lib/hx509/print.c

   1 /*
   2  * Copyright (c) 2004 - 2007 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 "hx_locl.h"
  35
  36 /**
  37  * @page page_print Hx509 printing functions
  38  *
  39  * See the library functions here: @ref hx509_print
  40  */
  41
  42 struct hx509_validate_ctx_data {
  43     int flags;
  44     hx509_vprint_func vprint_func;
  45     void *ctx;
  46 };
  47
  48 struct cert_status {
  49     unsigned int selfsigned:1;
  50     unsigned int isca:1;
  51     unsigned int isproxy:1;
  52     unsigned int haveSAN:1;
  53     unsigned int haveIAN:1;
  54     unsigned int haveSKI:1;
  55     unsigned int haveAKI:1;
  56     unsigned int haveCRLDP:1;
  57 };
  58
  59
  60 /*
  61  *
  62  */
  63
  64 static int
  65 Time2string(const Time *T, char **str)
  66 {
  67     time_t t;
  68     char *s;
  69     struct tm *tm;
  70
  71     *str = NULL;
  72     t = _hx509_Time2time_t(T);
  73     tm = gmtime (&t);
  74     s = malloc(30);
  75     if (s == NULL)
  76         return ENOMEM;
  77     strftime(s, 30, "%Y-%m-%d %H:%M:%S", tm);
  78     *str = s;
  79     return 0;
  80 }
  81
  82 /**
  83  * Helper function to print on stdout for:
  84  * - hx509_oid_print(),
  85  * - hx509_bitstring_print(),
  86  * - hx509_validate_ctx_set_print().
  87  *
  88  * @param ctx the context to the print function. If the ctx is NULL,
  89  * stdout is used.
  90  * @param fmt the printing format.
  91  * @param va the argumet list.
  92  *
  93  * @ingroup hx509_print
  94  */
  95
  96 void
  97 hx509_print_stdout(void *ctx, const char *fmt, va_list va)
  98 {
  99     FILE *f = ctx;
 100     if (f == NULL)
 101         f = stdout;
 102     vfprintf(f, fmt, va);
 103 }
 104
 105 static void
 106 print_func(hx509_vprint_func func, void *ctx, const char *fmt, ...)
 107 {
 108     va_list va;
 109     va_start(va, fmt);
 110     (*func)(ctx, fmt, va);
 111     va_end(va);
 112 }
 113
 114 /**
 115  * Print a oid to a string.
 116  *
 117  * @param oid oid to print
 118  * @param str allocated string, free with hx509_xfree().
 119  *
 120  * @return An hx509 error code, see hx509_get_error_string().
 121  *
 122  * @ingroup hx509_print
 123  */
 124
 125 int
 126 hx509_oid_sprint(const heim_oid *oid, char **str)
 127 {
 128     return der_print_heim_oid(oid, '.', str);
 129 }
 130
 131 /**
 132  * Print a oid using a hx509_vprint_func function. To print to stdout
 133  * use hx509_print_stdout().
 134  *
 135  * @param oid oid to print
 136  * @param func hx509_vprint_func to print with.
 137  * @param ctx context variable to hx509_vprint_func function.
 138  *
 139  * @ingroup hx509_print
 140  */
 141
 142 void
 143 hx509_oid_print(const heim_oid *oid, hx509_vprint_func func, void *ctx)
 144 {
 145     char *str;
 146     hx509_oid_sprint(oid, &str);
 147     print_func(func, ctx, "%s", str);
 148     free(str);
 149 }
 150
 151 /**
 152  * Print a bitstring using a hx509_vprint_func function. To print to
 153  * stdout use hx509_print_stdout().
 154  *
 155  * @param b bit string to print.
 156  * @param func hx509_vprint_func to print with.
 157  * @param ctx context variable to hx509_vprint_func function.
