src/pki/commands/signcrl.c

   1 /*
   2  * Copyright (C) 2010 Martin Willi
   3  * Copyright (C) 2010 revosec AG
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include <time.h>
  17
  18 #include "pki.h"
  19
  20 #include <utils/debug.h>
  21 #include <collections/linked_list.h>
  22 #include <credentials/certificates/certificate.h>
  23 #include <credentials/certificates/x509.h>
  24 #include <credentials/certificates/crl.h>
  25
  26
  27 /**
  28  * Entry for a revoked certificate
  29  */
  30 typedef struct {
  31         chunk_t serial;
  32         crl_reason_t reason;
  33         time_t date;
  34 } revoked_t;
  35
  36 /**
  37  * Add a revocation to the list
  38  */
  39 static void add_revoked(linked_list_t *list,
  40                                                 chunk_t serial, crl_reason_t reason, time_t date)
  41 {
  42         revoked_t *revoked;
  43
  44         INIT(revoked,
  45                 .serial = chunk_clone(serial),
  46                 .reason = reason,
  47                 .date = date,
  48         );
  49         list->insert_last(list, revoked);
  50 }
  51
  52 /**
  53  * Destroy a reason entry
  54  */
  55 static void revoked_destroy(revoked_t *revoked)
  56 {
  57         free(revoked->serial.ptr);
  58         free(revoked);
  59 }
  60
  61 /**
  62  * Filter for revoked enumerator
  63  */
  64 static bool filter(void *data, revoked_t **revoked, chunk_t *serial, void *p2,
  65                                    time_t *date, void *p3, crl_reason_t *reason)
  66 {
  67         *serial = (*revoked)->serial;
  68         *date = (*revoked)->date;
  69         *reason = (*revoked)->reason;
  70         return TRUE;
  71 }
  72
  73 /**
  74  * Extract the serial of a certificate, write it into buf
  75  */
  76 static int read_serial(char *file, char *buf, int buflen)
  77 {
  78         certificate_t *cert;
  79         x509_t *x509;
  80         chunk_t serial;
  81
  82         x509 = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
  83                                                           BUILD_FROM_FILE, file, BUILD_END);
  84         cert = &x509->interface;
  85         if (!cert)
  86         {
  87                 return -1;
  88         }
  89         serial = x509->get_serial(x509);
  90         if (serial.len == 0 || serial.len > buflen)
  91         {
  92                 cert->destroy(cert);
  93                 return -2;
  94         }
  95         memcpy(buf, serial.ptr, serial.len);
  96         cert->destroy(cert);
  97         return serial.len;
  98 }
  99
 100 /**
 101  * Destroy a CDP
 102  */
 103 static void cdp_destroy(x509_cdp_t *this)
 104 {
 105         free(this->uri);
 106         free(this);
 107 }
 108
 109 /**
 110  * Sign a CRL
 111  */
 112 static int sign_crl()
 113 {
 114         cred_encoding_type_t form = CERT_ASN1_DER;
 115         private_key_t *private = NULL;
 116         public_key_t *public = NULL;
 117         certificate_t *ca = NULL, *crl = NULL;
 118         crl_t *lastcrl = NULL;
 119         x509_t *x509;
 120         hash_algorithm_t digest = HASH_SHA1;
 121         char *arg, *cacert = NULL, *cakey = NULL, *lastupdate = NULL, *error = NULL;
 122         char *basecrl = NULL;
 123         char serial[512], *keyid = NULL;
 124         int serial_len = 0;
 125         crl_reason_t reason = CRL_REASON_UNSPECIFIED;
 126         time_t thisUpdate, nextUpdate, date = time(NULL);
 127         time_t lifetime = 15 * 24 * 60 * 60;
 128         char *datetu = NULL, *datenu = NULL, *dateform = NULL;
 129         linked_list_t *list, *cdps;
 130         enumerator_t *enumerator, *lastenum = NULL;
 131         x509_cdp_t *cdp;
 132         chunk_t crl_serial = chunk_empty, baseCrlNumber = chunk_empty;
 133         chunk_t encoding = chunk_empty;
 134
 135         list = linked_list_create();
 136         cdps = linked_list_create();
 137
 138         while (TRUE)
 139         {
 140                 switch (command_getopt(&arg))
 141                 {
 142                         case 'h':
 143                                 goto usage;
 144                         case 'g':
 145                                 if (!enum_from_name(hash_algorithm_short_names, arg, &digest))
 146                                 {
 147                                         error = "invalid --digest type";
 148                                         goto usage;
 149                                 }
 150                                 continue;
 151                         case 'c':
 152                                 cacert = arg;
 153                                 continue;
 154                         case 'k':
 155                                 cakey = arg;
 156                                 continue;
 157                         case 'x':
 158                                 keyid = arg;
 159                                 continue;
 160                         case 'a':
 161                                 lastupdate = arg;
 162                                 continue;
 163                         case 'l':
