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Linux/net/sunrpc/auth_gss/gss_krb5_unseal.c

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  1 /*
  2  *  linux/net/sunrpc/gss_krb5_unseal.c
  3  *
  4  *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.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  */
 11 
 12 /*
 13  * Copyright 1993 by OpenVision Technologies, Inc.
 14  *
 15  * Permission to use, copy, modify, distribute, and sell this software
 16  * and its documentation for any purpose is hereby granted without fee,
 17  * provided that the above copyright notice appears in all copies and
 18  * that both that copyright notice and this permission notice appear in
 19  * supporting documentation, and that the name of OpenVision not be used
 20  * in advertising or publicity pertaining to distribution of the software
 21  * without specific, written prior permission. OpenVision makes no
 22  * representations about the suitability of this software for any
 23  * purpose.  It is provided "as is" without express or implied warranty.
 24  *
 25  * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 26  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 27  * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 28  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
 29  * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 30  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 31  * PERFORMANCE OF THIS SOFTWARE.
 32  */
 33 
 34 /*
 35  * Copyright (C) 1998 by the FundsXpress, INC.
 36  *
 37  * All rights reserved.
 38  *
 39  * Export of this software from the United States of America may require
 40  * a specific license from the United States Government.  It is the
 41  * responsibility of any person or organization contemplating export to
 42  * obtain such a license before exporting.
 43  *
 44  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 45  * distribute this software and its documentation for any purpose and
 46  * without fee is hereby granted, provided that the above copyright
 47  * notice appear in all copies and that both that copyright notice and
 48  * this permission notice appear in supporting documentation, and that
 49  * the name of FundsXpress. not be used in advertising or publicity pertaining
 50  * to distribution of the software without specific, written prior
 51  * permission.  FundsXpress makes no representations about the suitability of
 52  * this software for any purpose.  It is provided "as is" without express
 53  * or implied warranty.
 54  *
 55  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 56  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 57  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 58  */
 59 
 60 #include <linux/types.h>
 61 #include <linux/jiffies.h>
 62 #include <linux/sunrpc/gss_krb5.h>
 63 #include <linux/crypto.h>
 64 
 65 #ifdef RPC_DEBUG
 66 # define RPCDBG_FACILITY        RPCDBG_AUTH
 67 #endif
 68 
 69 
 70 /* read_token is a mic token, and message_buffer is the data that the mic was
 71  * supposedly taken over. */
 72 
 73 static u32
 74 gss_verify_mic_v1(struct krb5_ctx *ctx,
 75                 struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
 76 {
 77         int                     signalg;
 78         int                     sealalg;
 79         char                    cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
 80         struct xdr_netobj       md5cksum = {.len = sizeof(cksumdata),
 81                                             .data = cksumdata};
 82         s32                     now;
 83         int                     direction;
 84         u32                     seqnum;
 85         unsigned char           *ptr = (unsigned char *)read_token->data;
 86         int                     bodysize;
 87         u8                      *cksumkey;
 88 
 89         dprintk("RPC:       krb5_read_token\n");
 90 
 91         if (g_verify_token_header(&ctx->mech_used, &bodysize, &ptr,
 92                                         read_token->len))
 93                 return GSS_S_DEFECTIVE_TOKEN;
 94 
 95         if ((ptr[0] != ((KG_TOK_MIC_MSG >> 8) & 0xff)) ||
 96             (ptr[1] !=  (KG_TOK_MIC_MSG & 0xff)))
 97                 return GSS_S_DEFECTIVE_TOKEN;
 98 
 99         /* XXX sanity-check bodysize?? */
100 
101         signalg = ptr[2] + (ptr[3] << 8);
102         if (signalg != ctx->gk5e->signalg)
103                 return GSS_S_DEFECTIVE_TOKEN;
104 
105         sealalg = ptr[4] + (ptr[5] << 8);