 158  *
 159  * @ingroup hx509_print
 160  */
 161
 162 void
 163 hx509_bitstring_print(const heim_bit_string *b,
 164                       hx509_vprint_func func, void *ctx)
 165 {
 166     int i;
 167     print_func(func, ctx, "\tlength: %d\n\t", b->length);
 168     for (i = 0; i < (b->length + 7) / 8; i++)
 169         print_func(func, ctx, "%02x%s%s",
 170                    ((unsigned char *)b->data)[i],
 171                    i < (b->length - 7) / 8
 172                    && (i == 0 || (i % 16) != 15) ? ":" : "",
 173                    i != 0 && (i % 16) == 15 ?
 174                    (i <= ((b->length + 7) / 8 - 2) ? "\n\t" : "\n"):"");
 175 }
 176
 177 /**
 178  * Print certificate usage for a certificate to a string.
 179  *
 180  * @param context A hx509 context.
 181  * @param c a certificate print the keyusage for.
 182  * @param s the return string with the keysage printed in to, free
 183  * with hx509_xfree().
 184  *
 185  * @return An hx509 error code, see hx509_get_error_string().
 186  *
 187  * @ingroup hx509_print
 188  */
 189
 190 int
 191 hx509_cert_keyusage_print(hx509_context context, hx509_cert c, char **s)
 192 {
 193     KeyUsage ku;
 194     char buf[256];
 195     int ret;
 196
 197     *s = NULL;
 198
 199     ret = _hx509_cert_get_keyusage(context, c, &ku);
 200     if (ret)
 201         return ret;
 202     unparse_flags(KeyUsage2int(ku), asn1_KeyUsage_units(), buf, sizeof(buf));
 203     *s = strdup(buf);
 204     if (*s == NULL) {
 205         hx509_set_error_string(context, 0, ENOMEM, "out of memory");
 206         return ENOMEM;
 207     }
 208
 209     return 0;
 210 }
 211
 212 /*
 213  *
 214  */
 215
 216 static void
 217 validate_vprint(void *c, const char *fmt, va_list va)
 218 {
 219     hx509_validate_ctx ctx = c;
 220     if (ctx->vprint_func == NULL)
 221         return;
 222     (ctx->vprint_func)(ctx->ctx, fmt, va);
 223 }
 224
 225 static void
 226 validate_print(hx509_validate_ctx ctx, int flags, const char *fmt, ...)
 227 {
 228     va_list va;
 229     if ((ctx->flags & flags) == 0)
 230         return;
 231     va_start(va, fmt);
 232     validate_vprint(ctx, fmt, va);
 233     va_end(va);
 234 }
 235
 236 /*
 237  * Dont Care, SHOULD critical, SHOULD NOT critical, MUST critical,
 238  * MUST NOT critical
 239  */
 240 enum critical_flag { D_C = 0, S_C, S_N_C, M_C, M_N_C };
 241
 242 static int
 243 check_Null(hx509_validate_ctx ctx,
 244            struct cert_status *status,
 245            enum critical_flag cf, const Extension *e)
 246 {
 247     switch(cf) {
 248     case D_C:
 249         break;
 250     case S_C:
 251         if (!e->critical)
 252             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 253                            "\tCritical not set on SHOULD\n");
 254         break;
 255     case S_N_C:
 256         if (e->critical)
 257             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 258                            "\tCritical set on SHOULD NOT\n");
 259         break;
 260     case M_C:
 261         if (!e->critical)
 262             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 263                            "\tCritical not set on MUST\n");
 264         break;
 265     case M_N_C:
 266         if (e->critical)
 267             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 268                            "\tCritical set on MUST NOT\n");
 269         break;
 270     default:
 271         _hx509_abort("internal check_Null state error");
 272     }
 273     return 0;
 274 }
 275
 276 static int
 277 check_subjectKeyIdentifier(hx509_validate_ctx ctx,
 278                            struct cert_status *status,
 279                            enum critical_flag cf,
 280                            const Extension *e)
 281 {
 282     SubjectKeyIdentifier si;
 283     size_t size;
 284     int ret;
 285
 286     status->haveSKI = 1;
 287     check_Null(ctx, status, cf, e);
 288
 289     ret = decode_SubjectKeyIdentifier(e->extnValue.data,
 290                                       e->extnValue.length,
 291                                       &si, &size);
 292     if (ret) {
 293         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 294                        "Decoding SubjectKeyIdentifier failed: %d", ret);
 295         return 1;
 296     }
 297     if (size != e->extnValue.length) {
 298         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 299                        "Decoding SKI ahve extra bits on the end");
 300         return 1;
