1 /*
2 * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "krb5_locl.h"
35
36 /**
37 * Reset the (potentially uninitalized) krb5_data structure.
38 *
39 * @param p krb5_data to reset.
40 *
41 * @ingroup krb5
42 */
43
44 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_data_zero(krb5_data * p)45 krb5_data_zero(krb5_data *p)
46 {
47 p->length = 0;
48 p->data = NULL;
49 }
50
51 /**
52 * Free the content of krb5_data structure, its ok to free a zeroed
53 * structure (with memset() or krb5_data_zero()). When done, the
54 * structure will be zeroed. The same function is called
55 * krb5_free_data_contents() in MIT Kerberos.
56 *
57 * @param p krb5_data to free.
58 *
59 * @ingroup krb5
60 */
61
62 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_data_free(krb5_data * p)63 krb5_data_free(krb5_data *p)
64 {
65 if(p->data != NULL)
66 free(p->data);
67 krb5_data_zero(p);
68 }
69
70 /**
71 * Free krb5_data (and its content).
72 *
73 * @param context Kerberos 5 context.
74 * @param p krb5_data to free.
75 *
76 * @ingroup krb5
77 */
78
79 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_free_data(krb5_context context,krb5_data * p)80 krb5_free_data(krb5_context context,
81 krb5_data *p)
82 {
83 krb5_data_free(p);
84 free(p);
85 }
86
87 /**
88 * Allocate data of and krb5_data.
89 *
90 * @param p krb5_data to allocate.
91 * @param len size to allocate.
92 *
93 * @return Returns 0 to indicate success. Otherwise an kerberos et
94 * error code is returned.
95 *
96 * @ingroup krb5
97 */
98
99 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_alloc(krb5_data * p,int len)100 krb5_data_alloc(krb5_data *p, int len)
101 {
102 p->data = malloc(len);
103 if(len && p->data == NULL)
104 return ENOMEM;
105 p->length = len;
106 return 0;
107 }
108
109 /**
110 * Grow (or shrink) the content of krb5_data to a new size.
111 *
112 * @param p krb5_data to free.
113 * @param len new size.
114 *
115 * @return Returns 0 to indicate success. Otherwise an kerberos et
116 * error code is returned.
117 *
118 * @ingroup krb5
119 */
120
121 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_realloc(krb5_data * p,int len)122 krb5_data_realloc(krb5_data *p, int len)
123 {
124 void *tmp;
125 tmp = realloc(p->data, len);
126 if(len && !tmp)
127 return ENOMEM;
128 p->data = tmp;
129 p->length = len;
130 return 0;
131 }
132
133 /**
134 * Copy the data of len into the krb5_data.
135 *
136 * @param p krb5_data to copy into.
137 * @param data data to copy..
138 * @param len new size.
139 *
140 * @return Returns 0 to indicate success. Otherwise an kerberos et
141 * error code is returned.
142 *
143 * @ingroup krb5
144 */
145
146 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_data_copy(krb5_data * p,const void * data,size_t len)147 krb5_data_copy(krb5_data *p, const void *data, size_t len)
148 {
149 if (len) {
150 if(krb5_data_alloc(p, len))
151 return ENOMEM;
152 memmove(p->data, data, len);
153 } else
154 p->data = NULL;
155 p->length = len;
156 return 0;
157 }
158
159 /**
160 * Copy the data into a newly allocated krb5_data.
161 *
162 * @param context Kerberos 5 context.
163 * @param indata the krb5_data data to copy
164 * @param outdata new krb5_date to copy too. Free with krb5_free_data().
165 *
166 * @return Returns 0 to indicate success. Otherwise an kerberos et
167 * error code is returned.
168 *
169 * @ingroup krb5
170 */
171
172 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_copy_data(krb5_context context,const krb5_data * indata,krb5_data ** outdata)173 krb5_copy_data(krb5_context context,
174 const krb5_data *indata,
175 krb5_data **outdata)
176 {
177 krb5_error_code ret;
178 ALLOC(*outdata, 1);
179 if(*outdata == NULL) {
180 krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
181 return ENOMEM;
182 }
183 ret = der_copy_octet_string(indata, *outdata);
184 if(ret) {
185 krb5_clear_error_message (context);
186 free(*outdata);
187 *outdata = NULL;
188 }
189 return ret;
190 }
191
192 /**
193 * Compare to data.
194 *
195 * @param data1 krb5_data to compare
196 * @param data2 krb5_data to compare
197 *
198 * @return return the same way as memcmp(), useful when sorting.
199 *
200 * @ingroup krb5
201 */
202
203 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
krb5_data_cmp(const krb5_data * data1,const krb5_data * data2)204 krb5_data_cmp(const krb5_data *data1, const krb5_data *data2)
205 {
206 if (data1->length != data2->length)
207 return data1->length - data2->length;
208 return memcmp(data1->data, data2->data, data1->length);
209 }
210
211 /**
212 * Compare to data not exposing timing information from the checksum data
213 *
214 * @param data1 krb5_data to compare
215 * @param data2 krb5_data to compare
216 *
217 * @return returns zero for same data, otherwise non zero.
218 *
219 * @ingroup krb5
220 */
221
222 KRB5_LIB_FUNCTION int KRB5_LIB_CALL
krb5_data_ct_cmp(const krb5_data * data1,const krb5_data * data2)223 krb5_data_ct_cmp(const krb5_data *data1, const krb5_data *data2)
224 {
225 if (data1->length != data2->length)
226 return data1->length - data2->length;
227 return ct_memcmp(data1->data, data2->data, data1->length);
228 }
229