lib/hdb/dbinfo.c

   1 /*
   2  * Copyright (c) 2005 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 "hdb_locl.h"
  35
  36 struct hdb_dbinfo {
  37     char *label;
  38     char *realm;
  39     char *dbname;
  40     char *mkey_file;
  41     char *acl_file;
  42     char *log_file;
  43     const krb5_config_binding *binding;
  44     struct hdb_dbinfo *next;
  45 };
  46
  47 static int
  48 get_dbinfo(krb5_context context,
  49            const krb5_config_binding *db_binding,
  50            const char *label,
  51            struct hdb_dbinfo **db)
  52 {
  53     struct hdb_dbinfo *di;
  54     const char *p;
  55
  56     *db = NULL;
  57
  58     p = krb5_config_get_string(context, db_binding, "dbname", NULL);
  59     if(p == NULL)
  60         return 0;
  61
  62     di = calloc(1, sizeof(*di));
  63     if (di == NULL) {
  64         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
  65         return ENOMEM;
  66     }
  67     di->label = strdup(label);
  68     di->dbname = strdup(p);
  69
  70     p = krb5_config_get_string(context, db_binding, "realm", NULL);
  71     if(p)
  72         di->realm = strdup(p);
  73     p = krb5_config_get_string(context, db_binding, "mkey_file", NULL);
  74     if(p)
  75         di->mkey_file = strdup(p);
  76     p = krb5_config_get_string(context, db_binding, "acl_file", NULL);
  77     if(p)
  78         di->acl_file = strdup(p);
  79     p = krb5_config_get_string(context, db_binding, "log_file", NULL);
  80     if(p)
  81         di->log_file = strdup(p);
  82
  83     di->binding = db_binding;
  84
  85     *db = di;
  86     return 0;
  87 }
  88
  89
  90 int
  91 hdb_get_dbinfo(krb5_context context, struct hdb_dbinfo **dbp)
  92 {
  93     const krb5_config_binding *db_binding;
  94     struct hdb_dbinfo *di, **dt, *databases;
  95     const char *default_dbname = HDB_DEFAULT_DB;
  96     const char *default_mkey = HDB_DB_DIR "/m-key";
  97     const char *default_acl = HDB_DB_DIR "/kadmind.acl";
  98     const char *p;
  99     int ret;
 100
 101     *dbp = NULL;
 102     dt = NULL;
 103     databases = NULL;
 104
 105     db_binding = krb5_config_get_list(context, NULL,
 106                                       "kdc",
 107                                       "database",
 108                                       NULL);
 109     if (db_binding) {
 110
 111         ret = get_dbinfo(context, db_binding, "default", &databases);
 112         if (ret == 0 && databases != NULL)
 113             dt = &databases->next;
 114
 115         for ( ; db_binding != NULL; db_binding = db_binding->next) {
 116
 117             if (db_binding->type != krb5_config_list)
 118                 continue;
 119
 120             ret = get_dbinfo(context, db_binding->u.list,
 121                              db_binding->name, &di);
 122             if (ret)
 123                 krb5_err(context, 1, ret, "failed getting realm");
 124
 125             if (di == NULL)
 126                 continue;
 127
 128             if (dt)
 129                 *dt = di;
 130             else {
 131                 hdb_free_dbinfo(context, &databases);
 132                 databases = di;
 133             }
 134             dt = &di->next;
 135
 136         }
 137     }
 138
 139     if (databases == NULL) {
 140         /* if there are none specified, create one and use defaults */
 141         databases = calloc(1, sizeof(*databases));
 142         databases->label = strdup("default");
 143     }
 144
 145     for (di = databases; di; di = di->next) {
 146         if (di->dbname == NULL) {
 147             di->dbname = strdup(default_dbname);
 148             if (di->mkey_file == NULL)
 149                 di->mkey_file = strdup(default_mkey);
 150         }
 151         if (di->mkey_file == NULL) {