 301     }
 302     if (si.length == 0)
 303         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 304                        "SKI is too short (0 bytes)");
 305     if (si.length > 20)
 306         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 307                        "SKI is too long");
 308
 309     {
 310         char *id;
 311         hex_encode(si.data, si.length, &id);
 312         if (id) {
 313             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 314                            "\tsubject key id: %s\n", id);
 315             free(id);
 316         }
 317     }
 318
 319     free_SubjectKeyIdentifier(&si);
 320
 321     return 0;
 322 }
 323
 324 static int
 325 check_authorityKeyIdentifier(hx509_validate_ctx ctx,
 326                              struct cert_status *status,
 327                              enum critical_flag cf,
 328                              const Extension *e)
 329 {
 330     AuthorityKeyIdentifier ai;
 331     size_t size;
 332     int ret;
 333
 334     status->haveAKI = 1;
 335     check_Null(ctx, status, cf, e);
 336
 337     ret = decode_AuthorityKeyIdentifier(e->extnValue.data,
 338                                         e->extnValue.length,
 339                                         &ai, &size);
 340     if (ret) {
 341         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 342                        "Decoding AuthorityKeyIdentifier failed: %d", ret);
 343         return 1;
 344     }
 345     if (size != e->extnValue.length) {
 346         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 347                        "Decoding SKI ahve extra bits on the end");
 348         return 1;
 349     }
 350
 351     if (ai.keyIdentifier) {
 352         char *id;
 353         hex_encode(ai.keyIdentifier->data, ai.keyIdentifier->length, &id);
 354         if (id) {
 355             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 356                            "\tauthority key id: %s\n", id);
 357             free(id);
 358         }
 359     }
 360
 361     return 0;
 362 }
 363
 364 static int
 365 check_extKeyUsage(hx509_validate_ctx ctx,
 366                   struct cert_status *status,
 367                   enum critical_flag cf,
 368                   const Extension *e)
 369 {
 370     ExtKeyUsage eku;
 371     size_t size, i;
 372     int ret;
 373
 374     check_Null(ctx, status, cf, e);
 375
 376     ret = decode_ExtKeyUsage(e->extnValue.data,
 377                              e->extnValue.length,
 378                              &eku, &size);
 379     if (ret) {
 380         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 381                        "Decoding ExtKeyUsage failed: %d", ret);
 382         return 1;
 383     }
 384     if (size != e->extnValue.length) {
 385         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 386                        "Padding data in EKU");
 387         free_ExtKeyUsage(&eku);
 388         return 1;
 389     }
 390     if (eku.len == 0) {
 391         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 392                        "ExtKeyUsage length is 0");
 393         return 1;
 394     }
 395
 396     for (i = 0; i < eku.len; i++) {
 397         char *str;
 398         ret = der_print_heim_oid (&eku.val[i], '.', &str);
 399         if (ret) {
 400             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 401                            "\tEKU: failed to print oid %d", i);
 402             free_ExtKeyUsage(&eku);
 403             return 1;
 404         }
 405         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 406                        "\teku-%d: %s\n", i, str);;
 407         free(str);
 408     }
 409
 410     free_ExtKeyUsage(&eku);
 411
 412     return 0;
 413 }
 414
 415 static int
 416 check_pkinit_san(hx509_validate_ctx ctx, heim_any *a)
 417 {
 418     KRB5PrincipalName kn;
 419     unsigned i;
 420     size_t size;
 421     int ret;
 422
 423     ret = decode_KRB5PrincipalName(a->data, a->length, &kn, &size);
 424     if (ret) {
 425         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 426                        "Decoding kerberos name in SAN failed: %d", ret);
 427         return 1;
 428     }
 429
 430     if (size != a->length) {
 431         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 432                        "Decoding kerberos name have extra bits on the end");
 433         return 1;
 434     }
 435
 436     /* print kerberos principal, add code to quote / within components */
