summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/krb5/keytab_memory.c
blob: 73ffa1c67d7fa3353db83d578397319fe5b4892f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
/*
 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "krb5_locl.h"

/* memory operations -------------------------------------------- */

struct mkt_data {
    krb5_keytab_entry *entries;
    int num_entries;
    char *name;
    int refcount;
    struct mkt_data *next;
};

/* this mutex protects mkt_head, ->refcount, and ->next
 * content is not protected (name is static and need no protection)
 */
static HEIMDAL_MUTEX mkt_mutex = HEIMDAL_MUTEX_INITIALIZER;
static struct mkt_data *mkt_head;


static krb5_error_code
mkt_resolve(krb5_context context, const char *name, krb5_keytab id)
{
    struct mkt_data *d;

    HEIMDAL_MUTEX_lock(&mkt_mutex);

    for (d = mkt_head; d != NULL; d = d->next)
	if (strcmp(d->name, name) == 0)
	    break;
    if (d) {
	if (d->refcount < 1)
	    krb5_abortx(context, "Double close on memory keytab, "
			"refcount < 1 %d", d->refcount);
	d->refcount++;
	id->data = d;
	HEIMDAL_MUTEX_unlock(&mkt_mutex);
	return 0;
    }

    d = calloc(1, sizeof(*d));
    if(d == NULL) {
	HEIMDAL_MUTEX_unlock(&mkt_mutex);
	krb5_set_error_message(context, ENOMEM,
			       N_("malloc: out of memory", ""));
	return ENOMEM;
    }
    d->name = strdup(name);
    if (d->name == NULL) {
	HEIMDAL_MUTEX_unlock(&mkt_mutex);
	free(d);
	krb5_set_error_message(context, ENOMEM,
			       N_("malloc: out of memory", ""));
	return ENOMEM;
    }
    d->entries = NULL;
    d->num_entries = 0;
    d->refcount = 1;
    d->next = mkt_head;
    mkt_head = d;
    HEIMDAL_MUTEX_unlock(&mkt_mutex);
    id->data = d;
    return 0;
}

static krb5_error_code
mkt_close(krb5_context context, krb5_keytab id)
{
    struct mkt_data *d = id->data, **dp;
    int i;

    HEIMDAL_MUTEX_lock(&mkt_mutex);
    if (d->refcount < 1)
	krb5_abortx(context,
		    "krb5 internal error, memory keytab refcount < 1 on close");

    if (--d->refcount > 0) {
	HEIMDAL_MUTEX_unlock(&mkt_mutex);
	return 0;
    }
    for (dp = &mkt_head; *dp != NULL; dp = &(*dp)->next) {
	if (*dp == d) {
	    *dp = d->next;
	    break;
	}
    }
    HEIMDAL_MUTEX_unlock(&mkt_mutex);

    free(d->name);
    for(i = 0; i < d->num_entries; i++)
	krb5_kt_free_entry(context, &d->entries[i]);
    free(d->entries);
    free(d);
    return 0;
}

static krb5_error_code
mkt_get_name(krb5_context context,
	     krb5_keytab id,
	     char *name,
	     size_t namesize)
{
    struct mkt_data *d = id->data;
    strlcpy(name, d->name, namesize);
    return 0;
}

static krb5_error_code
mkt_start_seq_get(krb5_context context,
		  krb5_keytab id,
		  krb5_kt_cursor *c)
{
    /* XXX */
    c->fd = 0;
    return 0;
}

static krb5_error_code
mkt_next_entry(krb5_context context,
	       krb5_keytab id,
	       krb5_keytab_entry *entry,
	       krb5_kt_cursor *c)
{
    struct mkt_data *d = id->data;
    if(c->fd >= d->num_entries)
	return KRB5_KT_END;
    return krb5_kt_copy_entry_contents(context, &d->entries[c->fd++], entry);
}

static krb5_error_code
mkt_end_seq_get(krb5_context context,
		krb5_keytab id,
		krb5_kt_cursor *cursor)
{
    return 0;
}

static krb5_error_code
mkt_add_entry(krb5_context context,
	      krb5_keytab id,
	      krb5_keytab_entry *entry)
{
    struct mkt_data *d = id->data;
    krb5_keytab_entry *tmp;
    tmp = realloc(d->entries, (d->num_entries + 1) * sizeof(*d->entries));
    if(tmp == NULL) {
	krb5_set_error_message(context, ENOMEM,
			       N_("malloc: out of memory", ""));
	return ENOMEM;
    }
    d->entries = tmp;
    return krb5_kt_copy_entry_contents(context, entry,
				       &d->entries[d->num_entries++]);
}

static krb5_error_code
mkt_remove_entry(krb5_context context,
		 krb5_keytab id,
		 krb5_keytab_entry *entry)
{
    struct mkt_data *d = id->data;
    krb5_keytab_entry *e, *end;
    int found = 0;

    if (d->num_entries == 0) {
	krb5_clear_error_message(context);
        return KRB5_KT_NOTFOUND;
    }

    /* do this backwards to minimize copying */
    for(end = d->entries + d->num_entries, e = end - 1; e >= d->entries; e--) {
	if(krb5_kt_compare(context, e, entry->principal,
			   entry->vno, entry->keyblock.keytype)) {
	    krb5_kt_free_entry(context, e);
	    memmove(e, e + 1, (end - e - 1) * sizeof(*e));
	    memset(end - 1, 0, sizeof(*end));
	    d->num_entries--;
	    end--;
	    found = 1;
	}
    }
    if (!found) {
	krb5_clear_error_message (context);
	return KRB5_KT_NOTFOUND;
    }
    e = realloc(d->entries, d->num_entries * sizeof(*d->entries));
    if(e != NULL || d->num_entries == 0)
	d->entries = e;
    return 0;
}

const krb5_kt_ops krb5_mkt_ops = {
    "MEMORY",
    mkt_resolve,
    mkt_get_name,
    mkt_close,
    NULL, /* destroy */
    NULL, /* get */
    mkt_start_seq_get,
    mkt_next_entry,
    mkt_end_seq_get,
    mkt_add_entry,
    mkt_remove_entry
};