1 /* 2 * linux/net/sunrpc/gss_krb5_seal.c 3 * 4 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c 5 * 6 * Copyright (c) 2000-2008 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Andy Adamson <andros@umich.edu> 10 * J. Bruce Fields <bfields@umich.edu> 11 */ 12 13 /* 14 * Copyright 1993 by OpenVision Technologies, Inc. 15 * 16 * Permission to use, copy, modify, distribute, and sell this software 17 * and its documentation for any purpose is hereby granted without fee, 18 * provided that the above copyright notice appears in all copies and 19 * that both that copyright notice and this permission notice appear in 20 * supporting documentation, and that the name of OpenVision not be used 21 * in advertising or publicity pertaining to distribution of the software 22 * without specific, written prior permission. OpenVision makes no 23 * representations about the suitability of this software for any 24 * purpose. It is provided "as is" without express or implied warranty. 25 * 26 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 27 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 28 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR 29 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 30 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 31 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 32 * PERFORMANCE OF THIS SOFTWARE. 33 */ 34 35 /* 36 * Copyright (C) 1998 by the FundsXpress, INC. 37 * 38 * All rights reserved. 39 * 40 * Export of this software from the United States of America may require 41 * a specific license from the United States Government. It is the 42 * responsibility of any person or organization contemplating export to 43 * obtain such a license before exporting. 44 * 45 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 46 * distribute this software and its documentation for any purpose and 47 * without fee is hereby granted, provided that the above copyright 48 * notice appear in all copies and that both that copyright notice and 49 * this permission notice appear in supporting documentation, and that 50 * the name of FundsXpress. not be used in advertising or publicity pertaining 51 * to distribution of the software without specific, written prior 52 * permission. FundsXpress makes no representations about the suitability of 53 * this software for any purpose. It is provided "as is" without express 54 * or implied warranty. 55 * 56 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 58 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 59 */ 60 61 #include <linux/types.h> 62 #include <linux/jiffies.h> 63 #include <linux/sunrpc/gss_krb5.h> 64 #include <linux/random.h> 65 #include <linux/crypto.h> 66 #include <linux/atomic.h> 67 68 #include "gss_krb5_internal.h" 69 70 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 71 # define RPCDBG_FACILITY RPCDBG_AUTH 72 #endif 73 74 static void * 75 setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token) 76 { 77 u16 *ptr; 78 void *krb5_hdr; 79 u8 *p, flags = 0x00; 80 81 if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0) 82 flags |= 0x01; 83 if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY) 84 flags |= 0x04; 85 86 /* Per rfc 4121, sec 4.2.6.1, there is no header, 87 * just start the token. 88 */ 89 krb5_hdr = (u16 *)token->data; 90 ptr = krb5_hdr; 91 92 *ptr++ = KG2_TOK_MIC; 93 p = (u8 *)ptr; 94 *p++ = flags; 95 *p++ = 0xff; 96 ptr = (u16 *)p; 97 *ptr++ = 0xffff; 98 *ptr = 0xffff; 99 100 token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength; 101 return krb5_hdr; 102 } 103 104 u32 105 gss_krb5_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text, 106 struct xdr_netobj *token) 107 { 108 struct crypto_ahash *tfm = ctx->initiate ? 109 ctx->initiator_sign : ctx->acceptor_sign; 110 struct xdr_netobj cksumobj = { 111 .len = ctx->gk5e->cksumlength, 112 }; 113 __be64 seq_send_be64; 114 void *krb5_hdr; 115 time64_t now; 116 117 dprintk("RPC: %s\n", __func__); 118 119 krb5_hdr = setup_token_v2(ctx, token); 120 121 /* Set up the sequence number. Now 64-bits in clear 122 * text and w/o direction indicator */ 123 seq_send_be64 = cpu_to_be64(atomic64_fetch_inc(&ctx->seq_send64)); 124 memcpy(krb5_hdr + 8, (char *) &seq_send_be64, 8); 125 126 cksumobj.data = krb5_hdr + GSS_KRB5_TOK_HDR_LEN; 127 if (gss_krb5_checksum(tfm, krb5_hdr, GSS_KRB5_TOK_HDR_LEN, 128 text, 0, &cksumobj)) 129 return GSS_S_FAILURE; 130 131 now = ktime_get_real_seconds(); 132 return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; 133 } 134