 437     for (i = 0; i < kn.principalName.name_string.len; i++) {
 438         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s",
 439                        kn.principalName.name_string.val[i]);
 440         if (i + 1 < kn.principalName.name_string.len)
 441             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "/");
 442     }
 443     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "@");
 444     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", kn.realm);
 445
 446     free_KRB5PrincipalName(&kn);
 447     return 0;
 448 }
 449
 450 static int
 451 check_utf8_string_san(hx509_validate_ctx ctx, heim_any *a)
 452 {
 453     PKIXXmppAddr jid;
 454     size_t size;
 455     int ret;
 456
 457     ret = decode_PKIXXmppAddr(a->data, a->length, &jid, &size);
 458     if (ret) {
 459         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 460                        "Decoding JID in SAN failed: %d", ret);
 461         return 1;
 462     }
 463
 464     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", jid);
 465     free_PKIXXmppAddr(&jid);
 466
 467     return 0;
 468 }
 469
 470 static int
 471 check_altnull(hx509_validate_ctx ctx, heim_any *a)
 472 {
 473     return 0;
 474 }
 475
 476 static int
 477 check_CRLDistributionPoints(hx509_validate_ctx ctx,
 478                            struct cert_status *status,
 479                            enum critical_flag cf,
 480                            const Extension *e)
 481 {
 482     CRLDistributionPoints dp;
 483     size_t size;
 484     int ret, i;
 485
 486     check_Null(ctx, status, cf, e);
 487
 488     ret = decode_CRLDistributionPoints(e->extnValue.data,
 489                                        e->extnValue.length,
 490                                        &dp, &size);
 491     if (ret) {
 492         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 493                        "Decoding CRL Distribution Points failed: %d\n", ret);
 494         return 1;
 495     }
 496
 497     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "CRL Distribution Points:\n");
 498     for (i = 0 ; i < dp.len; i++) {
 499         if (dp.val[i].distributionPoint) {
 500             DistributionPointName dpname;
 501             heim_any *data = dp.val[i].distributionPoint;
 502             int j;
 503
 504             ret = decode_DistributionPointName(data->data, data->length,
 505                                                &dpname, NULL);
 506             if (ret) {
 507                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 508                                "Failed to parse CRL Distribution Point Name: %d\n", ret);
 509                 continue;
 510             }
 511
 512             switch (dpname.element) {
 513             case choice_DistributionPointName_fullName:
 514                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "Fullname:\n");
 515
 516                 for (j = 0 ; j < dpname.u.fullName.len; j++) {
 517                     char *s;
 518                     GeneralName *name = &dpname.u.fullName.val[j];
 519
 520                     ret = hx509_general_name_unparse(name, &s);
 521                     if (ret == 0 && s != NULL) {
 522                         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "   %s\n", s);
 523                         free(s);
 524                     }
 525                 }
 526                 break;
 527             case choice_DistributionPointName_nameRelativeToCRLIssuer:
 528                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 529                                "Unknown nameRelativeToCRLIssuer");
 530                 break;
 531             default:
 532                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 533                                "Unknown DistributionPointName");
 534                 break;
 535             }
 536             free_DistributionPointName(&dpname);
 537         }
 538     }
 539     free_CRLDistributionPoints(&dp);
 540
 541     status->haveCRLDP = 1;
 542
 543     return 0;
 544 }
 545
 546
 547 struct {
 548     const char *name;
 549     const heim_oid *oid;
 550     int (*func)(hx509_validate_ctx, heim_any *);
 551 } altname_types[] = {
 552     { "pk-init", &asn1_oid_id_pkinit_san, check_pkinit_san },
 553     { "jabber", &asn1_oid_id_pkix_on_xmppAddr, check_utf8_string_san },
 554     { "dns-srv", &asn1_oid_id_pkix_on_dnsSRV, check_altnull },
 555     { "card-id", &asn1_oid_id_uspkicommon_card_id, check_altnull },