 164                                 lifetime = atoi(arg) * 24 * 60 * 60;
 165                                 if (!lifetime)
 166                                 {
 167                                         error = "invalid --lifetime value";
 168                                         goto usage;
 169                                 }
 170                                 continue;
 171                         case 'D':
 172                                 dateform = arg;
 173                                 continue;
 174                         case 'F':
 175                                 datetu = arg;
 176                                 continue;
 177                         case 'T':
 178                                 datenu = arg;
 179                                 continue;
 180                         case 'z':
 181                                 serial_len = read_serial(arg, serial, sizeof(serial));
 182                                 if (serial_len < 0)
 183                                 {
 184                                         snprintf(serial, sizeof(serial),
 185                                                          "parsing certificate '%s' failed", arg);
 186                                         error = serial;
 187                                         goto error;
 188                                 }
 189                                 add_revoked(list, chunk_create(serial, serial_len), reason, date);
 190                                 date = time(NULL);
 191                                 serial_len = 0;
 192                                 reason = CRL_REASON_UNSPECIFIED;
 193                                 continue;
 194                         case 's':
 195                         {
 196                                 chunk_t chunk;
 197                                 int hex_len;
 198
 199                                 hex_len = strlen(arg);
 200                                 if ((hex_len / 2) + (hex_len % 2) > sizeof(serial))
 201                                 {
 202                                         error = "invalid serial";
 203                                         goto usage;
 204                                 }
 205                                 chunk = chunk_from_hex(chunk_create(arg, hex_len), serial);
 206                                 serial_len = chunk.len;
 207                                 add_revoked(list, chunk_create(serial, serial_len), reason, date);
 208                                 date = time(NULL);
 209                                 serial_len = 0;
 210                                 reason = CRL_REASON_UNSPECIFIED;
 211                                 continue;
 212                         }
 213                         case 'b':
 214                                 basecrl = arg;
 215                                 continue;
 216                         case 'u':
 217                                 INIT(cdp,
 218                                         .uri = strdup(arg),
 219                                 );
 220                                 cdps->insert_last(cdps, cdp);
 221                                 continue;
 222                         case 'r':
 223                                 if (streq(arg, "key-compromise"))
 224                                 {
 225                                         reason = CRL_REASON_KEY_COMPROMISE;
 226                                 }
 227                                 else if (streq(arg, "ca-compromise"))
 228                                 {
 229                                         reason = CRL_REASON_CA_COMPROMISE;
 230                                 }
 231                                 else if (streq(arg, "affiliation-changed"))
 232                                 {
 233                                         reason = CRL_REASON_AFFILIATION_CHANGED;
 234                                 }
 235                                 else if (streq(arg, "superseded"))
 236                                 {
 237                                         reason = CRL_REASON_SUPERSEDED;
 238                                 }
 239                                 else if (streq(arg, "cessation-of-operation"))
 240                                 {
 241                                         reason = CRL_REASON_CESSATION_OF_OPERATON;
 242                                 }
 243                                 else if (streq(arg, "certificate-hold"))
 244                                 {
 245                                         reason = CRL_REASON_CERTIFICATE_HOLD;
 246                                 }
 247                                 else
 248                                 {
 249                                         error = "invalid revocation reason";
 250                                         goto usage;
 251                                 }
 252                                 continue;
 253                         case 'd':
 254                                 date = atol(arg);
