external/bsd/bind/dist/contrib/zkt/rollover.c

   1 /*      $NetBSD$        */
   2
   3 /*****************************************************************
   4 **
   5 **      @(#) rollover.c -- The key rollover functions
   6 **
   7 **      Copyright (c) Jan 2005 - May 2008, Holger Zuleger HZnet. All rights reserved.
   8 **
   9 **      This software is open source.
  10 **
  11 **      Redistribution and use in source and binary forms, with or without
  12 **      modification, are permitted provided that the following conditions
  13 **      are met:
  14 **
  15 **      Redistributions of source code must retain the above copyright notice,
  16 **      this list of conditions and the following disclaimer.
  17 **
  18 **      Redistributions in binary form must reproduce the above copyright notice,
  19 **      this list of conditions and the following disclaimer in the documentation
  20 **      and/or other materials provided with the distribution.
  21 **
  22 **      Neither the name of Holger Zuleger HZnet nor the names of its contributors may
  23 **      be used to endorse or promote products derived from this software without
  24 **      specific prior written permission.
  25 **
  26 **      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  27 **      "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  28 **      TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29 **      PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
  30 **      LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31 **      CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32 **      SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33 **      INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34 **      CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35 **      ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36 **      POSSIBILITY OF SUCH DAMAGE.
  37 **
  38 *****************************************************************/
  39 # include <stdio.h>
  40 # include <string.h>
  41 # include <stdlib.h>
  42 # include <ctype.h>
  43 # include <time.h>
  44 # include <assert.h>
  45 # include <dirent.h>
  46 # include <errno.h>
  47 # include <unistd.h>
  48 #ifdef HAVE_CONFIG_H
  49 # include <config.h>
  50 #endif
  51 # include "config_zkt.h"
  52 # include "zconf.h"
  53 # include "debug.h"
  54
  55 # include "misc.h"
  56 # include "zone.h"
  57 # include "dki.h"
  58 # include "log.h"
  59 #define extern
  60 # include "rollover.h"
  61 #undef extern
  62
  63 /*****************************************************************
  64 **      local function definition
  65 *****************************************************************/
  66
  67 static  dki_t   *genkey (dki_t **listp, const char *dir, const char *domain, int ksk, const zconf_t *conf, int status)
  68 {
  69         dki_t   *dkp;
  70
  71         if ( listp == NULL || domain == NULL )
  72                 return NULL;
  73
  74         if ( ksk )
  75                 dkp = dki_new (dir, domain, DKI_KSK, conf->k_algo, conf->k_bits, conf->k_random, conf->k_life / DAYSEC);
  76         else
  77                 dkp = dki_new (dir, domain, DKI_ZSK, conf->k_algo, conf->z_bits, conf->z_random, conf->z_life / DAYSEC);
  78         dki_add (listp, dkp);
  79         dki_setstatus (dkp, status);
  80
  81         return dkp;
  82 }
  83
  84 static  dki_t   *genkey2 (dki_t **listp, const char *dir, const char *domain, int ksk, const zconf_t *conf, int status)
  85 {
  86         dki_t   *dkp;
  87
  88         if ( listp == NULL || domain == NULL )
  89                 return NULL;
  90
  91         if ( ksk )
  92                 dkp = dki_new (dir, domain, DKI_KSK, conf->k2_algo, conf->k_bits, conf->k_random, conf->k_life / DAYSEC);
  93         else
  94                 dkp = dki_new (dir, domain, DKI_ZSK, conf->k2_algo, conf->z_bits, conf->z_random, conf->z_life / DAYSEC);
  95         dki_add (listp, dkp);
  96         dki_setstatus (dkp, status);
  97
  98         return dkp;
  99 }
 100
 101 static  time_t  get_exptime (dki_t *key, const zconf_t *z)
 102 {
 103         time_t  exptime;
 104
 105         exptime = dki_exptime (key);
 106         if ( exptime == 0L )