 556     { "Microsoft NT-PRINCIPAL-NAME", &asn1_oid_id_pkinit_ms_san, check_utf8_string_san }
 557 };
 558
 559 static int
 560 check_altName(hx509_validate_ctx ctx,
 561               struct cert_status *status,
 562               const char *name,
 563               enum critical_flag cf,
 564               const Extension *e)
 565 {
 566     GeneralNames gn;
 567     size_t size;
 568     int ret, i;
 569
 570     check_Null(ctx, status, cf, e);
 571
 572     if (e->extnValue.length == 0) {
 573         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 574                        "%sAltName empty, not allowed", name);
 575         return 1;
 576     }
 577     ret = decode_GeneralNames(e->extnValue.data, e->extnValue.length,
 578                               &gn, &size);
 579     if (ret) {
 580         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 581                        "\tret = %d while decoding %s GeneralNames\n",
 582                        ret, name);
 583         return 1;
 584     }
 585     if (gn.len == 0) {
 586         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 587                        "%sAltName generalName empty, not allowed\n", name);
 588         return 1;
 589     }
 590
 591     for (i = 0; i < gn.len; i++) {
 592         switch (gn.val[i].element) {
 593         case choice_GeneralName_otherName: {
 594             unsigned j;
 595
 596             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 597                            "%sAltName otherName ", name);
 598
 599             for (j = 0; j < sizeof(altname_types)/sizeof(altname_types[0]); j++) {
 600                 if (der_heim_oid_cmp(altname_types[j].oid,
 601                                      &gn.val[i].u.otherName.type_id) != 0)
 602                     continue;
 603
 604                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s: ",
 605                                altname_types[j].name);
 606                 (*altname_types[j].func)(ctx, &gn.val[i].u.otherName.value);
 607                 break;
 608             }
 609             if (j == sizeof(altname_types)/sizeof(altname_types[0])) {
 610                 hx509_oid_print(&gn.val[i].u.otherName.type_id,
 611                                 validate_vprint, ctx);
 612                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, " unknown");
 613             }
 614             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\n");
 615             break;
 616         }
 617         default: {
 618             char *s;
 619             ret = hx509_general_name_unparse(&gn.val[i], &s);
 620             if (ret) {
 621                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 622                                "ret = %d unparsing GeneralName\n", ret);
 623                 return 1;
 624             }
 625             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s\n", s);
 626             free(s);
 627             break;
 628         }
 629         }
 630     }
 631
 632     free_GeneralNames(&gn);
 633
 634     return 0;
 635 }
 636
 637 static int
 638 check_subjectAltName(hx509_validate_ctx ctx,
 639                      struct cert_status *status,
 640                      enum critical_flag cf,
 641                      const Extension *e)
 642 {
 643     status->haveSAN = 1;
 644     return check_altName(ctx, status, "subject", cf, e);
 645 }
 646
 647 static int
 648 check_issuerAltName(hx509_validate_ctx ctx,
 649                     struct cert_status *status,
 650                      enum critical_flag cf,
 651                      const Extension *e)
 652 {
 653     status->haveIAN = 1;
 654     return check_altName(ctx, status, "issuer", cf, e);
 655 }
 656
 657
 658 static int
 659 check_basicConstraints(hx509_validate_ctx ctx,
 660                        struct cert_status *status,
 661                        enum critical_flag cf,
 662                        const Extension *e)
 663 {
 664     BasicConstraints b;
 665     size_t size;
 666     int ret;
 667
 668     check_Null(ctx, status, cf, e);
 669
 670     ret = decode_BasicConstraints(e->extnValue.data, e->extnValue.length,
 671                                   &b, &size);
 672     if (ret) {
 673         printf("\tret = %d while decoding BasicConstraints\n", ret);
 674         return 0;
 675     }
 676     if (size != e->extnValue.length)
 677         printf("\tlength of der data isn't same as extension\n");
 678
