contrib/bind9/lib/irs/dnsconf.c

   1 /*
   2  * Copyright (C) 2009  Internet Systems Consortium, Inc. ("ISC")
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   9  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  10  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  11  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  12  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  13  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  14  * PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /* $Id: dnsconf.c,v 1.3 2009/09/02 23:48:02 tbox Exp $ */
  18
  19 /*! \file */
  20
  21 #include <config.h>
  22
  23 #include <string.h>
  24
  25 #include <isc/base64.h>
  26 #include <isc/buffer.h>
  27 #include <isc/file.h>
  28 #include <isc/mem.h>
  29 #include <isc/util.h>
  30
  31 #include <isccfg/dnsconf.h>
  32
  33 #include <dns/fixedname.h>
  34 #include <dns/name.h>
  35 #include <dns/rdata.h>
  36 #include <dns/rdatastruct.h>
  37
  38 #include <irs/dnsconf.h>
  39
  40 #define IRS_DNSCONF_MAGIC               ISC_MAGIC('D', 'c', 'f', 'g')
  41 #define IRS_DNSCONF_VALID(c)            ISC_MAGIC_VALID(c, IRS_DNSCONF_MAGIC)
  42
  43 /*!
  44  * configuration data structure
  45  */
  46
  47 struct irs_dnsconf {
  48         unsigned int magic;
  49         isc_mem_t *mctx;
  50         irs_dnsconf_dnskeylist_t trusted_keylist;
  51 };
  52
  53 static isc_result_t
  54 configure_dnsseckeys(irs_dnsconf_t *conf, cfg_obj_t *cfgobj,
  55                      dns_rdataclass_t rdclass)
  56 {
  57         isc_mem_t *mctx = conf->mctx;
  58         const cfg_obj_t *keys = NULL;
  59         const cfg_obj_t *key, *keylist;
  60         dns_fixedname_t fkeyname;
  61         dns_name_t *keyname_base, *keyname;
  62         const cfg_listelt_t *element, *element2;
  63         isc_result_t result;
  64         isc_uint32_t flags, proto, alg;
  65         const char *keystr, *keynamestr;
  66         unsigned char keydata[4096];
  67         isc_buffer_t keydatabuf_base, *keydatabuf;
  68         dns_rdata_dnskey_t keystruct;
  69         unsigned char rrdata[4096];
  70         isc_buffer_t rrdatabuf;
  71         isc_region_t r;
  72         isc_buffer_t namebuf;
  73         irs_dnsconf_dnskey_t *keyent;
  74
  75         cfg_map_get(cfgobj, "trusted-keys", &keys);
  76         if (keys == NULL)
  77                 return (ISC_R_SUCCESS);
  78
  79         for (element = cfg_list_first(keys);
  80              element != NULL;
  81              element = cfg_list_next(element)) {
  82                 keylist = cfg_listelt_value(element);
  83                 for (element2 = cfg_list_first(keylist);
  84                      element2 != NULL;
  85                      element2 = cfg_list_next(element2))
  86                 {
  87                         keydatabuf = NULL;
  88                         keyname = NULL;
  89
  90                         key = cfg_listelt_value(element2);
  91
  92                         flags = cfg_obj_asuint32(cfg_tuple_get(key, "flags"));
  93                         proto = cfg_obj_asuint32(cfg_tuple_get(key,
  94                                                                "protocol"));
  95                         alg = cfg_obj_asuint32(cfg_tuple_get(key,
  96                                                              "algorithm"));
  97                         keynamestr = cfg_obj_asstring(cfg_tuple_get(key,
  98                                                                     "name"));
  99
 100                         keystruct.common.rdclass = rdclass;
 101                         keystruct.common.rdtype = dns_rdatatype_dnskey;
 102                         keystruct.mctx = NULL;
 103                         ISC_LINK_INIT(&keystruct.common, link);
 104
 105                         if (flags > 0xffff)
 106                                 return (ISC_R_RANGE);
 107                         if (proto > 0xff)
 108                                 return (ISC_R_RANGE);
 109                         if (alg > 0xff)
 110                                 return (ISC_R_RANGE);
 111                         keystruct.flags = (isc_uint16_t)flags;
 112                         keystruct.protocol = (isc_uint8_t)proto;
 113                         keystruct.algorithm = (isc_uint8_t)alg;
 114
 115                         isc_buffer_init(&keydatabuf_base, keydata,
 116                                         sizeof(keydata));
 117                         isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
 118
 119                         /* Configure key value */
 120                         keystr = cfg_obj_asstring(cfg_tuple_get(key, "key"));
 121                         result = isc_base64_decodestring(keystr,
 122                                                          &keydatabuf_base);
 123                         if (result != ISC_R_SUCCESS)
 124                                 return (result);
 125                         isc_buffer_usedregion(&keydatabuf_base, &r);
 126                         keystruct.datalen = r.length;
 127                         keystruct.data = r.base;
 128
 129                         result = dns_rdata_fromstruct(NULL,
 130                                                       keystruct.common.rdclass,
 131                                                       keystruct.common.rdtype,
 132                                                       &keystruct, &rrdatabuf);