 152             p = strrchr(di->dbname, '.');
 153             if(p == NULL || strchr(p, '/') != NULL)
 154                 /* final pathname component does not contain a . */
 155                 ret = asprintf(&di->mkey_file, "%s.mkey", di->dbname);
 156             else
 157                 /* the filename is something.else, replace .else with
 158                    .mkey */
 159                 ret = asprintf(&di->mkey_file, "%.*s.mkey",
 160                                (int)(p - di->dbname), di->dbname);
 161             if (ret == -1) {
 162                 hdb_free_dbinfo(context, &databases);
 163                 return ENOMEM;
 164             }
 165         }
 166         if(di->acl_file == NULL)
 167             di->acl_file = strdup(default_acl);
 168     }
 169     *dbp = databases;
 170     return 0;
 171 }
 172
 173
 174 struct hdb_dbinfo *
 175 hdb_dbinfo_get_next(struct hdb_dbinfo *dbp, struct hdb_dbinfo *dbprevp)
 176 {
 177     if (dbprevp == NULL)
 178         return dbp;
 179     else
 180         return dbprevp->next;
 181 }
 182
 183 const char *
 184 hdb_dbinfo_get_label(krb5_context context, struct hdb_dbinfo *dbp)
 185 {
 186     return dbp->label;
 187 }
 188
 189 const char *
 190 hdb_dbinfo_get_realm(krb5_context context, struct hdb_dbinfo *dbp)
 191 {
 192     return dbp->realm;
 193 }
 194
 195 const char *
 196 hdb_dbinfo_get_dbname(krb5_context context, struct hdb_dbinfo *dbp)
 197 {
 198     return dbp->dbname;
 199 }
 200
 201 const char *
 202 hdb_dbinfo_get_mkey_file(krb5_context context, struct hdb_dbinfo *dbp)
 203 {
 204     return dbp->mkey_file;
 205 }
 206
 207 const char *
 208 hdb_dbinfo_get_acl_file(krb5_context context, struct hdb_dbinfo *dbp)
 209 {
 210     return dbp->acl_file;
 211 }
 212
 213 const char *
 214 hdb_dbinfo_get_log_file(krb5_context context, struct hdb_dbinfo *dbp)
 215 {
 216     return dbp->log_file;
 217 }
 218
 219 const krb5_config_binding *
 220 hdb_dbinfo_get_binding(krb5_context context, struct hdb_dbinfo *dbp)
 221 {
 222     return dbp->binding;
 223 }
 224
 225 void
 226 hdb_free_dbinfo(krb5_context context, struct hdb_dbinfo **dbp)
 227 {
 228     struct hdb_dbinfo *di, *ndi;
 229
 230     for(di = *dbp; di != NULL; di = ndi) {
 231         ndi = di->next;
 232         free (di->label);
 233         free (di->realm);
 234         free (di->dbname);
 235         free (di->mkey_file);
 236         free (di->acl_file);
 237         free (di->log_file);
 238         free(di);
 239     }
 240     *dbp = NULL;
 241 }
 242
 243 /**
 244  * Return the directory where the hdb database resides.
 245  *
 246  * @param context Kerberos 5 context.
 247  *
 248  * @return string pointing to directory.
 249  */
 250
 251 const char *
 252 hdb_db_dir(krb5_context context)
 253 {
 254     const char *p;
 255
 256     p = krb5_config_get_string(context, NULL, "hdb", "db-dir", NULL);
 257     if (p)
 258         return p;
 259
 260     return HDB_DB_DIR;
 261 }
 262
 263 /**
 264  * Return the default hdb database resides.
 265  *
 266  * @param context Kerberos 5 context.
 267  *
 268  * @return string pointing to directory.
 269  */
 270
 271 const char *
 272 hdb_default_db(krb5_context context)
 273 {
 274     static char *default_hdb = NULL;
 275     struct hdb_dbinfo *dbinfo = NULL;
 276     struct hdb_dbinfo *d = NULL;
 277     const char *s;
 278
 279     if (default_hdb)
 280         return default_hdb;
 281
 282     (void) hdb_get_dbinfo(context, &dbinfo);
 283     while ((d = hdb_dbinfo_get_next(dbinfo, d)) != NULL) {
 284         if ((s = hdb_dbinfo_get_dbname(context, d)) &&
 285             (default_hdb = strdup(s)))
 286             break;
 287     }
 288
 289     hdb_free_dbinfo(context, &dbinfo);
 290     return default_hdb ? default_hdb : HDB_DEFAULT_DB;
 291 }