 107         {
 108                 if ( dki_lifetime (key) )
 109                         exptime = dki_time (key) + dki_lifetime (key);
 110                 else
 111                         exptime = dki_time (key) + z->k_life;
 112         }
 113
 114         return exptime;
 115 }
 116
 117 /*****************************************************************
 118 **      is_parentdirsigned (name)
 119 **      Check if the parent directory of the zone specified by zp
 120 **      is a directory with a signed zone
 121 **      Returns 0 | 1
 122 *****************************************************************/
 123 static  int     is_parentdirsigned (const zone_t *zonelist, const zone_t *zp)
 124 {
 125         char    path[MAX_PATHSIZE+1];
 126         const   char    *ext;
 127 #if 0
 128         const   zconf_t *conf;
 129
 130         /* check if there is a local config file to get the name of the zone file */
 131         snprintf (path, sizeof (path), "%s/../%s", zp->dir, LOCALCONF_FILE);
 132         if ( fileexist (path) )         /* parent dir has local config file ? */
 133                 conf = loadconfig (path, NULL);
 134         else
 135                 conf = zp->conf;
 136
 137         /* build the path of the .signed zone file */
 138         snprintf (path, sizeof (path), "%s/../%s.signed", conf->dir, conf->zonefile);
 139         if ( conf != zp->conf ) /* if we read in a local config file.. */
 140                 free (conf);    /* ..free the memory used */
 141
 142 #else
 143         /* currently we use the signed zone file name of the
 144          * current directory for checking if the file exist.
 145          * TODO: Instead we have to use the name of the zone file
 146          * used in the parent dir (see above)
 147          */
 148
 149         ext = strrchr (zp->sfile, '.');
 150         if ( ext && strcmp (zp->sfile, ".dsigned") == 0 )       /* is the current zone a dynamic one ? */
 151                 /* hack: we are using the standard zone file name for a static zone here */
 152                 snprintf (path, sizeof (path), "%s/../%s", zp->dir, "zone.db.signed");
 153         else
 154         {
 155 # if 1
 156                 const   zone_t  *parent;
 157                 const   char    *parentname;
 158
 159                 /* find out name of parent */
 160                 parentname = strchr (zp->zone, '.');    /* find first dot in zone name */
 161                 if ( parentname == NULL )       /* no parent found! */
 162                         return 0;
 163                 parentname += 1;        /* skip '.' */
 164
 165                 /* try to find parent zone in zonelist */
 166                 if ( (parent = zone_search (zonelist, parentname)) == NULL )
 167                         return 0;
 168                 snprintf (path, sizeof (path), "%s/%s", parent->dir, parent->sfile);
 169 # else
 170                 snprintf (path, sizeof (path), "%s/../%s", zp->dir, zp->sfile);
 171 # endif
 172         }
 173 #endif
 174 lg_mesg (LG_DEBUG, "%s: is_parentdirsigned = %d fileexist (%s)\n", zp->zone, fileexist (path), path);
 175         return fileexist (path);        /* parent dir has zone.db.signed file ? */
 176 }
 177
 178 /*****************************************************************
 179 **      create_parent_file ()
 180 *****************************************************************/
 181 static  int     create_parent_file (const char *fname, int phase, int ttl, const dki_t *dkp)
 182 {
 183         FILE    *fp;
 184
 185         assert ( fname != NULL );
 186
 187         if ( dkp == NULL || (phase != 1 && phase != 2) )
 188                 return 0;
 189
 190         if ( (fp = fopen (fname, "w")) == NULL )
 191                 fatal ("can\'t create new parentfile \"%s\"\n", fname);
 192
 193         if ( phase == 1 )
 194                 fprintf (fp, "; KSK rollover phase1 (new key generated but this is alread the old one)\n");
 195         else
 196                 fprintf (fp, "; KSK rollover phase2 (this is the new key)\n");
 197
 198         dki_prt_dnskeyttl (dkp, fp, ttl);
 199         fclose (fp);
 200
 201         return phase;
 202 }
 203
