1 /*
2 * lib/krb5/krb/ser_cksum.c
3 *
4 * Copyright 1995 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 *
26 */
27
28 /*
29 * ser_cksum.c - Serialize a krb5_checksum structure.
30 */
31 #include "k5-int.h"
32 #include "int-proto.h"
33
34 /*
35 * Routines to deal with externalizing the krb5_checksum:
36 * krb5_checksum_esize();
37 * krb5_checksum_externalize();
38 * krb5_checksum_internalize();
39 */
40 static krb5_error_code krb5_checksum_esize
41 (krb5_context, krb5_pointer, size_t *);
42 static krb5_error_code krb5_checksum_externalize
43 (krb5_context, krb5_pointer, krb5_octet **, size_t *);
44 static krb5_error_code krb5_checksum_internalize
45 (krb5_context,krb5_pointer *, krb5_octet **, size_t *);
46
47 /* Local data */
48 static const krb5_ser_entry krb5_checksum_ser_entry = {
49 KV5M_CHECKSUM, /* Type */
50 krb5_checksum_esize, /* Sizer routine */
51 krb5_checksum_externalize, /* Externalize routine */
52 krb5_checksum_internalize /* Internalize routine */
53 };
54
55 /*
56 * krb5_checksum_esize() - Determine the size required to externalize
57 * the krb5_checksum.
58 */
59 /*ARGSUSED*/
60 static krb5_error_code
krb5_checksum_esize(krb5_context kcontext,krb5_pointer arg,size_t * sizep)61 krb5_checksum_esize(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
62 {
63 krb5_error_code kret;
64 krb5_checksum *checksum;
65
66 /*
67 * krb5_checksum requires:
68 * krb5_int32 for KV5M_CHECKSUM
69 * krb5_int32 for checksum_type
70 * krb5_int32 for length
71 * krb5_int32 for KV5M_CHECKSUM
72 * checksum->length for contents
73 */
74 kret = EINVAL;
75 /* Solaris Kerberos */
76 checksum = (krb5_checksum *) arg;
77 if (checksum) {
78 *sizep += (sizeof(krb5_int32) +
79 sizeof(krb5_int32) +
80 sizeof(krb5_int32) +
81 sizeof(krb5_int32) +
82 (size_t) checksum->length);
83 kret = 0;
84 }
85 return(kret);
86 }
87
88 /*
89 * krb5_checksum_externalize() - Externalize the krb5_checksum.
90 */
91 static krb5_error_code
krb5_checksum_externalize(krb5_context kcontext,krb5_pointer arg,krb5_octet ** buffer,size_t * lenremain)92 krb5_checksum_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
93 {
94 krb5_error_code kret;
95 krb5_checksum *checksum;
96 size_t required;
97 krb5_octet *bp;
98 size_t remain;
99
100 required = 0;
101 bp = *buffer;
102 remain = *lenremain;
103 kret = EINVAL;
104 /* Solaris Kerberos */
105 checksum = (krb5_checksum *) arg;
106 if (checksum) {
107 kret = ENOMEM;
108 if (!krb5_checksum_esize(kcontext, arg, &required) &&
109 (required <= remain)) {
110 /* Our identifier */
111 (void) krb5_ser_pack_int32(KV5M_CHECKSUM, &bp, &remain);
112
113 /* Our checksum_type */
114 (void) krb5_ser_pack_int32((krb5_int32) checksum->checksum_type,
115 &bp, &remain);
116
117 /* Our length */
118 (void) krb5_ser_pack_int32((krb5_int32) checksum->length,
119 &bp, &remain);
120
121 /* Our contents */
122 (void) krb5_ser_pack_bytes(checksum->contents,
123 (size_t) checksum->length,
124 &bp, &remain);
125
126 /* Finally, our trailer */
127 (void) krb5_ser_pack_int32(KV5M_CHECKSUM, &bp, &remain);
128
129 kret = 0;
130 *buffer = bp;
131 *lenremain = remain;
132 }
133 }
134 return(kret);
135 }
136
137 /*
138 * krb5_checksum_internalize() - Internalize the krb5_checksum.
139 */
140 /*ARGSUSED*/
141 static krb5_error_code
krb5_checksum_internalize(krb5_context kcontext,krb5_pointer * argp,krb5_octet ** buffer,size_t * lenremain)142 krb5_checksum_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
143 {
144 krb5_error_code kret;
145 krb5_checksum *checksum;
146 krb5_int32 ibuf;
147 krb5_octet *bp;
148 size_t remain;
149
150 bp = *buffer;
151 remain = *lenremain;
152 kret = EINVAL;
153 /* Read our magic number */
154 if (krb5_ser_unpack_int32(&ibuf, &bp, &remain))
155 ibuf = 0;
156 if (ibuf == KV5M_CHECKSUM) {
157 kret = ENOMEM;
158
159 /* Get a checksum */
160 if ((remain >= (2*sizeof(krb5_int32))) &&
161 (checksum = (krb5_checksum *) MALLOC(sizeof(krb5_checksum)))) {
162 (void) memset(checksum, 0, sizeof(krb5_checksum));
163
164 /* Get the checksum_type */
165 (void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
166 checksum->checksum_type = (krb5_cksumtype) ibuf;
167
168 /* Get the length */
169 (void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
170 checksum->length = (int) ibuf;
171
172 /* Get the string */
173 /* Solaris Kerberos */
174 if (ibuf)
175 checksum->contents = (krb5_octet *)
176 MALLOC((size_t) (ibuf));
177
178 if (!ibuf ||
179 ((checksum->contents) &&
180 !(kret = krb5_ser_unpack_bytes(checksum->contents,
181 (size_t) ibuf,
182 &bp, &remain)))) {
183
184 /* Get the trailer */
185 kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
186 if (!kret && (ibuf == KV5M_CHECKSUM)) {
187 checksum->magic = KV5M_CHECKSUM;
188 *buffer = bp;
189 *lenremain = remain;
190 *argp = (krb5_pointer) checksum;
191 }
192 else
193 kret = EINVAL;
194 }
195 if (kret) {
196 if (checksum->contents)
197 FREE(checksum->contents, checksum->length);
198 FREE(checksum, sizeof (krb5_checksum));
199 }
200 }
201 }
202 return(kret);
203 }
204
205 /*
206 * Register the checksum serializer.
207 */
208 krb5_error_code
krb5_ser_checksum_init(krb5_context kcontext)209 krb5_ser_checksum_init(krb5_context kcontext)
210 {
211 return(krb5_register_serializer(kcontext, &krb5_checksum_ser_entry));
212 }
213