1 /* $NetBSD: keytab_memory.c,v 1.1.1.1 2011/04/13 18:15:34 elric Exp $ */ 2 3 /* 4 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "krb5_locl.h" 37 38 /* memory operations -------------------------------------------- */ 39 40 struct mkt_data { 41 krb5_keytab_entry *entries; 42 int num_entries; 43 char *name; 44 int refcount; 45 struct mkt_data *next; 46 }; 47 48 /* this mutex protects mkt_head, ->refcount, and ->next 49 * content is not protected (name is static and need no protection) 50 */ 51 static HEIMDAL_MUTEX mkt_mutex = HEIMDAL_MUTEX_INITIALIZER; 52 static struct mkt_data *mkt_head; 53 54 55 static krb5_error_code KRB5_CALLCONV 56 mkt_resolve(krb5_context context, const char *name, krb5_keytab id) 57 { 58 struct mkt_data *d; 59 60 HEIMDAL_MUTEX_lock(&mkt_mutex); 61 62 for (d = mkt_head; d != NULL; d = d->next) 63 if (strcmp(d->name, name) == 0) 64 break; 65 if (d) { 66 if (d->refcount < 1) 67 krb5_abortx(context, "Double close on memory keytab, " 68 "refcount < 1 %d", d->refcount); 69 d->refcount++; 70 id->data = d; 71 HEIMDAL_MUTEX_unlock(&mkt_mutex); 72 return 0; 73 } 74 75 d = calloc(1, sizeof(*d)); 76 if(d == NULL) { 77 HEIMDAL_MUTEX_unlock(&mkt_mutex); 78 krb5_set_error_message(context, ENOMEM, 79 N_("malloc: out of memory", "")); 80 return ENOMEM; 81 } 82 d->name = strdup(name); 83 if (d->name == NULL) { 84 HEIMDAL_MUTEX_unlock(&mkt_mutex); 85 free(d); 86 krb5_set_error_message(context, ENOMEM, 87 N_("malloc: out of memory", "")); 88 return ENOMEM; 89 } 90 d->entries = NULL; 91 d->num_entries = 0; 92 d->refcount = 1; 93 d->next = mkt_head; 94 mkt_head = d; 95 HEIMDAL_MUTEX_unlock(&mkt_mutex); 96 id->data = d; 97 return 0; 98 } 99 100 static krb5_error_code KRB5_CALLCONV 101 mkt_close(krb5_context context, krb5_keytab id) 102 { 103 struct mkt_data *d = id->data, **dp; 104 int i; 105 106 HEIMDAL_MUTEX_lock(&mkt_mutex); 107 if (d->refcount < 1) 108 krb5_abortx(context, 109 "krb5 internal error, memory keytab refcount < 1 on close"); 110 111 if (--d->refcount > 0) { 112 HEIMDAL_MUTEX_unlock(&mkt_mutex); 113 return 0; 114 } 115 for (dp = &mkt_head; *dp != NULL; dp = &(*dp)->next) { 116 if (*dp == d) { 117 *dp = d->next; 118 break; 119 } 120 } 121 HEIMDAL_MUTEX_unlock(&mkt_mutex); 122 123 free(d->name); 124 for(i = 0; i < d->num_entries; i++) 125 krb5_kt_free_entry(context, &d->entries[i]); 126 free(d->entries); 127 free(d); 128 return 0; 129 } 130 131 static krb5_error_code KRB5_CALLCONV 132 mkt_get_name(krb5_context context, 133 krb5_keytab id, 134 char *name, 135 size_t namesize) 136 { 137 struct mkt_data *d = id->data; 138 strlcpy(name, d->name, namesize); 139 return 0; 140 } 141 142 static krb5_error_code KRB5_CALLCONV 143 mkt_start_seq_get(krb5_context context, 144 krb5_keytab id, 145 krb5_kt_cursor *c) 146 { 147 /* XXX */ 148 c->fd = 0; 149 return 0; 150 } 151 152 static krb5_error_code KRB5_CALLCONV 153 mkt_next_entry(krb5_context context, 154 krb5_keytab id, 155 krb5_keytab_entry *entry, 156 krb5_kt_cursor *c) 157 { 158 struct mkt_data *d = id->data; 159 if(c->fd >= d->num_entries) 160 return KRB5_KT_END; 161 return krb5_kt_copy_entry_contents(context, &d->entries[c->fd++], entry); 162 } 163 164 static krb5_error_code KRB5_CALLCONV 165 mkt_end_seq_get(krb5_context context, 166 krb5_keytab id, 167 krb5_kt_cursor *cursor) 168 { 169 return 0; 170 } 171 172 static krb5_error_code KRB5_CALLCONV 173 mkt_add_entry(krb5_context context, 174 krb5_keytab id, 175 krb5_keytab_entry *entry) 176 { 177 struct mkt_data *d = id->data; 178 krb5_keytab_entry *tmp; 179 tmp = realloc(d->entries, (d->num_entries + 1) * sizeof(*d->entries)); 180 if(tmp == NULL) { 181 krb5_set_error_message(context, ENOMEM, 182 N_("malloc: out of memory", "")); 183 return ENOMEM; 184 } 185 d->entries = tmp; 186 return krb5_kt_copy_entry_contents(context, entry, 187 &d->entries[d->num_entries++]); 188 } 189 190 static krb5_error_code KRB5_CALLCONV 191 mkt_remove_entry(krb5_context context, 192 krb5_keytab id, 193 krb5_keytab_entry *entry) 194 { 195 struct mkt_data *d = id->data; 196 krb5_keytab_entry *e, *end; 197 int found = 0; 198 199 if (d->num_entries == 0) { 200 krb5_clear_error_message(context); 201 return KRB5_KT_NOTFOUND; 202 } 203 204 /* do this backwards to minimize copying */ 205 for(end = d->entries + d->num_entries, e = end - 1; e >= d->entries; e--) { 206 if(krb5_kt_compare(context, e, entry->principal, 207 entry->vno, entry->keyblock.keytype)) { 208 krb5_kt_free_entry(context, e); 209 memmove(e, e + 1, (end - e - 1) * sizeof(*e)); 210 memset(end - 1, 0, sizeof(*end)); 211 d->num_entries--; 212 end--; 213 found = 1; 214 } 215 } 216 if (!found) { 217 krb5_clear_error_message (context); 218 return KRB5_KT_NOTFOUND; 219 } 220 e = realloc(d->entries, d->num_entries * sizeof(*d->entries)); 221 if(e != NULL || d->num_entries == 0) 222 d->entries = e; 223 return 0; 224 } 225 226 const krb5_kt_ops krb5_mkt_ops = { 227 "MEMORY", 228 mkt_resolve, 229 mkt_get_name, 230 mkt_close, 231 NULL, /* destroy */ 232 NULL, /* get */ 233 mkt_start_seq_get, 234 mkt_next_entry, 235 mkt_end_seq_get, 236 mkt_add_entry, 237 mkt_remove_entry 238 }; 239