 204 /*****************************************************************
 205 **      get_parent_phase ()
 206 *****************************************************************/
 207 static  int     get_parent_phase (const char *file)
 208 {
 209         FILE    *fp;
 210         int     phase;
 211
 212         if ( (fp = fopen (file, "r")) == NULL )
 213                 return -1;
 214
 215         phase = 0;
 216         if ( fscanf (fp, "; KSK rollover phase%d", &phase) != 1 )
 217                 phase = 0;
 218
 219         fclose (fp);
 220         return phase;
 221 }
 222
 223 /*****************************************************************
 224 **      kskrollover ()
 225 *****************************************************************/
 226 static  int     kskrollover (dki_t *ksk, zone_t *zonelist, zone_t *zp)
 227 {
 228         char    path[MAX_PATHSIZE+1];
 229         const   zconf_t *z;
 230         time_t  lifetime;
 231         time_t  currtime;
 232         time_t  age;
 233         int     currphase;
 234         int     parfile_age;
 235         int     parent_propagation;
 236         int     parent_resign;
 237         int     parent_keyttl;
 238
 239
 240         assert ( ksk != NULL );
 241         assert ( zp != NULL );
 242
 243         z = zp->conf;
 244         /* check ksk lifetime */
 245         if ( (lifetime = dki_lifetime (ksk)) == 0 )     /* if lifetime of key is not set.. */
 246                 lifetime = z->k_life;                   /* ..use global configured lifetime */
 247
 248         currtime = time (NULL);
 249         age = dki_age (ksk, currtime);
 250
 251         /* build path of parent-file */
 252         pathname (path, sizeof (path), zp->dir, "parent-", zp->zone);
 253
 254         /* check if we have to change the ksk ? */
 255         if ( lifetime > 0 && age > lifetime && !fileexist (path) )      /* lifetime is over and no kskrollover in progress */
 256         {
 257                 /* we are in hierachical mode and the parent directory contains a signed zone ? */
 258                 if ( z->keysetdir && strcmp (z->keysetdir, "..") == 0 && is_parentdirsigned (zonelist, zp) )
 259                 {
 260                         verbmesg (2, z, "\t\tkskrollover: create new key signing key\n");
 261                         /* create a new key: this is phase one of a double signing key rollover */
 262                         ksk = genkey (&zp->keys, zp->dir, zp->zone, DKI_KSK, z, DKI_ACTIVE);
 263                         if ( ksk == NULL )
 264                         {
 265                                 lg_mesg (LG_ERROR, "\"%s\": unable to generate new ksk for double signing rollover", zp->zone);
 266                                 return 0;
 267                         }
 268                         lg_mesg (LG_INFO, "\"%s\": kskrollover phase1: New key %d generated", zp->zone, ksk->tag);
 269
 270                         /* find the oldest active ksk to create the parent file */
 271                         if ( (ksk = (dki_t *)dki_findalgo (zp->keys, DKI_KSK, zp->conf->k_algo, 'a', 1)) == NULL )
 272                                 lg_mesg (LG_ERROR, "kskrollover phase1: Couldn't find the old active key\n");
 273                         if ( !create_parent_file (path, 1, z->key_ttl, ksk) )
 274                                 lg_mesg (LG_ERROR, "Couldn't create parentfile %s\n", path);
 275
 276                 }
 277                 else    /* print out a warning only */
 278                 {
 279                         logmesg ("\t\tWarning: Lifetime of Key Signing Key %d exceeded: %s\n",
 280                                                         ksk->tag, str_delspace (age2str (age)));
 281                         lg_mesg (LG_WARNING, "\"%s\": lifetime of key signing key %d exceeded since %s",
 282                                                         zp->zone, ksk->tag, str_delspace (age2str (age - lifetime)));
 283                 }
 284                 return 1;
 285         }
 286
 287         /* now check if there is an ongoing key rollover */
 288
 289         /* check if parent-file already exist */
 290         if ( !fileexist (path) )        /* no parent-<zone> file found ? */
