264 lines
7.1 KiB
C
264 lines
7.1 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_NOFS);
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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_NOFS))) {
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p = ERR_PTR(-ENOMEM);
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goto out_err;
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}
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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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/* The downcall format was designed before we completely understood
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* the uses of the context fields; so it includes some stuff we
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* just give some minimal sanity-checking, and some we ignore
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* completely (like the next twenty bytes): */
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if (unlikely(p + 20 > end || p + 20 < p))
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goto out_err_free_ctx;
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p += 20;
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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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p = ERR_PTR(-ENOSYS);
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goto out_err_free_ctx;
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}
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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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p = ERR_PTR(-ENOSYS);
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goto out_err_free_ctx;
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}
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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 const 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_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
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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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