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 static const void *
  53 simple_get_bytes(const void *p, const void *end, void *res, int len)
  54 {
  55         const void *q = (const void *)((const char *)p + len);
  56         if (unlikely(q > end || q < p))
  57                 return ERR_PTR(-EFAULT);
  58         memcpy(res, p, len);
  59         return q;
  60 }
  61
  62 static const void *
  63 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
  64 {
  65         const void *q;
  66         unsigned int len;
  67         p = simple_get_bytes(p, end, &len, sizeof(len));
  68         if (IS_ERR(p))
  69                 return p;
  70         res->len = len;
  71         if (len == 0) {
  72                 res->data = NULL;
  73                 return p;
  74         }
  75         q = (const void *)((const char *)p + len);
  76         if (unlikely(q > end || q < p))
  77                 return ERR_PTR(-EFAULT);
  78         res->data = kmalloc(len, GFP_KERNEL);
  79         if (unlikely(res->data == NULL))
  80                 return ERR_PTR(-ENOMEM);
  81         memcpy(res->data, p, len);
  82         return q;
  83 }
  84
  85 static inline const void *
  86 get_key(const void *p, const void *end, struct crypto_tfm **res, int *resalg)
  87 {
  88         struct xdr_netobj       key = { 0 };
  89         int                     alg_mode,setkey = 0;
  90         char                    *alg_name;
  91
  92         p = simple_get_bytes(p, end, resalg, sizeof(*resalg));
  93         if (IS_ERR(p))
  94                 goto out_err;
  95         p = simple_get_netobj(p, end, &key);
  96         if (IS_ERR(p))
  97                 goto out_err;
  98
  99         switch (*resalg) {
 100                 case NID_des_cbc:
 101                         alg_name = "des";
 102                         alg_mode = CRYPTO_TFM_MODE_CBC;
 103                         setkey = 1;
 104                         break;
 105                 case NID_cast5_cbc:
 106                         /* XXXX here in name only, not used */
 107                         alg_name = "cast5";
 108                         alg_mode = CRYPTO_TFM_MODE_CBC;
 109                         setkey = 0; /* XXX will need to set to 1 */
 110                         break;
 111                 case NID_md5:
 112                         if (key.len == 0) {
 113                                 dprintk("RPC: SPKM3 get_key: NID_md5 zero Key length\n");
 114                         }
 115                         alg_name = "md5";
 116                         alg_mode = 0;
 117                         setkey = 0;
 118                         break;
 119                 default:
 120                         dprintk("gss_spkm3_mech: unsupported algorithm %d\n", *resalg);
 121                         goto out_err_free_key;
 122         }
 123         if (!(*res = crypto_alloc_tfm(alg_name, alg_mode))) {
 124                 printk("gss_spkm3_mech: unable to initialize crypto algorthm %s\n", alg_name);
 125                 goto out_err_free_key;
 126         }
 127         if (setkey) {
 128                 if (crypto_cipher_setkey(*res, key.data, key.len)) {
 129                         printk("gss_spkm3_mech: error setting key for crypto algorthm %s\n", alg_name);
 130                         goto out_err_free_tfm;
 131                 }
 132         }
 133
 134         if(key.len > 0)
 135                 kfree(key.data);
 136         return p;
 137
 138 out_err_free_tfm:
 139         crypto_free_tfm(*res);
 140 out_err_free_key:
 141         if(key.len > 0)
 142                 kfree(key.data);
 143         p = ERR_PTR(-EINVAL);
 144 out_err:
 145         return p;
 146 }
 147
 148 static int
 149 gss_import_sec_context_spkm3(const void *p, size_t len,
 150                                 struct gss_ctx *ctx_id)
 151 {
 152         const void *end = (const void *)((const char *)p + len);
 153         struct  spkm3_ctx *ctx;
 154
 155         if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))
 156                 goto out_err;
 157         memset(ctx, 0, sizeof(*ctx));
 158
 159         p = simple_get_netobj(p, end, &ctx->ctx_id);
 160         if (IS_ERR(p))
 161                 goto out_err_free_ctx;
 162
 163         p = simple_get_bytes(p, end, &ctx->qop, sizeof(ctx->qop));
 164         if (IS_ERR(p))
 165                 goto out_err_free_ctx_id;
 166
 167         p = simple_get_netobj(p, end, &ctx->mech_used);
 168         if (IS_ERR(p))
 169                 goto out_err_free_mech;