 255                                 if (!date)
 256                                 {
 257                                         error = "invalid date";
 258                                         goto usage;
 259                                 }
 260                                 continue;
 261                         case 'f':
 262                                 if (!get_form(arg, &form, CRED_CERTIFICATE))
 263                                 {
 264                                         error = "invalid output format";
 265                                         goto usage;
 266                                 }
 267                                 continue;
 268                         case EOF:
 269                                 break;
 270                         default:
 271                                 error = "invalid --signcrl option";
 272                                 goto usage;
 273                 }
 274                 break;
 275         }
 276
 277         if (!cacert)
 278         {
 279                 error = "--cacert is required";
 280                 goto usage;
 281         }
 282         if (!cakey && !keyid)
 283         {
 284                 error = "--cakey or --keyid is required";
 285                 goto usage;
 286         }
 287         if (!calculate_lifetime(dateform, datetu, datenu, lifetime,
 288                                                         &thisUpdate, &nextUpdate))
 289         {
 290                 error = "invalid --this/next-update datetime";
 291                 goto usage;
 292         }
 293
 294         ca = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
 295                                                         BUILD_FROM_FILE, cacert, BUILD_END);
 296         if (!ca)
 297         {
 298                 error = "parsing CA certificate failed";
 299                 goto error;
 300         }
 301         x509 = (x509_t*)ca;
 302         if (!(x509->get_flags(x509) & (X509_CA | X509_CRL_SIGN)))
 303         {
 304                 error = "CA certificate misses CA basicConstraint / CRLSign keyUsage";
 305                 goto error;
 306         }
 307         public = ca->get_public_key(ca);
 308         if (!public)
 309         {
 310                 error = "extracting CA certificate public key failed";
 311                 goto error;
 312         }
 313         if (cakey)
 314         {
 315                 private = lib->creds->create(lib->creds, CRED_PRIVATE_KEY,
 316                                                                          public->get_type(public),
 317                                                                          BUILD_FROM_FILE, cakey, BUILD_END);
 318         }
 319         else
 320         {
 321                 chunk_t chunk;
 322
 323                 chunk = chunk_from_hex(chunk_create(keyid, strlen(keyid)), NULL);
 324                 private = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_ANY,
 325                                                                          BUILD_PKCS11_KEYID, chunk, BUILD_END);
 326                 free(chunk.ptr);
 327         }
 328         if (!private)
 329         {
 330                 error = "loading CA private key failed";
 331                 goto error;
 332         }
 333         if (!private->belongs_to(private, public))
 334         {
 335                 error = "CA private key does not match CA certificate";
 336                 goto error;
 337         }
 338
 339         if (basecrl)
 340         {
 341                 lastcrl = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509_CRL,
 342                                                                          BUILD_FROM_FILE, basecrl, BUILD_END);
 343                 if (!lastcrl)
 344                 {
 345                         error = "loading base CRL failed";
 346                         goto error;
 347                 }
 348                 baseCrlNumber = chunk_clone(lastcrl->get_serial(lastcrl));
 349                 crl_serial = baseCrlNumber;
 350                 DESTROY_IF((certificate_t*)lastcrl);
 351                 lastcrl = NULL;
 352         }
 353
 354         if (lastupdate)
 355         {
 356                 lastcrl = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509_CRL,
 357                                                                          BUILD_FROM_FILE, lastupdate, BUILD_END);
 358                 if (!lastcrl)
 359                 {
 360                         error = "loading lastUpdate CRL failed";
 361                         goto error;
 362                 }
 363                 crl_serial = lastcrl->get_serial(lastcrl);
 364                 lastenum = lastcrl->create_enumerator(lastcrl);
 365         }
 366         else
 367         {
 368                 crl_serial = chunk_from_chars(0x00);
 369                 lastenum = enumerator_create_empty();
 370         }
 371
 372         /* remove superfluous leading zeros */
 373         while (crl_serial.len > 1 && crl_serial.ptr[0] == 0x00 &&