 291                 return 0;       /* ok, that's it */
 292
 293         /* check the ksk rollover phase we are in */
 294         currphase = get_parent_phase (path);    /* this is the actual state we are in */
 295         parfile_age = file_age (path);
 296
 297         /* TODO: Set these values to the one found in the parent dnssec.conf file */
 298         parent_propagation = PARENT_PROPAGATION;
 299         parent_resign = z->resign;
 300         parent_keyttl = z->key_ttl;
 301
 302         switch ( currphase )
 303         {
 304         case 1: /* we are currently in state one (new ksk already generated) */
 305                 if ( parfile_age > z->proptime + z->key_ttl )   /* can we go to phase 2 ? */
 306                 {
 307                         verbmesg (2, z, "\t\tkskrollover: save new ksk in parent file\n");
 308                         ksk = ksk->next;    /* set ksk to new ksk */
 309                         if ( !create_parent_file (path, currphase+1, z->key_ttl, ksk) )
 310                                 lg_mesg (LG_ERROR, "Couldn't create parentfile %s\n", path);
 311                         lg_mesg (LG_INFO, "\"%s\": kskrollover phase2: send new key %d to the parent zone", zp->zone, ksk->tag);
 312                         return 1;
 313                 }
 314                 else
 315                         verbmesg (2, z, "\t\tkskrollover: we are in state 1 and waiting for propagation of the new key (parentfile %dsec < prop %dsec + keyttl %dsec\n", parfile_age, z->proptime, z->key_ttl);
 316                 break;
 317         case 2: /* we are currently in state two (propagation of new key to the parent) */
 318 #if 0
 319                 if ( parfile_age >= parent_propagation + parent_resign + parent_keyttl )        /* can we go to phase 3 ? */
 320 #else
 321                 if ( parfile_age >= parent_propagation + parent_keyttl )        /* can we go to phase 3 ? */
 322 #endif
 323                 {
 324                         /* remove the parentfile */
 325                         unlink (path);
 326
 327                         /* remove oldest key from list and mark file as removed */
 328                         zp->keys = dki_remove (ksk);
 329
 330                         // verbmesg (2, z, "kskrollover: remove parentfile and rename old key to k<zone>+<algo>+<tag>.key\n");
 331                         verbmesg (2, z, "\t\tkskrollover: remove parentfile and rename old key to k%s+%03d+%05d.key\n",
 332                                                                         ksk->name, ksk->algo, ksk->tag);
 333                         lg_mesg (LG_INFO, "\"%s\": kskrollover phase3: Remove old key %d", zp->zone, ksk->tag);
 334                         return 1;
 335                 }
 336                 else
 337 #if 0
 338                         verbmesg (2, z, "\t\tkskrollover: we are in state 2 and  waiting for parent propagation (parentfile %d < parentprop %d + parentresig %d + parentkeyttl %d\n", parfile_age, parent_propagation, parent_resign, parent_keyttl);
 339 #else
 340                         verbmesg (2, z, "\t\tkskrollover: we are in state 2 and  waiting for parent propagation (parentfile %dsec < parentprop %dsec + parentkeyttl %dsec\n", parfile_age, parent_propagation, parent_keyttl);
 341 #endif
 342                 break;
 343         default:
 344                 assert ( currphase == 1 || currphase == 2 );
 345                 /* NOTREACHED */
 346         }
 347
 348         return 0;
 349 }
 350
 351 /*****************************************************************
 352 **      global function definition
 353 *****************************************************************/
 354
 355 /*****************************************************************
 356 **      ksk5011status ()
 357 **      Check if the list of zone keys containing a revoked or a
 358 **      standby key.
 359 **      Remove the revoked key if it is older than 30 days.
 360 **      If the lifetime of the active key is reached, do a rfc5011
 361 **      keyrollover.
 362 **      Returns an int with the rightmost bit set if a resigning
 363 **      is required. The second rightmost bit is set, if it is an
 364 **      rfc5011 zone.
