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_md5:
 106                         if (key.len == 0) {
 107                                 dprintk("RPC: SPKM3 get_key: NID_md5 zero Key length\n");
 108                         }
 109                         alg_name = "md5";
 110                         alg_mode = 0;
 111                         setkey = 0;
 112                         break;
 113                 default:
 114                         dprintk("RPC: SPKM3 get_key: unsupported algorithm %d", *resalg);
 115                         goto out_err_free_key;
 116         }
 117         if (!(*res = crypto_alloc_tfm(alg_name, alg_mode)))
 118                 goto out_err_free_key;
 119         if (setkey) {
 120                 if (crypto_cipher_setkey(*res, key.data, key.len))
 121                         goto out_err_free_tfm;
 122         }
 123
 124         if(key.len > 0)
 125                 kfree(key.data);
 126         return p;
 127
 128 out_err_free_tfm:
 129         crypto_free_tfm(*res);
 130 out_err_free_key:
 131         if(key.len > 0)
 132                 kfree(key.data);
 133         p = ERR_PTR(-EINVAL);
 134 out_err:
 135         return p;
 136 }
 137
 138 static int
 139 gss_import_sec_context_spkm3(const void *p, size_t len,
 140                                 struct gss_ctx *ctx_id)
 141 {
 142         const void *end = (const void *)((const char *)p + len);
 143         struct  spkm3_ctx *ctx;
 144
 145         if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))
 146                 goto out_err;
 147         memset(ctx, 0, sizeof(*ctx));
 148
 149         p = simple_get_netobj(p, end, &ctx->ctx_id);
 150         if (IS_ERR(p))
 151                 goto out_err_free_ctx;
 152
 153         p = simple_get_bytes(p, end, &ctx->qop, sizeof(ctx->qop));
 154         if (IS_ERR(p))
 155                 goto out_err_free_ctx_id;
 156
 157         p = simple_get_netobj(p, end, &ctx->mech_used);
 158         if (IS_ERR(p))
 159                 goto out_err_free_mech;
 160
 161         p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
 162         if (IS_ERR(p))
 163                 goto out_err_free_mech;
 164
 165         p = simple_get_bytes(p, end, &ctx->req_flags, sizeof(ctx->req_flags));
 166         if (IS_ERR(p))
 167                 goto out_err_free_mech;
 168
 169         p = simple_get_netobj(p, end, &ctx->share_key);
 170         if (IS_ERR(p))
 171                 goto out_err_free_s_key;
 172
 173         p = get_key(p, end, &ctx->derived_conf_key, &ctx->conf_alg);
 174         if (IS_ERR(p))
 175                 goto out_err_free_s_key;
 176
 177         p = get_key(p, end, &ctx->derived_integ_key, &ctx->intg_alg);
 178         if (IS_ERR(p))
 179                 goto out_err_free_key1;
 180
 181         p = simple_get_bytes(p, end, &ctx->keyestb_alg, sizeof(ctx->keyestb_alg));
 182         if (IS_ERR(p))
 183                 goto out_err_free_key2;
 184
 185         p = simple_get_bytes(p, end, &ctx->owf_alg, sizeof(ctx->owf_alg));
 186         if (IS_ERR(p))
 187                 goto out_err_free_key2;
 188
 189         if (p != end)
 190                 goto out_err_free_key2;
 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_key2:
 198         crypto_free_tfm(ctx->derived_integ_key);
 199 out_err_free_key1:
 200         crypto_free_tfm(ctx->derived_conf_key);
 201 out_err_free_s_key:
 202         kfree(ctx->share_key.data);
 203 out_err_free_mech:
 204         kfree(ctx->mech_used.data);
 205 out_err_free_ctx_id:
 206         kfree(ctx->ctx_id.data);
 207 out_err_free_ctx:
 208         kfree(ctx);
 209 out_err:
 210         return PTR_ERR(p);
 211 }
 212
 213 static void
 214 gss_delete_sec_context_spkm3(void *internal_ctx) {
 215         struct spkm3_ctx *sctx = internal_ctx;
 216
 217         if(sctx->derived_integ_key)
 218                 crypto_free_tfm(sctx->derived_integ_key);
 219         if(sctx->derived_conf_key)
 220                 crypto_free_tfm(sctx->derived_conf_key);
 221         if(sctx->share_key.data)
 222                 kfree(sctx->share_key.data);
 223         if(sctx->mech_used.data)
 224                 kfree(sctx->mech_used.data);
 225         kfree(sctx);
 226 }
 227
 228 static u32
 229 gss_verify_mic_spkm3(struct gss_ctx             *ctx,
 230                         struct xdr_buf          *signbuf,
 231                         struct xdr_netobj       *checksum,
 232                         u32             *qstate) {
 233         u32 maj_stat = 0;
 234         int qop_state = 0;
 235         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 236
 237         dprintk("RPC: gss_verify_mic_spkm3 calling spkm3_read_token\n");
 238         maj_stat = spkm3_read_token(sctx, checksum, signbuf, &qop_state,
 239                                    SPKM_MIC_TOK);
 240
 241         if (!maj_stat && qop_state)
 242             *qstate = qop_state;
 243
 244         dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
 245         return maj_stat;
 246 }
 247
 248 static u32
 249 gss_get_mic_spkm3(struct gss_ctx        *ctx,
 250                      u32                qop,
 251                      struct xdr_buf     *message_buffer,
 252                      struct xdr_netobj  *message_token) {
 253         u32 err = 0;
 254         struct spkm3_ctx *sctx = ctx->internal_ctx_id;
 255
 256         dprintk("RPC: gss_get_mic_spkm3\n");
 257
 258         err = spkm3_make_token(sctx, qop, message_buffer,
 259                               message_token, SPKM_MIC_TOK);
 260         return err;
 261 }
 262
 263 static struct gss_api_ops gss_spkm3_ops = {
 264         .gss_import_sec_context = gss_import_sec_context_spkm3,
 265         .gss_get_mic            = gss_get_mic_spkm3,
 266         .gss_verify_mic         = gss_verify_mic_spkm3,
 267         .gss_delete_sec_context = gss_delete_sec_context_spkm3,
 268 };
 269
 270 static struct pf_desc gss_spkm3_pfs[] = {
 271         {RPC_AUTH_GSS_SPKM, 0, RPC_GSS_SVC_NONE, "spkm3"},
 272         {RPC_AUTH_GSS_SPKMI, 0, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
 273 };
 274
 275 static struct gss_api_mech gss_spkm3_mech = {
 276         .gm_name        = "spkm3",
 277         .gm_owner       = THIS_MODULE,
 278         .gm_ops         = &gss_spkm3_ops,
 279         .gm_pf_num      = ARRAY_SIZE(gss_spkm3_pfs),
 280         .gm_pfs         = gss_spkm3_pfs,
 281 };
 282
 283 static int __init init_spkm3_module(void)
 284 {
 285         int status;
 286
 287         status = gss_mech_register(&gss_spkm3_mech);
 288         if (status)
 289                 printk("Failed to register spkm3 gss mechanism!\n");
 290         return 0;
 291 }
 292
 293 static void __exit cleanup_spkm3_module(void)
 294 {
 295         gss_mech_unregister(&gss_spkm3_mech);
 296 }
 297
 298 MODULE_LICENSE("GPL");
 299 module_init(init_spkm3_module);
 300 module_exit(cleanup_spkm3_module);