        *ctx,
 246                      u32                qop,
 247                      struct xdr_buf     *message_buffer,
 248                      struct xdr_netobj  *message_token) {
 249         u32 err = 0;
 250         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 251
 252         dprintk("RPC: gss_get_mic_spkm3\n");
 253
 254         err = spkm3_make_token(sctx, qop, message_buffer,
 255                               message_token, SPKM_MIC_TOK);
 256         return err;
 257 }
 258
 259 static struct gss_api_ops gss_spkm3_ops = {
 260         .gss_import_sec_context = gss_import_sec_context_spkm3,
 261         .gss_get_mic            = gss_get_mic_spkm3,
 262         .gss_verify_mic         = gss_verify_mic_spkm3,
 263         .gss_delete_sec_context = gss_delete_sec_context_spkm3,
 264 };
 265
 266 static struct pf_desc gss_spkm3_pfs[] = {
 267         {RPC_AUTH_GSS_SPKM, 0, RPC_GSS_SVC_NONE, "spkm3"},
 268         {RPC_AUTH_GSS_SPKMI, 0, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
 269 };
 270
 271 static struct gss_api_mech gss_spkm3_mech = {
 272         .gm_name        = "spkm3",
 273         .gm_owner       = THIS_MODULE,
 274         .gm_ops         = &gss_spkm3_ops,
 275         .gm_pf_num      = ARRAY_SIZE(gss_spkm3_pfs),
 276         .gm_pfs         = gss_spkm3_pfs,
 277 };
 278
 279 static int __init init_spkm3_module(void)
 280 {
 281         int status;
 282
 283         status = gss_mech_register(&gss_spkm3_mech);
 284         if (status)
 285                 printk("Failed to register spkm3 gss mechanism!\n");
 286         return 0;
 287 }
 288
 289 static void __exit cleanup_spkm3_module(void)
 290 {
 291         gss_mech_unregister(&gss_spkm3_mech);
 292 }
 293
 294 MODULE_LICENSE("GPL");
 295 module_init(init_spkm3_module);
 296 module_exit(cleanup_spkm3_module);