106         if (sealalg != SEAL_ALG_NONE)
107                 return GSS_S_DEFECTIVE_TOKEN;
108 
109         if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
110                 return GSS_S_DEFECTIVE_TOKEN;
111 
112         if (ctx->gk5e->keyed_cksum)
113                 cksumkey = ctx->cksum;
114         else
115                 cksumkey = NULL;
116 
117         if (make_checksum(ctx, ptr, 8, message_buffer, 0,
118                           cksumkey, KG_USAGE_SIGN, &md5cksum))
119                 return GSS_S_FAILURE;
120 
121         if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
122                                         ctx->gk5e->cksumlength))
123                 return GSS_S_BAD_SIG;
124 
125         /* it got through unscathed.  Make sure the context is unexpired */
126 
127         now = get_seconds();
128 
129         if (now > ctx->endtime)
130                 return GSS_S_CONTEXT_EXPIRED;
131 
132         /* do sequencing checks */
133 
134         if (krb5_get_seq_num(ctx, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8,
135                              &direction, &seqnum))
136                 return GSS_S_FAILURE;
137 
138         if ((ctx->initiate && direction != 0xff) ||
139             (!ctx->initiate && direction != 0))
140                 return GSS_S_BAD_SIG;
141 
142         return GSS_S_COMPLETE;
143 }
144 
145 static u32
146 gss_verify_mic_v2(struct krb5_ctx *ctx,
147                 struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
148 {
149         char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
150         struct xdr_netobj cksumobj = {.len = sizeof(cksumdata),
151                                       .data = cksumdata};
152         s32 now;
153         u64 seqnum;
154         u8 *ptr = read_token->data;
155         u8 *cksumkey;
156         u8 flags;
157         int i;
158         unsigned int cksum_usage;
159 
160         dprintk("RPC:       %s\n", __func__);
161 
162         if (be16_to_cpu(*((__be16 *)ptr)) != KG2_TOK_MIC)
163                 return GSS_S_DEFECTIVE_TOKEN;
164 
165         flags = ptr[2];
166         if ((!ctx->initiate && (flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)) ||
167             (ctx->initiate && !(flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)))
168                 return GSS_S_BAD_SIG;
169 
170         if (flags & KG2_TOKEN_FLAG_SEALED) {
171                 dprintk("%s: token has unexpected sealed flag\n", __func__);
172                 return GSS_S_FAILURE;
173         }
174 
175         for (i = 3; i < 8; i++)
176                 if (ptr[i] != 0xff)
177                         return GSS_S_DEFECTIVE_TOKEN;
178 
179         if (ctx->initiate) {
180                 cksumkey = ctx->acceptor_sign;
181                 cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
182         } else {
183                 cksumkey = ctx->initiator_sign;
184                 cksum_usage = KG_USAGE_INITIATOR_SIGN;
185         }
186 
187         if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
188                              cksumkey, cksum_usage, &cksumobj))
189                 return GSS_S_FAILURE;
190 
191         if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,
192                                 ctx->gk5e->cksumlength))
193                 return GSS_S_BAD_SIG;
194 
195         /* it got through unscathed.  Make sure the context is unexpired */
196         now = get_seconds();
197         if (now > ctx->endtime)
198                 return GSS_S_CONTEXT_EXPIRED;
199 
200         /* do sequencing checks */
201 
202         seqnum = be64_to_cpup((__be64 *)ptr + 8);
203 
204         return GSS_S_COMPLETE;
205 }
206 
207 u32
208 gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
209                         struct xdr_buf *message_buffer,
210                         struct xdr_netobj *read_token)
211 {
212         struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
213 
214         switch (ctx->enctype) {
215         default:
216                 BUG();
217         case ENCTYPE_DES_CBC_RAW:
218         case ENCTYPE_DES3_CBC_RAW:
219         case ENCTYPE_ARCFOUR_HMAC:
220                 return gss_verify_mic_v1(ctx, message_buffer, read_token);
221         case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
222         case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
223                 return gss_verify_mic_v2(ctx, message_buffer, read_token);
224         }
225 }
226 
227 

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