 365 *****************************************************************/
 366 int     ksk5011status (dki_t **listp, const char *dir, const char *domain, const zconf_t *z)
 367 {
 368         dki_t   *standbykey;
 369         dki_t   *activekey;
 370         dki_t   *dkp;
 371         dki_t   *prev;
 372         time_t  currtime;
 373         time_t  exptime;
 374         int     ret;
 375
 376         assert ( listp != NULL );
 377         assert ( z != NULL );
 378
 379         if ( z->k_life == 0 )
 380                 return 0;
 381
 382         verbmesg (1, z, "\tCheck RFC5011 status\n");
 383
 384         ret = 0;
 385         currtime = time (NULL);
 386
 387         /* go through the list of key signing keys,     */
 388         /* remove revoked keys and set a pointer to standby and active key */
 389         standbykey = activekey = NULL;
 390         prev = NULL;
 391         for ( dkp = *listp; dkp && dki_isksk (dkp); dkp = dkp->next )
 392         {
 393                 exptime = get_exptime (dkp, z);
 394                 if ( dki_isrevoked (dkp) )
 395                         lg_mesg (LG_DEBUG, "zone \"%s\": found revoked key (id=%d exptime=%s); waiting for remove hold down time",
 396                                                         domain, dkp->tag, time2str (exptime, 's'));
 397
 398                 /* revoked key is older than 30 days? */
 399                 if ( dki_isrevoked (dkp) && currtime > exptime + REMOVE_HOLD_DOWN )
 400                 {
 401                         verbmesg (1, z, "\tRemove revoked key %d which is older than 30 days\n", dkp->tag);
 402                         lg_mesg (LG_NOTICE, "zone \"%s\": removing revoked key %d", domain, dkp->tag);
 403
 404                         /* remove key from list and mark file as removed */
 405                         if ( prev == NULL )             /* at the beginning of the list ? */
 406                                 *listp = dki_remove (dkp);
 407                         else                            /* anywhere in the middle of the list */
 408                                 prev->next = dki_remove (dkp);
 409
 410                         ret |= 01;              /* from now on a resigning is necessary */
 411                 }
 412
 413                 /* remember oldest standby and active key */
 414                 if ( dki_status (dkp) == DKI_PUBLISHED )
 415                         standbykey = dkp;
 416                 if ( dki_status (dkp) == DKI_ACTIVE )
 417                         activekey = dkp;
 418         }
 419                                 /* no activekey or no standby key and also no revoked key found ? */
 420         if ( activekey == NULL || (standbykey == NULL && ret == 0) )
 421                 return ret;                             /* Seems that this is a non rfc5011 zone! */
 422
 423         ret |= 02;              /* Zone looks like a rfc5011 zone */
 424
 425         exptime = get_exptime (activekey, z);
 426 #if 0
 427         lg_mesg (LG_DEBUG, "Act Exptime: %s", time2str (exptime, 's'));
 428         lg_mesg (LG_DEBUG, "Stb time: %s", time2str (dki_time (standbykey), 's'));
 429         lg_mesg (LG_DEBUG, "Stb time+wait: %s", time2str (dki_time (standbykey) + min (DAYSEC * 30, z->key_ttl), 's'));
 430 #endif
 431         /* At the first time we introduce a standby key, the lifetime of the current KSK shouldn't be expired, */
 432         /* otherwise we run into an (nearly) immediate key rollover!    */
 433         if ( currtime > exptime && currtime > dki_time (standbykey) + min (ADD_HOLD_DOWN, z->key_ttl) )
 434         {
 435                 lg_mesg (LG_NOTICE, "\"%s\": starting rfc5011 rollover", domain);
 436                 verbmesg (1, z, "\tLifetime of Key Signing Key %d exceeded (%s): Starting rfc5011 rollover!\n",
 437                                                         activekey->tag, str_delspace (age2str (dki_age (activekey, currtime))));
 438                 verbmesg (2, z, "\t\t=>Generating new standby key signing key\n");
 439                 dkp = genkey (listp, dir, domain, DKI_KSK, z, DKI_PUBLISHED);   /* gentime == now; lifetime = z->k_life; exp = 0 */
 440                 if ( !dkp )
 441                 {
 442                         error ("\tcould not generate new standby KSK\n");
 443                         lg_mesg (LG_ERROR, "\%s\": can't generate new standby KSK", domain);
 444                 }
 445                 else
 446                         lg_mesg (LG_NOTICE, "\"%s\": generated new standby KSK %d", domain, dkp->tag);
 447
 448                 /* standby key gets active  */
 449                 verbmesg (2, z, "\t\t=>Activating old standby key %d \n", standbykey->tag);
 450                 dki_setstatus (standbykey, DKI_ACT);
 451
 452                 /* active key should be revoked */
 453                 verbmesg (2, z, "\t\t=>Revoking old active key %d \n", activekey->tag);
 454                 dki_setstatus (activekey, DKI_REVOKED);
 455                 dki_setexptime (activekey, currtime);   /* now the key is expired */
 456
 457                 ret |= 01;              /* resigning necessary */
 458         }
 459
 460         return ret;
 461 }
 462
 463 /*****************************************************************
 464 **      kskstatus ()
 465 **      Check the ksk status of a zone if a ksk lifetime is set.
