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 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/slab.h> 63 #include <linux/jiffies.h> 64 #include <linux/sunrpc/gss_krb5.h> 65 #include <linux/random.h> 66 #include <asm/scatterlist.h> 67 #include <linux/crypto.h> 68 69 #ifdef RPC_DEBUG 70 # define RPCDBG_FACILITY RPCDBG_AUTH 71 #endif 72 73 DEFINE_SPINLOCK(krb5_seq_lock); 74 75 u32 76 gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, 77 struct xdr_netobj *token) 78 { 79 struct krb5_ctx *ctx = gss_ctx->internal_ctx_id; 80 s32 checksum_type; 81 char cksumdata[16]; 82 struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata}; 83 unsigned char *ptr, *krb5_hdr, *msg_start; 84 s32 now; 85 u32 seq_send; 86 87 dprintk("RPC: gss_krb5_seal\n"); 88 89 now = get_seconds(); 90 91 switch (ctx->signalg) { 92 case SGN_ALG_DES_MAC_MD5: 93 checksum_type = CKSUMTYPE_RSA_MD5; 94 break; 95 default: 96 dprintk("RPC: gss_krb5_seal: ctx->signalg %d not" 97 " supported\n", ctx->signalg); 98 goto out_err; 99 } 100 if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) { 101 dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n", 102 ctx->sealalg); 103 goto out_err; 104 } 105 106 token->len = g_token_size(&ctx->mech_used, 22); 107 108 ptr = token->data; 109 g_make_token_header(&ctx->mech_used, 22, &ptr); 110 111 *ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff); 112 *ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff); 113 114 /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */ 115 krb5_hdr = ptr - 2; 116 msg_start = krb5_hdr + 24; 117 118 *(u16 *)(krb5_hdr + 2) = htons(ctx->signalg); 119 memset(krb5_hdr + 4, 0xff, 4); 120 121 if (make_checksum(checksum_type, krb5_hdr, 8, text, 0, &md5cksum)) 122 goto out_err; 123 124 switch (ctx->signalg) { 125 case SGN_ALG_DES_MAC_MD5: 126 if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, 127 md5cksum.data, md5cksum.len)) 128 goto out_err; 129 memcpy(krb5_hdr + 16, 130 md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH, 131 KRB5_CKSUM_LENGTH); 132 133 dprintk("RPC: make_seal_token: cksum data: \n"); 134 print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0); 135 break; 136 default: 137 BUG(); 138 } 139 140 spin_lock(&krb5_seq_lock); 141 seq_send = ctx->seq_send++; 142 spin_unlock(&krb5_seq_lock); 143 144 if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff, 145 seq_send, krb5_hdr + 16, krb5_hdr + 8))) 146 goto out_err; 147 148 return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE); 149 out_err: 150 return GSS_S_FAILURE; 151 } 152