 170
 171         p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
 172         if (IS_ERR(p))
 173                 goto out_err_free_mech;
 174
 175         p = simple_get_bytes(p, end, &ctx->req_flags, sizeof(ctx->req_flags));
 176         if (IS_ERR(p))
 177                 goto out_err_free_mech;
 178
 179         p = simple_get_netobj(p, end, &ctx->share_key);
 180         if (IS_ERR(p))
 181                 goto out_err_free_s_key;
 182
 183         p = get_key(p, end, &ctx->derived_conf_key, &ctx->conf_alg);
 184         if (IS_ERR(p))
 185                 goto out_err_free_s_key;
 186
 187         p = get_key(p, end, &ctx->derived_integ_key, &ctx->intg_alg);
 188         if (IS_ERR(p))
 189                 goto out_err_free_key1;
 190
 191         p = simple_get_bytes(p, end, &ctx->keyestb_alg, sizeof(ctx->keyestb_alg));
 192         if (IS_ERR(p))
 193                 goto out_err_free_key2;
 194
 195         p = simple_get_bytes(p, end, &ctx->owf_alg, sizeof(ctx->owf_alg));
 196         if (IS_ERR(p))
 197                 goto out_err_free_key2;
 198
 199         if (p != end)
 200                 goto out_err_free_key2;
 201
 202         ctx_id->internal_ctx_id = ctx;
 203
 204         dprintk("Succesfully imported new spkm context.\n");
 205         return 0;
 206
 207 out_err_free_key2:
 208         crypto_free_tfm(ctx->derived_integ_key);
 209 out_err_free_key1:
 210         crypto_free_tfm(ctx->derived_conf_key);
 211 out_err_free_s_key:
 212         kfree(ctx->share_key.data);
 213 out_err_free_mech:
 214         kfree(ctx->mech_used.data);
 215 out_err_free_ctx_id:
 216         kfree(ctx->ctx_id.data);
 217 out_err_free_ctx:
 218         kfree(ctx);
 219 out_err:
 220         return PTR_ERR(p);
 221 }
 222
 223 static void
 224 gss_delete_sec_context_spkm3(void *internal_ctx) {
 225         struct spkm3_ctx *sctx = internal_ctx;
 226
 227         crypto_free_tfm(sctx->derived_integ_key);
 228         crypto_free_tfm(sctx->derived_conf_key);
 229         kfree(sctx->share_key.data);
 230         kfree(sctx->mech_used.data);
 231         kfree(sctx);
 232 }
 233
 234 static u32
 235 gss_verify_mic_spkm3(struct gss_ctx             *ctx,
 236                         struct xdr_buf          *signbuf,
 237                         struct xdr_netobj       *checksum)
 238 {
 239         u32 maj_stat = 0;
 240         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 241
 242         dprintk("RPC: gss_verify_mic_spkm3 calling spkm3_read_token\n");
 243         maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
 244
 245         dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
 246         return maj_stat;
 247 }
 248
 249 static u32
 250 gss_get_mic_spkm3(struct gss_ctx        *ctx,
 251                      struct xdr_buf     *message_buffer,
 252                      struct xdr_netobj  *message_token)
 253 {
 254         u32 err = 0;
 255         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 256
 257         dprintk("RPC: gss_get_mic_spkm3\n");
 258
 259         err = spkm3_make_token(sctx, message_buffer,
 260                               message_token, SPKM_MIC_TOK);
 261         return err;
 262 }
 263
 264 static struct gss_api_ops gss_spkm3_ops = {
 265         .gss_import_sec_context = gss_import_sec_context_spkm3,
 266         .gss_get_mic            = gss_get_mic_spkm3,
 267         .gss_verify_mic         = gss_verify_mic_spkm3,
 268         .gss_delete_sec_context = gss_delete_sec_context_spkm3,
 269 };
 270
 271 static struct pf_desc gss_spkm3_pfs[] = {
 272         {RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
 273         {RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
 274 };
 275
 276 static struct gss_api_mech gss_spkm3_mech = {
 277         .gm_name        = "spkm3",
 278         .gm_owner       = THIS_MODULE,
 279         .gm_ops         = &gss_spkm3_ops,
 280         .gm_pf_num      = ARRAY_SIZE(gss_spkm3_pfs),
 281         .gm_pfs         = gss_spkm3_pfs,
 282 };
 283
 284 static int __init init_spkm3_module(void)
 285 {
 286         int status;
 287
 288         status = gss_mech_register(&gss_spkm3_mech);
 289         if (status)
 290                 printk("Failed to register spkm3 gss mechanism!\n");
 291         return 0;
 292 }
 293
 294 static void __exit cleanup_spkm3_module(void)
 295 {
 296         gss_mech_unregister(&gss_spkm3_mech);
 297 }
 298
 299 MODULE_LICENSE("GPL");
 300 module_init(init_spkm3_module);
 301 module_exit(cleanup_spkm3_module);