 466 **      If there is no key signing key present create a new one.
 467 **      Prints out a warning message if the lifetime of the current
 468 **      key signing key is over.
 469 **      Returns 1 if a resigning of the zone is necessary, otherwise
 470 **      the function returns 0.
 471 *****************************************************************/
 472 int     kskstatus (zone_t *zonelist, zone_t *zp)
 473 {
 474         dki_t   *akey;
 475         const   zconf_t *z;
 476
 477         assert ( zp != NULL );
 478
 479         z = zp->conf;
 480         if ( z->k_life == 0 )
 481                 return 0;
 482
 483         verbmesg (1, z, "\tCheck KSK status\n");
 484         /* check if a key signing key exist ? */
 485         akey = (dki_t *)dki_findalgo (zp->keys, DKI_KSK, z->k_algo, 'a', 1);
 486         if ( akey == NULL )
 487         {
 488                 verbmesg (1, z, "\tNo active KSK found: generate new one\n");
 489                 akey = genkey (&zp->keys, zp->dir, zp->zone, DKI_KSK, z, DKI_ACTIVE);
 490                 if ( !akey )
 491                 {
 492                         error ("\tcould not generate new KSK\n");
 493                         lg_mesg (LG_ERROR, "\"%s\": can't generate new KSK: \"%s\"",
 494                                                                 zp->zone, dki_geterrstr());
 495                 }
 496                 else
 497                         lg_mesg (LG_INFO, "\"%s\": generated new KSK %d", zp->zone, akey->tag);
 498                 return akey != NULL;    /* return value of 1 forces a resigning of the zone */
 499         }
 500         else    /* try to start a full automated ksk rollover */
 501                 kskrollover (akey, zonelist, zp);
 502
 503         /* is a second algorithm requested ? (since 0.99) */
 504         if ( z->k2_algo && z->k2_algo != z->k_algo )
 505         {
 506                 /* check for ksk supporting the additional algorithm */
 507                 akey = (dki_t *)dki_findalgo (zp->keys, DKI_KSK, z->k2_algo, 'a', 1);
 508                 if ( akey == NULL )
 509                 {
 510                         verbmesg (1, z, "\tNo active KSK for second algorithm found: generate new one\n");
 511                         akey = genkey2 (&zp->keys, zp->dir, zp->zone, DKI_KSK, z, DKI_ACTIVE);
 512                         if ( !akey )
 513                         {
 514                                 error ("\tcould not generate new KSK for 2nd algorithm\n");
 515                                 lg_mesg (LG_ERROR, "\"%s\": can't generate new KSK for 2nd algorithm: \"%s\"",
 516                                                                         zp->zone, dki_geterrstr());
 517                         }
 518                         else
 519                                 lg_mesg (LG_INFO, "\"%s\": generated new KSK %d for 2nd algorithm",
 520                                                                                 zp->zone, akey->tag);
 521                         return 1;       /* return value of 1 forces a resigning of the zone */
 522                 }
 523         }
 524
 525         return 0;
 526 }
 527
 528 /*****************************************************************
 529 **      zskstatus ()
 530 **      Check the zsk status of a zone.