 679     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 680                    "\tis %sa CA\n", b.cA && *b.cA ? "" : "NOT ");
 681     if (b.pathLenConstraint)
 682         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 683                        "\tpathLenConstraint: %d\n", *b.pathLenConstraint);
 684
 685     if (b.cA) {
 686         if (*b.cA) {
 687             if (!e->critical)
 688                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 689                                "Is a CA and not BasicConstraints CRITICAL\n");
 690             status->isca = 1;
 691         }
 692         else
 693             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 694                            "cA is FALSE, not allowed to be\n");
 695     }
 696     free_BasicConstraints(&b);
 697
 698     return 0;
 699 }
 700
 701 static int
 702 check_proxyCertInfo(hx509_validate_ctx ctx,
 703                     struct cert_status *status,
 704                     enum critical_flag cf,
 705                     const Extension *e)
 706 {
 707     check_Null(ctx, status, cf, e);
 708     status->isproxy = 1;
 709     return 0;
 710 }
 711
 712 static int
 713 check_authorityInfoAccess(hx509_validate_ctx ctx,
 714                           struct cert_status *status,
 715                           enum critical_flag cf,
 716                           const Extension *e)
 717 {
 718     AuthorityInfoAccessSyntax aia;
 719     size_t size;
 720     int ret, i;
 721
 722     check_Null(ctx, status, cf, e);
 723
 724     ret = decode_AuthorityInfoAccessSyntax(e->extnValue.data,
 725                                            e->extnValue.length,
 726                                            &aia, &size);
 727     if (ret) {
 728         printf("\tret = %d while decoding AuthorityInfoAccessSyntax\n", ret);
 729         return 0;
 730     }
 731
 732     for (i = 0; i < aia.len; i++) {
 733         char *str;
 734         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 735                        "\ttype: ");
 736         hx509_oid_print(&aia.val[i].accessMethod, validate_vprint, ctx);
 737         hx509_general_name_unparse(&aia.val[i].accessLocation, &str);
 738         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 739                        "\n\tdirname: %s\n", str);
 740         free(str);
 741     }
 742     free_AuthorityInfoAccessSyntax(&aia);
 743
 744     return 0;
 745 }
 746
 747 /*
 748  *
 749  */
 750
 751 struct {
 752     const char *name;
 753     const heim_oid *oid;
 754     int (*func)(hx509_validate_ctx ctx,
 755                 struct cert_status *status,
 756                 enum critical_flag cf,
 757                 const Extension *);
 758     enum critical_flag cf;
 759 } check_extension[] = {
 760 #define ext(name, checkname) #name, &asn1_oid_id_x509_ce_##name, check_##checkname
 761     { ext(subjectDirectoryAttributes, Null), M_N_C },
 762     { ext(subjectKeyIdentifier, subjectKeyIdentifier), M_N_C },
 763     { ext(keyUsage, Null), S_C },
 764     { ext(subjectAltName, subjectAltName), M_N_C },
 765     { ext(issuerAltName, issuerAltName), S_N_C },
 766     { ext(basicConstraints, basicConstraints), D_C },
 767     { ext(cRLNumber, Null), M_N_C },
 768     { ext(cRLReason, Null), M_N_C },
 769     { ext(holdInstructionCode, Null), M_N_C },
 770     { ext(invalidityDate, Null), M_N_C },
 771     { ext(deltaCRLIndicator, Null), M_C },
 772     { ext(issuingDistributionPoint, Null), M_C },
 773     { ext(certificateIssuer, Null), M_C },
 774     { ext(nameConstraints, Null), M_C },
 775     { ext(cRLDistributionPoints, CRLDistributionPoints), S_N_C },
 776     { ext(certificatePolicies, Null) },
 777     { ext(policyMappings, Null), M_N_C },
 778     { ext(authorityKeyIdentifier, authorityKeyIdentifier), M_N_C },
 779     { ext(policyConstraints, Null), D_C },
 780     { ext(extKeyUsage, extKeyUsage), D_C },
 781     { ext(freshestCRL, Null), M_N_C },
 782     { ext(inhibitAnyPolicy, Null), M_C },
 783 #undef ext
 784 #define ext(name, checkname) #name, &asn1_oid_id_pkix_pe_##name, check_##checkname
 785     { ext(proxyCertInfo, proxyCertInfo), M_C },
 786     { ext(authorityInfoAccess, authorityInfoAccess), M_C },
 787 #undef ext
 788     { "US Fed PKI - PIV Interim", &asn1_oid_id_uspkicommon_piv_interim,
 789       check_Null, D_C },
 790     { "Netscape cert comment", &asn1_oid_id_netscape_cert_comment,
 791       check_Null, D_C },
 792     { NULL }
 793 };
 794
 795 /**
 796  * Allocate a hx509 validation/printing context.
