244 lines
6.5 KiB
C
244 lines
6.5 KiB
C
/*
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* linux/net/sunrpc/gss_spkm3_mech.c
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*
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* Copyright (c) 2003 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/in.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/gss_spkm3.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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res->len = len;
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if (len == 0) {
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res->data = NULL;
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return p;
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}
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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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return q;
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}
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static int
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gss_import_sec_context_spkm3(const void *p, 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 spkm3_ctx *ctx;
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int version;
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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, &version, sizeof(version));
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if (IS_ERR(p))
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goto out_err_free_ctx;
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if (version != 1) {
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dprintk("RPC: unknown spkm3 token format: "
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"obsolete nfs-utils?\n");
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goto out_err_free_ctx;
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}
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p = simple_get_netobj(p, end, &ctx->ctx_id);
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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->endtime, sizeof(ctx->endtime));
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if (IS_ERR(p))
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goto out_err_free_ctx_id;
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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_id;
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p = simple_get_bytes(p, end, &ctx->ret_flags, sizeof(ctx->ret_flags));
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if (IS_ERR(p))
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goto out_err_free_mech;
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p = simple_get_netobj(p, end, &ctx->conf_alg);
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if (IS_ERR(p))
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goto out_err_free_mech;
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p = simple_get_netobj(p, end, &ctx->derived_conf_key);
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if (IS_ERR(p))
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goto out_err_free_conf_alg;
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p = simple_get_netobj(p, end, &ctx->intg_alg);
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if (IS_ERR(p))
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goto out_err_free_conf_key;
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p = simple_get_netobj(p, end, &ctx->derived_integ_key);
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if (IS_ERR(p))
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goto out_err_free_intg_alg;
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if (p != end)
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goto out_err_free_intg_key;
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ctx_id->internal_ctx_id = ctx;
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dprintk("RPC: Successfully imported new spkm context.\n");
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return 0;
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out_err_free_intg_key:
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kfree(ctx->derived_integ_key.data);
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out_err_free_intg_alg:
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kfree(ctx->intg_alg.data);
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out_err_free_conf_key:
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kfree(ctx->derived_conf_key.data);
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out_err_free_conf_alg:
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kfree(ctx->conf_alg.data);
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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_id:
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kfree(ctx->ctx_id.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_spkm3(void *internal_ctx)
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{
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struct spkm3_ctx *sctx = internal_ctx;
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kfree(sctx->derived_integ_key.data);
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kfree(sctx->intg_alg.data);
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kfree(sctx->derived_conf_key.data);
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kfree(sctx->conf_alg.data);
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kfree(sctx->mech_used.data);
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kfree(sctx->ctx_id.data);
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kfree(sctx);
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}
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static u32
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gss_verify_mic_spkm3(struct gss_ctx *ctx,
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struct xdr_buf *signbuf,
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struct xdr_netobj *checksum)
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{
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u32 maj_stat = 0;
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struct spkm3_ctx *sctx = ctx->internal_ctx_id;
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maj_stat = spkm3_read_token(sctx, checksum, signbuf, SPKM_MIC_TOK);
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dprintk("RPC: gss_verify_mic_spkm3 returning %d\n", maj_stat);
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return maj_stat;
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}
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static u32
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gss_get_mic_spkm3(struct gss_ctx *ctx,
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struct xdr_buf *message_buffer,
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struct xdr_netobj *message_token)
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{
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u32 err = 0;
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struct spkm3_ctx *sctx = ctx->internal_ctx_id;
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err = spkm3_make_token(sctx, message_buffer,
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message_token, SPKM_MIC_TOK);
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dprintk("RPC: gss_get_mic_spkm3 returning %d\n", err);
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return err;
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}
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static const struct gss_api_ops gss_spkm3_ops = {
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.gss_import_sec_context = gss_import_sec_context_spkm3,
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.gss_get_mic = gss_get_mic_spkm3,
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.gss_verify_mic = gss_verify_mic_spkm3,
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.gss_delete_sec_context = gss_delete_sec_context_spkm3,
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};
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static struct pf_desc gss_spkm3_pfs[] = {
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{RPC_AUTH_GSS_SPKM, RPC_GSS_SVC_NONE, "spkm3"},
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{RPC_AUTH_GSS_SPKMI, RPC_GSS_SVC_INTEGRITY, "spkm3i"},
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};
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static struct gss_api_mech gss_spkm3_mech = {
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.gm_name = "spkm3",
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.gm_owner = THIS_MODULE,
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.gm_oid = {7, "\053\006\001\005\005\001\003"},
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.gm_ops = &gss_spkm3_ops,
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.gm_pf_num = ARRAY_SIZE(gss_spkm3_pfs),
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.gm_pfs = gss_spkm3_pfs,
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};
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static int __init init_spkm3_module(void)
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{
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int status;
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status = gss_mech_register(&gss_spkm3_mech);
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if (status)
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printk("Failed to register spkm3 gss mechanism!\n");
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return status;
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}
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static void __exit cleanup_spkm3_module(void)
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{
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gss_mech_unregister(&gss_spkm3_mech);
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}
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MODULE_LICENSE("GPL");
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module_init(init_spkm3_module);
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module_exit(cleanup_spkm3_module);
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