 531 **      Returns 1 if a resigning of the zone is necessary, otherwise
 532 **      the function returns 0.
 533 *****************************************************************/
 534 int     zskstatus (dki_t **listp, const char *dir, const char *domain, const zconf_t *z)
 535 {
 536         dki_t   *akey;
 537         dki_t   *nextkey;
 538         dki_t   *dkp, *last;
 539         int     keychange;
 540         time_t  lifetime;
 541         time_t  age;
 542         time_t  currtime;
 543
 544         assert ( listp != NULL );
 545         /* dir can be NULL */
 546         assert ( domain != NULL );
 547         assert ( z != NULL );
 548
 549         currtime = time (NULL);
 550
 551         verbmesg (1, z, "\tCheck ZSK status\n");
 552         dbg_val("zskstatus for %s \n", domain);
 553         keychange = 0;
 554         /* Is the depreciated key expired ? */
 555         /* As mentioned by olaf, this is the max_ttl of all the rr in the zone */
 556         lifetime = z->max_ttl + z->proptime;    /* draft kolkman/gieben */
 557         last = NULL;
 558         dkp = *listp;
 559         while ( dkp )
 560                 if ( !dki_isksk (dkp) &&
 561                      dki_status (dkp) == DKI_DEPRECIATED &&
 562                      dki_age (dkp, currtime) > lifetime )
 563                 {
 564                         keychange = 1;
 565                         verbmesg (1, z, "\tLifetime(%d sec) of depreciated key %d exceeded (%d sec)\n",
 566                                          lifetime, dkp->tag, dki_age (dkp, currtime));
 567                         lg_mesg (LG_INFO, "\"%s\": old ZSK %d removed", domain, dkp->tag);
 568                         dkp = dki_destroy (dkp);        /* delete the keyfiles */
 569                         dbg_msg("zskstatus: depreciated key removed ");
 570                         if ( last )
 571                                 last->next = dkp;
 572                         else
 573                                 *listp = dkp;
 574                         verbmesg (1, z, "\t\t->remove it\n");
 575                 }
 576                 else
 577                 {
 578                         last = dkp;
 579                         dkp = dkp->next;
 580                 }
 581
 582         /* check status of active key */
 583         dbg_msg("zskstatus check status of active key ");
 584         lifetime = z->z_life;                   /* global configured lifetime for zsk */
 585         akey = (dki_t *)dki_findalgo (*listp, DKI_ZSK, z->k_algo, 'a', 1);
 586         if ( akey == NULL && lifetime > 0 )     /* no active key found */
 587         {
 588                 verbmesg (1, z, "\tNo active ZSK found: generate new one\n");
 589                 akey = genkey (listp, dir, domain, DKI_ZSK, z, DKI_ACTIVE);
 590                 lg_mesg (LG_INFO, "\"%s\": generated new ZSK %d", domain, akey->tag);
 591         }
 592         else    /* active key exist */
 593         {
 594                 if ( dki_lifetime (akey) )
 595                         lifetime = dki_lifetime (akey); /* set lifetime to lt of active key */
 596
 597                 /* lifetime of active key is expired and published key exist ? */
 598                 age = dki_age (akey, currtime);
 599                 if ( lifetime > 0 && age > lifetime - (OFFSET) )
 600                 {
 601                         verbmesg (1, z, "\tLifetime(%d +/-%d sec) of active key %d exceeded (%d sec)\n",
 602                                         lifetime, (OFFSET) , akey->tag, dki_age (akey, currtime) );
 603
 604                         /* depreciate the key only if there is another active or published key */
 605                         if ( (nextkey = (dki_t *)dki_findalgo (*listp, DKI_ZSK, z->k_algo, 'a', 2)) == NULL ||
 606                               nextkey == akey )
 607                                 nextkey = (dki_t *)dki_findalgo (*listp, DKI_ZSK, z->k_algo, 'p', 1);
 608
 609                         /* Is the published key sufficient long in the zone ? */
 610                         /* As mentioned by Olaf, this should be the ttl of the DNSKEY RR ! */
 611                         if ( nextkey && dki_age (nextkey, currtime) > z->key_ttl + z->proptime )