 797  *
 798  * @param context A hx509 context.
 799  * @param ctx a new allocated hx509 validation context, free with
 800  * hx509_validate_ctx_free().
 801
 802  * @return An hx509 error code, see hx509_get_error_string().
 803  *
 804  * @ingroup hx509_print
 805  */
 806
 807 int
 808 hx509_validate_ctx_init(hx509_context context, hx509_validate_ctx *ctx)
 809 {
 810     *ctx = malloc(sizeof(**ctx));
 811     if (*ctx == NULL)
 812         return ENOMEM;
 813     memset(*ctx, 0, sizeof(**ctx));
 814     return 0;
 815 }
 816
 817 /**
 818  * Set the printing functions for the validation context.
 819  *
 820  * @param ctx a hx509 valication context.
 821  * @param func the printing function to usea.
 822  * @param c the context variable to the printing function.
 823  *
 824  * @return An hx509 error code, see hx509_get_error_string().
 825  *
 826  * @ingroup hx509_print
 827  */
 828
 829 void
 830 hx509_validate_ctx_set_print(hx509_validate_ctx ctx,
 831                              hx509_vprint_func func,
 832                              void *c)
 833 {
 834     ctx->vprint_func = func;
 835     ctx->ctx = c;
 836 }
 837
 838 /**
 839  * Add flags to control the behaivor of the hx509_validate_cert()
 840  * function.
 841  *
 842  * @param ctx A hx509 validation context.
 843  * @param flags flags to add to the validation context.
 844  *
 845  * @return An hx509 error code, see hx509_get_error_string().
 846  *
 847  * @ingroup hx509_print
 848  */
 849
 850 void
 851 hx509_validate_ctx_add_flags(hx509_validate_ctx ctx, int flags)
 852 {
 853     ctx->flags |= flags;
 854 }
 855
 856 /**
 857  * Free an hx509 validate context.
 858  *
 859  * @param ctx the hx509 validate context to free.
 860  *
 861  * @ingroup hx509_print
 862  */
 863
 864 void
 865 hx509_validate_ctx_free(hx509_validate_ctx ctx)
 866 {
 867     free(ctx);
 868 }
 869
 870 /**
 871  * Validate/Print the status of the certificate.
 872  *
 873  * @param context A hx509 context.
 874  * @param ctx A hx509 validation context.
 875  * @param cert the cerificate to validate/print.
 876
 877  * @return An hx509 error code, see hx509_get_error_string().
