1 /*
2 * lib/krb5/krb/ser_adata.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_adata.c - Serialize a krb5_authdata structure.
30 */
31 #include "k5-int.h"
32 #include "int-proto.h"
33
34 /*
35 * Routines to deal with externalizing the krb5_authdata:
36 * krb5_authdata_size();
37 * krb5_authdata_externalize();
38 * krb5_authdata_internalize();
39 */
40 static krb5_error_code krb5_authdata_size
41 (krb5_context, krb5_pointer, size_t *);
42 static krb5_error_code krb5_authdata_externalize
43 (krb5_context, krb5_pointer, krb5_octet **, size_t *);
44 static krb5_error_code krb5_authdata_internalize
45 (krb5_context,krb5_pointer *, krb5_octet **, size_t *);
46
47 /* Local data */
48 static const krb5_ser_entry krb5_authdata_ser_entry = {
49 KV5M_AUTHDATA, /* Type */
50 krb5_authdata_size, /* Sizer routine */
51 krb5_authdata_externalize, /* Externalize routine */
52 krb5_authdata_internalize /* Internalize routine */
53 };
54
55 /*
56 * krb5_authdata_esize() - Determine the size required to externalize
57 * the krb5_authdata.
58 */
59 /*ARGSUSED*/
60 static krb5_error_code
krb5_authdata_size(krb5_context kcontext,krb5_pointer arg,size_t * sizep)61 krb5_authdata_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
62 {
63 krb5_error_code kret;
64 krb5_authdata *authdata;
65
66 /*
67 * krb5_authdata requires:
68 * krb5_int32 for KV5M_AUTHDATA
69 * krb5_int32 for ad_type
70 * krb5_int32 for length
71 * authdata->length for contents
72 * krb5_int32 for KV5M_AUTHDATA
73 */
74 kret = EINVAL;
75 /* Solaris Kerberos */
76 authdata = (krb5_authdata *) arg;
77 if (authdata) {
78 *sizep += (sizeof(krb5_int32) +
79 sizeof(krb5_int32) +
80 sizeof(krb5_int32) +
81 sizeof(krb5_int32) +
82 (size_t) authdata->length);
83 kret = 0;
84 }
85 return(kret);
86 }
87
88 /*
89 * krb5_authdata_externalize() - Externalize the krb5_authdata.
90 */
91 static krb5_error_code
krb5_authdata_externalize(krb5_context kcontext,krb5_pointer arg,krb5_octet ** buffer,size_t * lenremain)92 krb5_authdata_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
93 {
94 krb5_error_code kret;
95 krb5_authdata *authdata;
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 authdata = (krb5_authdata *) arg;
106 if (authdata) {
107 kret = ENOMEM;
108 if (!krb5_authdata_size(kcontext, arg, &required) &&
109 (required <= remain)) {
110 /* Our identifier */
111 (void) krb5_ser_pack_int32(KV5M_AUTHDATA, &bp, &remain);
112
113 /* Our ad_type */
114 (void) krb5_ser_pack_int32((krb5_int32) authdata->ad_type,
115 &bp, &remain);
116
117 /* Our length */
118 (void) krb5_ser_pack_int32((krb5_int32) authdata->length,
119 &bp, &remain);
120
121 /* Our contents */
122 (void) krb5_ser_pack_bytes(authdata->contents,
123 (size_t) authdata->length,
124 &bp, &remain);
125
126 /* Finally, our trailer */
127 (void) krb5_ser_pack_int32(KV5M_AUTHDATA, &bp, &remain);
128 kret = 0;
129 *buffer = bp;
130 *lenremain = remain;
131 }
132 }
133 return(kret);
134 }
135
136 /*
137 * krb5_authdata_internalize() - Internalize the krb5_authdata.
138 */
139 /*ARGSUSED*/
140 static krb5_error_code
krb5_authdata_internalize(krb5_context kcontext,krb5_pointer * argp,krb5_octet ** buffer,size_t * lenremain)141 krb5_authdata_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
142 {
143 krb5_error_code kret;
144 krb5_authdata *authdata;
145 krb5_int32 ibuf;
146 krb5_octet *bp;
147 size_t remain;
148
149 bp = *buffer;
150 remain = *lenremain;
151 kret = EINVAL;
152 /* Read our magic number */
153 if (krb5_ser_unpack_int32(&ibuf, &bp, &remain))
154 ibuf = 0;
155 if (ibuf == KV5M_AUTHDATA) {
156 kret = ENOMEM;
157
158 /* Get a authdata */
159 if ((remain >= (2*sizeof(krb5_int32))) &&
160 (authdata = (krb5_authdata *) MALLOC(sizeof(krb5_authdata)))) {
161 (void) memset(authdata, 0, sizeof(krb5_authdata));
162
163 /* Get the ad_type */
164 (void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
165 authdata->ad_type = (krb5_authdatatype) ibuf;
166
167 /* Get the length */
168 (void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
169 authdata->length = (int) ibuf;
170
171 /* Get the string */
172 /* Solaris Kerberos */
173 authdata->contents = (krb5_octet *)
174 MALLOC((size_t) (ibuf));
175 if ((authdata->contents) &&
176 !(kret = krb5_ser_unpack_bytes(authdata->contents,
177 (size_t) ibuf,
178 &bp, &remain))) {
179 if ((kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain)))
180 ibuf = 0;
181 if (ibuf == KV5M_AUTHDATA) {
182 authdata->magic = KV5M_AUTHDATA;
183 *buffer = bp;
184 *lenremain = remain;
185 *argp = (krb5_pointer) authdata;
186 }
187 else
188 kret = EINVAL;
189 }
190 if (kret) {
191 if (authdata->contents)
192 FREE(authdata->contents, authdata->length);
193 FREE(authdata, sizeof (krb5_authdata));
194 }
195 }
196 }
197 return(kret);
198 }
199
200 /*
201 * Register the authdata serializer.
202 */
203 krb5_error_code
krb5_ser_authdata_init(krb5_context kcontext)204 krb5_ser_authdata_init(krb5_context kcontext)
205 {
206 return(krb5_register_serializer(kcontext, &krb5_authdata_ser_entry));
207 }
208