d922a84a8b
The sealalg is checked in several places, giving the impression it could be either SEAL_ALG_NONE or SEAL_ALG_DES. But in fact SEAL_ALG_NONE seems to be sufficient only for making mic's, and all the contexts we get must be capable of wrapping as well. So the sealalg must be SEAL_ALG_DES. As with signalg, just check for the right value on the downcall and ignore it otherwise. Similarly, tighten expectations for the sealalg on incoming tokens, in case we do support other values eventually. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/*
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* linux/net/sunrpc/gss_krb5_mech.c
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*
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* Copyright (c) 2001 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@umich.edu>
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* J. Bruce Fields <bfields@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/gss_krb5.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/crypto.h>
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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static const void *
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simple_get_bytes(const void *p, const void *end, void *res, int len)
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{
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const void *q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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memcpy(res, p, len);
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return q;
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}
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static const void *
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simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
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{
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const void *q;
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unsigned int len;
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p = simple_get_bytes(p, end, &len, sizeof(len));
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if (IS_ERR(p))
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return p;
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q = (const void *)((const char *)p + len);
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if (unlikely(q > end || q < p))
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return ERR_PTR(-EFAULT);
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res->data = kmemdup(p, len, GFP_KERNEL);
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if (unlikely(res->data == NULL))
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return ERR_PTR(-ENOMEM);
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res->len = len;
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return q;
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}
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static inline const void *
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get_key(const void *p, const void *end, struct crypto_blkcipher **res)
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{
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struct xdr_netobj key;
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int alg;
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char *alg_name;
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p = simple_get_bytes(p, end, &alg, sizeof(alg));
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if (IS_ERR(p))
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goto out_err;
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p = simple_get_netobj(p, end, &key);
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if (IS_ERR(p))
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goto out_err;
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switch (alg) {
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case ENCTYPE_DES_CBC_RAW:
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alg_name = "cbc(des)";
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break;
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default:
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printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
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goto out_err_free_key;
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}
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*res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(*res)) {
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printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
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*res = NULL;
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goto out_err_free_key;
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}
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if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
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printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
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goto out_err_free_tfm;
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}
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kfree(key.data);
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return p;
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out_err_free_tfm:
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crypto_free_blkcipher(*res);
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out_err_free_key:
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kfree(key.data);
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p = ERR_PTR(-EINVAL);
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out_err:
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return p;
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}
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static int
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gss_import_sec_context_kerberos(const void *p,
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size_t len,
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struct gss_ctx *ctx_id)
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{
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const void *end = (const void *)((const char *)p + len);
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struct krb5_ctx *ctx;
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int tmp;
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if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
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goto out_err;
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p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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if (tmp != SGN_ALG_DES_MAC_MD5)
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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if (tmp != SEAL_ALG_DES)
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = simple_get_netobj(p, end, &ctx->mech_used);
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if (IS_ERR(p))
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goto out_err_free_ctx;
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p = get_key(p, end, &ctx->enc);
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if (IS_ERR(p))
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goto out_err_free_mech;
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p = get_key(p, end, &ctx->seq);
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if (IS_ERR(p))
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goto out_err_free_key1;
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if (p != end) {
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p = ERR_PTR(-EFAULT);
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goto out_err_free_key2;
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}
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ctx_id->internal_ctx_id = ctx;
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dprintk("RPC: Successfully imported new context.\n");
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return 0;
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out_err_free_key2:
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crypto_free_blkcipher(ctx->seq);
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out_err_free_key1:
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crypto_free_blkcipher(ctx->enc);
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out_err_free_mech:
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kfree(ctx->mech_used.data);
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out_err_free_ctx:
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kfree(ctx);
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out_err:
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return PTR_ERR(p);
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}
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static void
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gss_delete_sec_context_kerberos(void *internal_ctx) {
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struct krb5_ctx *kctx = internal_ctx;
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crypto_free_blkcipher(kctx->seq);
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crypto_free_blkcipher(kctx->enc);
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kfree(kctx->mech_used.data);
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kfree(kctx);
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}
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static struct gss_api_ops gss_kerberos_ops = {
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.gss_import_sec_context = gss_import_sec_context_kerberos,
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.gss_get_mic = gss_get_mic_kerberos,
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.gss_verify_mic = gss_verify_mic_kerberos,
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.gss_wrap = gss_wrap_kerberos,
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.gss_unwrap = gss_unwrap_kerberos,
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.gss_delete_sec_context = gss_delete_sec_context_kerberos,
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};
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static struct pf_desc gss_kerberos_pfs[] = {
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[0] = {
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.pseudoflavor = RPC_AUTH_GSS_KRB5,
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.service = RPC_GSS_SVC_NONE,
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.name = "krb5",
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},
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[1] = {
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.pseudoflavor = RPC_AUTH_GSS_KRB5I,
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.service = RPC_GSS_SVC_INTEGRITY,
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.name = "krb5i",
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},
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[2] = {
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.pseudoflavor = RPC_AUTH_GSS_KRB5P,
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.service = RPC_GSS_SVC_PRIVACY,
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.name = "krb5p",
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},
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};
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static struct gss_api_mech gss_kerberos_mech = {
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.gm_name = "krb5",
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.gm_owner = THIS_MODULE,
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.gm_ops = &gss_kerberos_ops,
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.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
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.gm_pfs = gss_kerberos_pfs,
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};
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static int __init init_kerberos_module(void)
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{
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int status;
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status = gss_mech_register(&gss_kerberos_mech);
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if (status)
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printk("Failed to register kerberos gss mechanism!\n");
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return status;
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}
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static void __exit cleanup_kerberos_module(void)
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{
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gss_mech_unregister(&gss_kerberos_mech);
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}
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MODULE_LICENSE("GPL");
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module_init(init_kerberos_module);
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module_exit(cleanup_kerberos_module);
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