 612                         {
 613                                 keychange = 1;
 614                                 verbmesg (1, z, "\t\t->depreciate it\n");
 615                                 dki_setstatus (akey, 'd');      /* depreciate the active key */
 616                                 verbmesg (1, z, "\t\t->activate published key %d\n", nextkey->tag);
 617                                 dki_setstatus (nextkey, 'a');   /* activate published key */
 618                                 lg_mesg (LG_NOTICE, "\"%s\": lifetime of zone signing key %d exceeded: ZSK rollover done", domain, akey->tag);
 619                                 akey = nextkey;
 620                                 nextkey = NULL;
 621                                 lifetime = dki_lifetime (akey); /* set lifetime to lt of the new active key (F. Behrens) */
 622                         }
 623                         else
 624                         {
 625                                 verbmesg (1, z, "\t\t->waiting for published key\n");
 626                                 lg_mesg (LG_NOTICE, "\"%s\": lifetime of zone signing key %d exceeded since %s: ZSK rollover deferred: waiting for published key",
 627                                                 domain, akey->tag, str_delspace (age2str (age - lifetime)));
 628                         }
 629                 }
 630         }
 631         /* Should we add a new publish key?  This is necessary if the active
 632          * key will be expired at the next re-signing interval (The published
 633          * time will be checked just before the active key will be removed.
 634          * See above).
 635          */
 636         nextkey = (dki_t *)dki_findalgo (*listp, DKI_ZSK, z->k_algo, 'p', 1);
 637         if ( nextkey == NULL && lifetime > 0 && (akey == NULL ||
 638              dki_age (akey, currtime + z->resign) > lifetime - (OFFSET)) )
 639         {
 640                 keychange = 1;
 641                 verbmesg (1, z, "\tNew key for publishing needed\n");
 642                 nextkey = genkey (listp, dir, domain, DKI_ZSK, z, DKI_PUB);
 643
 644                 if ( nextkey )
 645                 {
 646                         verbmesg (1, z, "\t\t->creating new key %d\n", nextkey->tag);
 647                         lg_mesg (LG_INFO, "\"%s\": new key %d generated for publishing", domain, nextkey->tag);
 648                 }
 649                 else
 650                 {
 651                         error ("\tcould not generate new ZSK: \"%s\"\n", dki_geterrstr());
 652                         lg_mesg (LG_ERROR, "\"%s\": can't generate new ZSK: \"%s\"",
 653                                                                 domain, dki_geterrstr());
 654                 }
 655         }
 656
 657         /* is a second algorithm requested ? (since 0.99) */
 658         if ( z->k2_algo && z->k2_algo != z->k_algo )
 659         {
 660                 /* check for zsk supporting the additional algorithm */
 661                 akey = (dki_t *)dki_findalgo (*listp, DKI_ZSK, z->k2_algo, 'a', 1);
 662                 if ( akey == NULL )
 663                 {
 664                         verbmesg (1, z, "\tNo active ZSK for second algorithm found: generate new one\n");
 665                         akey = genkey2 (listp, dir, domain, DKI_ZSK, z, DKI_ACTIVE);
 666                         if ( !akey )
 667                         {
 668                                 error ("\tcould not generate new ZSK for 2nd algorithm\n");
 669                                 lg_mesg (LG_ERROR, "\"%s\": can't generate new ZSK for 2nd algorithm: \"%s\"",
 670                                                                         domain, dki_geterrstr());
 671                         }
 672                         else
 673                                 lg_mesg (LG_INFO, "\"%s\": generated new ZSK %d for 2nd algorithm",
 674                                                                                 domain, akey->tag);
 675                         return 1;       /* return value of 1 forces a resigning of the zone */
 676                 }
 677         }
 678
 679         return keychange;
 680 }
 681