 374                   (crl_serial.ptr[1] & 0x80) == 0x00)
 375         {
 376                 crl_serial = chunk_skip_zero(crl_serial);
 377         }
 378         crl_serial = chunk_clone(crl_serial);
 379
 380         /* increment the serial number by one */
 381         chunk_increment(crl_serial);
 382
 383         enumerator = enumerator_create_filter(list->create_enumerator(list),
 384                                                                                   (void*)filter, NULL, NULL);
 385         crl = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509_CRL,
 386                         BUILD_SIGNING_KEY, private, BUILD_SIGNING_CERT, ca,
 387                         BUILD_SERIAL, crl_serial,
 388                         BUILD_NOT_BEFORE_TIME, thisUpdate, BUILD_NOT_AFTER_TIME, nextUpdate,
 389                         BUILD_REVOKED_ENUMERATOR, enumerator,
 390                         BUILD_REVOKED_ENUMERATOR, lastenum, BUILD_DIGEST_ALG, digest,
 391                         BUILD_CRL_DISTRIBUTION_POINTS, cdps, BUILD_BASE_CRL, baseCrlNumber,
 392                         BUILD_END);
 393         enumerator->destroy(enumerator);
 394         lastenum->destroy(lastenum);
 395         DESTROY_IF((certificate_t*)lastcrl);
 396         free(crl_serial.ptr);
 397
 398         if (!crl)
 399         {
 400                 error = "generating CRL failed";
 401                 goto error;
 402         }
 403         if (!crl->get_encoding(crl, form, &encoding))
 404         {
 405                 error = "encoding CRL failed";
 406                 goto error;
 407         }
 408         set_file_mode(stdout, form);
 409         if (fwrite(encoding.ptr, encoding.len, 1, stdout) != 1)
 410         {
 411                 error = "writing CRL failed";
 412                 goto error;
 413         }
 414
 415 error:
 416         DESTROY_IF(public);
 417         DESTROY_IF(private);
 418         DESTROY_IF(ca);
 419         DESTROY_IF(crl);
 420         free(encoding.ptr);
 421         free(baseCrlNumber.ptr);
 422         list->destroy_function(list, (void*)revoked_destroy);
 423         cdps->destroy_function(cdps, (void*)cdp_destroy);
 424         if (error)
 425         {
 426                 fprintf(stderr, "%s\n", error);
 427                 return 1;
 428         }
 429         return 0;
 430
 431 usage:
 432         list->destroy_function(list, (void*)revoked_destroy);
 433         cdps->destroy_function(cdps, (void*)cdp_destroy);
 434         return command_usage(error);
 435 }
 436
 437 /**
 438  * Register the command.
 439  */
 440 static void __attribute__ ((constructor))reg()
 441 {
 442         command_register((command_t) {
 443                 sign_crl, 'c', "signcrl",
 444                 "issue a CRL using a CA certificate and key",
 445                 {"--cacert file --cakey file|--cakeyid hex [--lifetime days]",
 446                  "  [--lastcrl crl] [--basecrl crl] [--crluri uri]+",
 447                  "  [[--reason key-compromise|ca-compromise|affiliation-changed|",
 448                  "             superseded|cessation-of-operation|certificate-hold]",
 449                  "   [--date timestamp] --cert file|--serial hex]*",
 450                  "  [--digest md5|sha1|sha224|sha256|sha384|sha512]",
 451                  "  [--outform der|pem]"},
 452                 {
 453                         {"help",                'h', 0, "show usage information"},
 454                         {"cacert",              'c', 1, "CA certificate file"},
 455                         {"cakey",               'k', 1, "CA private key file"},
 456                         {"cakeyid",             'x', 1, "keyid on smartcard of CA private key"},
 457                         {"lifetime",    'l', 1, "days the CRL gets a nextUpdate, default: 15"},
 458                         {"this-update", 'F', 1, "date/time the validity of the CRL starts"},
 459                         {"next-update", 'T', 1, "date/time the validity of the CRL ends"},
 460                         {"dateform",    'D', 1, "strptime(3) input format, default: %d.%m.%y %T"},
 461                         {"lastcrl",             'a', 1, "CRL of lastUpdate to copy revocations from"},
 462                         {"basecrl",             'b', 1, "base CRL to create a delta CRL for"},
 463                         {"crluri",              'u', 1, "freshest delta CRL URI to include"},
 464                         {"cert",                'z', 1, "certificate file to revoke"},
 465                         {"serial",              's', 1, "hex encoded certificate serial number to revoke"},
 466                         {"reason",              'r', 1, "reason for certificate revocation"},
 467                         {"date",                'd', 1, "revocation date as unix timestamp, default: now"},
 468                         {"digest",              'g', 1, "digest for signature creation, default: sha1"},
 469                         {"outform",             'f', 1, "encoding of generated crl, default: der"},
 470                 }
 471         });
 472 }