/* *  linux/net/sunrpc/gss_krb5_mech.c * *  Copyright (c) 2001 The Regents of the University of Michigan. *  All rights reserved. * *  Andy Adamson <andros@umich.edu> *  J. Bruce Fields <bfields@umich.edu> * *  Redistribution and use in source and binary forms, with or without *  modification, are permitted provided that the following conditions *  are met: * *  1. Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. *  2. Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. *  3. Neither the name of the University nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <linux/slab.h>#include <linux/sunrpc/auth.h>#include <linux/in.h>#include <linux/sunrpc/gss_krb5.h>#include <linux/sunrpc/xdr.h>#include <linux/crypto.h>#ifdef RPC_DEBUG# define RPCDBG_FACILITY	RPCDBG_AUTH#endifstruct xdr_netobj gss_mech_krb5_oid =   {9, "\052\206\110\206\367\022\001\002\002"};static inline intget_bytes(char **ptr, const char *end, void *res, int len){	char *p, *q;	p = *ptr;	q = p + len;	if (q > end || q < p)		return -1;	memcpy(res, p, len);	*ptr = q;	return 0;}static inline intget_netobj(char **ptr, const char *end, struct xdr_netobj *res){	char *p, *q;	p = *ptr;	if (get_bytes(&p, end, &res->len, sizeof(res->len)))		return -1;	q = p + res->len;	if (q > end || q < p)		return -1;	if (!(res->data = kmalloc(res->len, GFP_KERNEL)))		return -1;	memcpy(res->data, p, res->len);	*ptr = q;	return 0;}static inline intget_key(char **p, char *end, struct crypto_tfm **res){	struct xdr_netobj	key;	int			alg, alg_mode;	char			*alg_name;	if (get_bytes(p, end, &alg, sizeof(alg)))		goto out_err;	if ((get_netobj(p, end, &key)))		goto out_err;	switch (alg) {		case ENCTYPE_DES_CBC_RAW:			alg_name = "des";			alg_mode = CRYPTO_TFM_MODE_CBC;			break;		default:			dprintk("RPC:      get_key: unsupported algorithm %d\n", alg);			goto out_err_free_key;	}	if (!(*res = crypto_alloc_tfm(alg_name, alg_mode)))		goto out_err_free_key;	if (crypto_cipher_setkey(*res, key.data, key.len))		goto out_err_free_tfm;	kfree(key.data);	return 0;out_err_free_tfm:	crypto_free_tfm(*res);out_err_free_key:	kfree(key.data);out_err:	return -1;}static u32gss_import_sec_context_kerberos(struct xdr_netobj *inbuf,				struct gss_ctx *ctx_id){	char	*p = inbuf->data;	char	*end = inbuf->data + inbuf->len;	struct	krb5_ctx *ctx;	if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL)))		goto out_err;	memset(ctx, 0, sizeof(*ctx));	if (get_bytes(&p, end, &ctx->initiate, sizeof(ctx->initiate)))		goto out_err_free_ctx;	if (get_bytes(&p, end, &ctx->seed_init, sizeof(ctx->seed_init)))		goto out_err_free_ctx;	if (get_bytes(&p, end, ctx->seed, sizeof(ctx->seed)))		goto out_err_free_ctx;	if (get_bytes(&p, end, &ctx->signalg, sizeof(ctx->signalg)))		goto out_err_free_ctx;	if (get_bytes(&p, end, &ctx->sealalg, sizeof(ctx->sealalg)))		goto out_err_free_ctx;	if (get_bytes(&p, end, &ctx->endtime, sizeof(ctx->endtime)))		goto out_err_free_ctx;	if (get_bytes(&p, end, &ctx->seq_send, sizeof(ctx->seq_send)))		goto out_err_free_ctx;	if (get_netobj(&p, end, &ctx->mech_used))		goto out_err_free_ctx;	if (get_key(&p, end, &ctx->enc))		goto out_err_free_mech;	if (get_key(&p, end, &ctx->seq))		goto out_err_free_key1;	if (p != end)		goto out_err_free_key2;	ctx_id->internal_ctx_id = ctx;	dprintk("RPC:      Succesfully imported new context.\n");	return 0;out_err_free_key2:	crypto_free_tfm(ctx->seq);out_err_free_key1:	crypto_free_tfm(ctx->enc);out_err_free_mech:	kfree(ctx->mech_used.data);out_err_free_ctx:	kfree(ctx);out_err:	return GSS_S_FAILURE;}static voidgss_delete_sec_context_kerberos(void *internal_ctx) {	struct krb5_ctx *kctx = internal_ctx;	if (kctx->seq)		crypto_free_tfm(kctx->seq);	if (kctx->enc)		crypto_free_tfm(kctx->enc);	if (kctx->mech_used.data)		kfree(kctx->mech_used.data);	kfree(kctx);}static u32gss_verify_mic_kerberos(struct gss_ctx		*ctx,			struct xdr_buf		*message,			struct xdr_netobj	*mic_token,			u32			*qstate) {	u32 maj_stat = 0;	int qop_state;	struct krb5_ctx *kctx = ctx->internal_ctx_id;	maj_stat = krb5_read_token(kctx, mic_token, message, &qop_state,				   KG_TOK_MIC_MSG);	if (!maj_stat && qop_state)	    *qstate = qop_state;	dprintk("RPC:      gss_verify_mic_kerberos returning %d\n", maj_stat);	return maj_stat;}static u32gss_get_mic_kerberos(struct gss_ctx	*ctx,		     u32		qop,		     struct xdr_buf 	*message,		     struct xdr_netobj	*mic_token) {	u32 err = 0;	struct krb5_ctx *kctx = ctx->internal_ctx_id;	err = krb5_make_token(kctx, qop, message, mic_token, KG_TOK_MIC_MSG);	dprintk("RPC:      gss_get_mic_kerberos returning %d\n",err);	return err;}static struct gss_api_ops gss_kerberos_ops = {	.gss_import_sec_context	= gss_import_sec_context_kerberos,	.gss_get_mic		= gss_get_mic_kerberos,	.gss_verify_mic		= gss_verify_mic_kerberos,	.gss_delete_sec_context	= gss_delete_sec_context_kerberos,};static struct pf_desc gss_kerberos_pfs[] = {	[0] = {		.pseudoflavor = RPC_AUTH_GSS_KRB5,		.service = RPC_GSS_SVC_NONE,		.name = "krb5",	},	[1] = {		.pseudoflavor = RPC_AUTH_GSS_KRB5I,		.service = RPC_GSS_SVC_INTEGRITY,		.name = "krb5i",	},};static struct gss_api_mech gss_kerberos_mech = {	.gm_name	= "krb5",	.gm_owner	= THIS_MODULE,	.gm_ops		= &gss_kerberos_ops,	.gm_pf_num	= ARRAY_SIZE(gss_kerberos_pfs),	.gm_pfs		= gss_kerberos_pfs,};static int __init init_kerberos_module(void){	int status;	status = gss_mech_register(&gss_kerberos_mech);	if (status)		printk("Failed to register kerberos gss mechanism!\n");	return status;}static void __exit cleanup_kerberos_module(void){	gss_mech_unregister(&gss_kerberos_mech);}MODULE_LICENSE("GPL");module_init(init_kerberos_module);module_exit(cleanup_kerberos_module);