 878  *
 879  * @ingroup hx509_print
 880  */
 881
 882 int
 883 hx509_validate_cert(hx509_context context,
 884                     hx509_validate_ctx ctx,
 885                     hx509_cert cert)
 886 {
 887     Certificate *c = _hx509_get_cert(cert);
 888     TBSCertificate *t = &c->tbsCertificate;
 889     hx509_name issuer, subject;
 890     char *str;
 891     struct cert_status status;
 892     int ret;
 893
 894     memset(&status, 0, sizeof(status));
 895
 896     if (_hx509_cert_get_version(c) != 3)
 897         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 898                        "Not version 3 certificate\n");
 899
 900     if ((t->version == NULL || *t->version < 2) && t->extensions)
 901         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 902                        "Not version 3 certificate with extensions\n");
 903
 904     if (_hx509_cert_get_version(c) >= 3 && t->extensions == NULL)
 905         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 906                        "Version 3 certificate without extensions\n");
 907
 908     ret = hx509_cert_get_subject(cert, &subject);
 909     if (ret) abort();
 910     hx509_name_to_string(subject, &str);
 911     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 912                    "subject name: %s\n", str);
 913     free(str);
 914
 915     ret = hx509_cert_get_issuer(cert, &issuer);
 916     if (ret) abort();
 917     hx509_name_to_string(issuer, &str);
 918     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 919                    "issuer name: %s\n", str);
 920     free(str);
 921
 922     if (hx509_name_cmp(subject, issuer) == 0) {
 923         status.selfsigned = 1;
 924         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 925                        "\tis a self-signed certificate\n");
 926     }
 927
 928     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 929                    "Validity:\n");
 930
 931     Time2string(&t->validity.notBefore, &str);
 932     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotBefore %s\n", str);
 933     free(str);
 934     Time2string(&t->validity.notAfter, &str);
 935     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotAfter  %s\n", str);
 936     free(str);
 937
 938     if (t->extensions) {
 939         int i, j;
 940
 941         if (t->extensions->len == 0) {
 942             validate_print(ctx,
 943                            HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
 944                            "The empty extensions list is not "
 945                            "allowed by PKIX\n");
 946         }
 947
 948         for (i = 0; i < t->extensions->len; i++) {
 949
 950             for (j = 0; check_extension[j].name; j++)
 951                 if (der_heim_oid_cmp(check_extension[j].oid,
 952                                      &t->extensions->val[i].extnID) == 0)
 953                     break;
 954             if (check_extension[j].name == NULL) {
 955                 int flags = HX509_VALIDATE_F_VERBOSE;
 956                 if (t->extensions->val[i].critical)
 957                     flags |= HX509_VALIDATE_F_VALIDATE;
 958                 validate_print(ctx, flags, "don't know what ");
 959                 if (t->extensions->val[i].critical)
 960                     validate_print(ctx, flags, "and is CRITICAL ");
 961                 if (ctx->flags & flags)
 962                     hx509_oid_print(&t->extensions->val[i].extnID,
 963                                     validate_vprint, ctx);
 964                 validate_print(ctx, flags, " is\n");
 965                 continue;
 966             }
 967             validate_print(ctx,
 968                            HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
 969                            "checking extention: %s\n",
 970                            check_extension[j].name);
 971             (*check_extension[j].func)(ctx,
 972                                        &status,
 973                                        check_extension[j].cf,
 974                                        &t->extensions->val[i]);
 975         }
 976     } else
 977         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "no extentions\n");
 978
 979     if (status.isca) {
 980         if (!status.haveSKI)
 981             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 982                            "CA certificate have no SubjectKeyIdentifier\n");
 983
 984     } else {
 985         if (!status.haveAKI)
 986             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 987                            "Is not CA and doesn't have "
 988                            "AuthorityKeyIdentifier\n");
 989     }
 990
 991
 992     if (!status.haveSKI)
 993         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 994                        "Doesn't have SubjectKeyIdentifier\n");
 995
 996     if (status.isproxy && status.isca)
 997         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 998                        "Proxy and CA at the same time!\n");
 999
1000     if (status.isproxy) {
1001         if (status.haveSAN)
1002             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1003                            "Proxy and have SAN\n");
1004         if (status.haveIAN)
1005             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1006                            "Proxy and have IAN\n");
1007     }
1008
1009     if (hx509_name_is_null_p(subject) && !status.haveSAN)
1010         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1011                        "NULL subject DN and doesn't have a SAN\n");
1012
1013     if (!status.selfsigned && !status.haveCRLDP)
1014         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1015                        "Not a CA nor PROXY and doesn't have"
1016                        "CRL Dist Point\n");
1017
1018     if (status.selfsigned) {
1019         ret = _hx509_verify_signature_bitstring(context,
1020                                                 cert,
1021                                                 &c->signatureAlgorithm,
1022                                                 &c->tbsCertificate._save,
1023                                                 &c->signatureValue);
1024         if (ret == 0)
1025             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
1026                            "Self-signed certificate was self-signed\n");
1027         else
1028             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
1029                            "Self-signed certificate NOT really self-signed!\n");
1030     }
1031
1032     hx509_name_free(&subject);
1033     hx509_name_free(&issuer);
1034
1035     return 0;
1036 }