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Linux/net/sunrpc/auth_gss/gss_krb5_seal.c

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  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 
 67 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 68 # define RPCDBG_FACILITY        RPCDBG_AUTH
 69 #endif
 70 
 71 DEFINE_SPINLOCK(krb5_seq_lock);
 72 
 73 static void *
 74 setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token)
 75 {
 76         u16 *ptr;
 77         void *krb5_hdr;
 78         int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
 79 
 80         token->len = g_token_size(&ctx->mech_used, body_size);
 81 
 82         ptr = (u16 *)token->data;
 83         g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr);
 84 
 85         /* ptr now at start of header described in rfc 1964, section 1.2.1: */
 86         krb5_hdr = ptr;
 87         *ptr++ = KG_TOK_MIC_MSG;
 88         /*
 89          * signalg is stored as if it were converted from LE to host endian, even
 90          * though it's an opaque pair of bytes according to the RFC.
 91          */
 92         *ptr++ = (__force u16)cpu_to_le16(ctx->gk5e->signalg);
 93         *ptr++ = SEAL_ALG_NONE;
 94         *ptr = 0xffff;
 95 
 96         return krb5_hdr;
 97 }
 98 
 99 static void *
100 setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
101 {
102         u16 *ptr;
103         void *krb5_hdr;
104         u8 *p, flags = 0x00;
105 
106         if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
107                 flags |= 0x01;
108         if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
109                 flags |= 0x04;
110 
111         /* Per rfc 4121, sec 4.2.6.1, there is no header,
112          * just start the token */
113         krb5_hdr = ptr = (u16 *)token->data;
114 
115         *ptr++ = KG2_TOK_MIC;
116         p = (u8 *)ptr;
117         *p++ = flags;
118         *p++ = 0xff;
119         ptr = (u16 *)p;
120         *ptr++ = 0xffff;
121         *ptr = 0xffff;
122 
123         token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
124         return krb5_hdr;
125 }
126 
127 static u32
128 gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
129                 struct xdr_netobj *token)
130 {
131         char                    cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
132         struct xdr_netobj       md5cksum = {.len = sizeof(cksumdata),
133                                             .data = cksumdata};
134         void                    *ptr;
135         s32                     now;
136         u32                     seq_send;
137         u8                      *cksumkey;
138 
139         dprintk("RPC:       %s\n", __func__);
140         BUG_ON(ctx == NULL);
141 
142         now = get_seconds();
143 
144         ptr = setup_token(ctx, token);
145 
146         if (ctx->gk5e->keyed_cksum)
147                 cksumkey = ctx->cksum;
148         else
149                 cksumkey = NULL;
150 
151         if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
152                           KG_USAGE_SIGN, &md5cksum))
153                 return GSS_S_FAILURE;
154 
155         memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
156 
157         spin_lock(&krb5_seq_lock);
158         seq_send = ctx->seq_send++;
159         spin_unlock(&krb5_seq_lock);
160 
161         if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff,
162                               seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))
163                 return GSS_S_FAILURE;
164 
165         return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
166 }
167 
168 static u32
169 gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
170                 struct xdr_netobj *token)
171 {
172         char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
173         struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
174                                        .data = cksumdata};
175         void *krb5_hdr;
176         s32 now;
177         u64 seq_send;
178         u8 *cksumkey;
179         unsigned int cksum_usage;
180 
181         dprintk("RPC:       %s\n", __func__);
182 
183         krb5_hdr = setup_token_v2(ctx, token);
184 
185         /* Set up the sequence number. Now 64-bits in clear
186          * text and w/o direction indicator */
187         spin_lock(&krb5_seq_lock);
188         seq_send = ctx->seq_send64++;
189         spin_unlock(&krb5_seq_lock);
190         *((__be64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
191 
192         if (ctx->initiate) {
193                 cksumkey = ctx->initiator_sign;
194                 cksum_usage = KG_USAGE_INITIATOR_SIGN;
195         } else {
196                 cksumkey = ctx->acceptor_sign;
197                 cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
198         }
199 
200         if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
201                              text, 0, cksumkey, cksum_usage, &cksumobj))
202                 return GSS_S_FAILURE;
203 
204         memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
205 
206         now = get_seconds();
207 
208         return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
209 }
210 
211 u32
212 gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
213                      struct xdr_netobj *token)
214 {
215         struct krb5_ctx         *ctx = gss_ctx->internal_ctx_id;
216 
217         switch (ctx->enctype) {
218         default:
219                 BUG();
220         case ENCTYPE_DES_CBC_RAW:
221         case ENCTYPE_DES3_CBC_RAW:
222         case ENCTYPE_ARCFOUR_HMAC:
223                 return gss_get_mic_v1(ctx, text, token);
224         case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
225         case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
226                 return gss_get_mic_v2(ctx, text, token);
227         }
228 }
229 
230 

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