 133                         if (result != ISC_R_SUCCESS)
 134                                 return (result);
 135                         isc_buffer_usedregion(&rrdatabuf, &r);
 136                         result = isc_buffer_allocate(mctx, &keydatabuf,
 137                                                      r.length);
 138                         if (result != ISC_R_SUCCESS)
 139                                 return (result);
 140                         result = isc_buffer_copyregion(keydatabuf, &r);
 141                         if (result != ISC_R_SUCCESS)
 142                                 goto cleanup;
 143
 144                         /* Configure key name */
 145                         dns_fixedname_init(&fkeyname);
 146                         keyname_base = dns_fixedname_name(&fkeyname);
 147                         isc_buffer_init(&namebuf, keynamestr,
 148                                         strlen(keynamestr));
 149                         isc_buffer_add(&namebuf, strlen(keynamestr));
 150                         result = dns_name_fromtext(keyname_base, &namebuf,
 151                                                    dns_rootname, 0, NULL);
 152                         if (result != ISC_R_SUCCESS)
 153                                 return (result);
 154                         keyname = isc_mem_get(mctx, sizeof(*keyname));
 155                         if (keyname == NULL) {
 156                                 result = ISC_R_NOMEMORY;
 157                                 goto cleanup;
 158                         }
 159                         dns_name_init(keyname, NULL);
 160                         result = dns_name_dup(keyname_base, mctx, keyname);
 161                         if (result != ISC_R_SUCCESS)
 162                                 goto cleanup;
 163
 164                         /* Add the key data to the list */
 165                         keyent = isc_mem_get(mctx, sizeof(*keyent));
 166                         if (keyent == NULL) {
 167                                 dns_name_free(keyname, mctx);
 168                                 result = ISC_R_NOMEMORY;
 169                                 goto cleanup;
 170                         }
 171                         keyent->keyname = keyname;
 172                         keyent->keydatabuf = keydatabuf;
 173
 174                         ISC_LIST_APPEND(conf->trusted_keylist, keyent, link);
 175                 }
 176         }
 177
 178         return (ISC_R_SUCCESS);
 179
 180  cleanup:
 181         if (keydatabuf != NULL)
 182                 isc_buffer_free(&keydatabuf);
 183         if (keyname != NULL)
 184                 isc_mem_put(mctx, keyname, sizeof(*keyname));
 185
 186         return (result);
 187 }
 188
 189 isc_result_t
 190 irs_dnsconf_load(isc_mem_t *mctx, const char *filename, irs_dnsconf_t **confp)
 191 {
 192         irs_dnsconf_t *conf;
 193         cfg_parser_t *parser = NULL;
 194         cfg_obj_t *cfgobj = NULL;
 195         isc_result_t result = ISC_R_SUCCESS;
 196
 197         REQUIRE(confp != NULL && *confp == NULL);
 198
 199         conf = isc_mem_get(mctx, sizeof(*conf));
 200         if (conf == NULL)
 201                 return (ISC_R_NOMEMORY);
 202
 203         conf->mctx = mctx;
 204         ISC_LIST_INIT(conf->trusted_keylist);
 205
 206         /*
 207          * If the specified file does not exist, we'll simply with an empty
 208          * configuration.
 209          */
 210         if (!isc_file_exists(filename))
 211                 goto cleanup;
 212
 213         result = cfg_parser_create(mctx, NULL, &parser);
 214         if (result != ISC_R_SUCCESS)
 215                 goto cleanup;
 216
 217         result = cfg_parse_file(parser, filename, &cfg_type_dnsconf,
 218                                 &cfgobj);
 219         if (result != ISC_R_SUCCESS)
 220                 goto cleanup;
 221
 222         result = configure_dnsseckeys(conf, cfgobj, dns_rdataclass_in);
 223
 224  cleanup:
 225         if (parser != NULL) {
 226                 if (cfgobj != NULL)
 227                         cfg_obj_destroy(parser, &cfgobj);
 228                 cfg_parser_destroy(&parser);
 229         }
 230
 231         conf->magic = IRS_DNSCONF_MAGIC;
 232
 233         if (result == ISC_R_SUCCESS)
 234                 *confp = conf;
 235         else
 236                 irs_dnsconf_destroy(&conf);
 237
 238         return (result);
 239 }
 240
 241 void
 242 irs_dnsconf_destroy(irs_dnsconf_t **confp) {
 243         irs_dnsconf_t *conf;
 244         irs_dnsconf_dnskey_t *keyent;
 245
 246         REQUIRE(confp != NULL);
 247         conf = *confp;
 248         REQUIRE(IRS_DNSCONF_VALID(conf));
 249
 250         while ((keyent = ISC_LIST_HEAD(conf->trusted_keylist)) != NULL) {
 251                 ISC_LIST_UNLINK(conf->trusted_keylist, keyent, link);
 252
 253                 isc_buffer_free(&keyent->keydatabuf);
 254                 dns_name_free(keyent->keyname, conf->mctx);
 255                 isc_mem_put(conf->mctx, keyent->keyname, sizeof(dns_name_t));
 256                 isc_mem_put(conf->mctx, keyent, sizeof(*keyent));
 257         }
 258
 259         isc_mem_put(conf->mctx, conf, sizeof(*conf));
 260
 261         *confp = NULL;
 262 }
 263
 264 irs_dnsconf_dnskeylist_t *
 265 irs_dnsconf_gettrustedkeys(irs_dnsconf_t *conf) {
 266         REQUIRE(IRS_DNSCONF_VALID(conf));
 267
 268         return (&conf->trusted_keylist);
 269 }