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 RCSID("$Id$");
  36
  37 /**
  38  * @page page_print Hx509 printing functions
  39  *
  40  * See the library functions here: @ref hx509_print
  41  */
  42
  43 struct hx509_validate_ctx_data {
  44     int flags;
  45     hx509_vprint_func vprint_func;
  46     void *ctx;
  47 };
  48
  49 struct cert_status {
  50     unsigned int selfsigned:1;
  51     unsigned int isca:1;
  52     unsigned int isproxy:1;
  53     unsigned int haveSAN:1;
  54     unsigned int haveIAN:1;
  55     unsigned int haveSKI:1;
  56     unsigned int haveAKI:1;
  57     unsigned int haveCRLDP:1;
  58 };
  59
  60
  61 /*
  62  *
  63  */
  64
  65 static int
  66 Time2string(const Time *T, char **str)
  67 {
  68     time_t t;
  69     char *s;
  70     struct tm *tm;
  71
  72     *str = NULL;
  73     t = _hx509_Time2time_t(T);
  74     tm = gmtime (&t);
  75     s = malloc(30);
  76     if (s == NULL)
  77         return ENOMEM;
  78     strftime(s, 30, "%Y-%m-%d %H:%M:%S", tm);
  79     *str = s;
  80     return 0;
  81 }
  82
  83 /**
  84  * Helper function to print on stdout for:
  85  * - hx509_oid_print(),
  86  * - hx509_bitstring_print(),
  87  * - hx509_validate_ctx_set_print().
  88  *
  89  * @param ctx the context to the print function. If the ctx is NULL,
  90  * stdout is used.
  91  * @param fmt the printing format.
  92  * @param va the argumet list.
  93  *
  94  * @ingroup hx509_print
  95  */
  96
  97 void
  98 hx509_print_stdout(void *ctx, const char *fmt, va_list va)
  99 {
 100     FILE *f = ctx;
 101     if (f == NULL)
 102         f = stdout;
 103     vfprintf(f, fmt, va);
 104 }
 105
 106 static void
 107 print_func(hx509_vprint_func func, void *ctx, const char *fmt, ...)
 108 {
 109     va_list va;
 110     va_start(va, fmt);
 111     (*func)(ctx, fmt, va);
 112     va_end(va);
 113 }
 114
 115 /**
 116  * Print a oid to a string.
 117  *
 118  * @param oid oid to print
 119  * @param str allocated string, free with hx509_xfree().
 120  *
 121  * @return An hx509 error code, see hx509_get_error_string().
 122  *
 123  * @ingroup hx509_print
 124  */
 125
 126 int
 127 hx509_oid_sprint(const heim_oid *oid, char **str)
 128 {
 129     return der_print_heim_oid(oid, '.', str);
 130 }
 131
 132 /**
 133  * Print a oid using a hx509_vprint_func function. To print to stdout
 134  * use hx509_print_stdout().
 135  *
 136  * @param oid oid to print
 137  * @param func hx509_vprint_func to print with.
 138  * @param ctx context variable to hx509_vprint_func function.
 139  *
 140  * @ingroup hx509_print
 141  */
 142
 143 void
 144 hx509_oid_print(const heim_oid *oid, hx509_vprint_func func, void *ctx)
 145 {
 146     char *str;
 147     hx509_oid_sprint(oid, &str);
 148     print_func(func, ctx, "%s", str);
 149     free(str);
 150 }
 151
 152 /**
 153  * Print a bitstring using a hx509_vprint_func function. To print to
 154  * stdout use hx509_print_stdout().
 155  *
 156  * @param b bit string to print.
 157  * @param func hx509_vprint_func to print with.
 158  * @param ctx context variable to hx509_vprint_func function.
 159  *
 160  * @ingroup hx509_print
 161  */
 162
 163 void
 164 hx509_bitstring_print(const heim_bit_string *b,
 165                       hx509_vprint_func func, void *ctx)
 166 {
 167     int i;
 168     print_func(func, ctx, "\tlength: %d\n\t", b->length);
 169     for (i = 0; i < (b->length + 7) / 8; i++)
 170         print_func(func, ctx, "%02x%s%s",
 171                    ((unsigned char *)b->data)[i],
 172                    i < (b->length - 7) / 8
 173                    && (i == 0 || (i % 16) != 15) ? ":" : "",
 174                    i != 0 && (i % 16) == 15 ?
 175                    (i <= ((b->length + 7) / 8 - 2) ? "\n\t" : "\n"):"");
 176 }
 177
 178 /**
 179  * Print certificate usage for a certificate to a string.
 180  *
 181  * @param context A hx509 context.
 182  * @param c a certificate print the keyusage for.
 183  * @param s the return string with the keysage printed in to, free
 184  * with hx509_xfree().
 185  *
 186  * @return An hx509 error code, see hx509_get_error_string().
 187  *
 188  * @ingroup hx509_print
 189  */
 190
 191 int
 192 hx509_cert_keyusage_print(hx509_context context, hx509_cert c, char **s)
 193 {
 194     KeyUsage ku;
 195     char buf[256];
 196     int ret;
 197
 198     *s = NULL;
 199
 200     ret = _hx509_cert_get_keyusage(context, c, &ku);
 201     if (ret)
 202         return ret;
 203     unparse_flags(KeyUsage2int(ku), asn1_KeyUsage_units(), buf, sizeof(buf));
 204     *s = strdup(buf);
 205     if (*s == NULL) {
 206         hx509_set_error_string(context, 0, ENOMEM, "out of memory");
 207         return ENOMEM;
 208     }
 209
 210     return 0;
 211 }
 212
 213 /*
 214  *
 215  */
 216
 217 static void
 218 validate_vprint(void *c, const char *fmt, va_list va)
 219 {
 220     hx509_validate_ctx ctx = c;
 221     if (ctx->vprint_func == NULL)
 222         return;
 223     (ctx->vprint_func)(ctx->ctx, fmt, va);
 224 }
 225
 226 static void
 227 validate_print(hx509_validate_ctx ctx, int flags, const char *fmt, ...)
 228 {
 229     va_list va;
 230     if ((ctx->flags & flags) == 0)
 231         return;
 232     va_start(va, fmt);
 233     validate_vprint(ctx, fmt, va);
 234     va_end(va);
 235 }
 236
 237 /*
 238  * Dont Care, SHOULD critical, SHOULD NOT critical, MUST critical,
 239  * MUST NOT critical
 240  */
 241 enum critical_flag { D_C = 0, S_C, S_N_C, M_C, M_N_C };
 242
 243 static int
 244 check_Null(hx509_validate_ctx ctx,
 245            struct cert_status *status,
 246            enum critical_flag cf, const Extension *e)
 247 {
 248     switch(cf) {
 249     case D_C:
 250         break;
 251     case S_C:
 252         if (!e->critical)
 253             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 254                            "\tCritical not set on SHOULD\n");
 255         break;
 256     case S_N_C:
 257         if (e->critical)
 258             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 259                            "\tCritical set on SHOULD NOT\n");
 260         break;
 261     case M_C:
 262         if (!e->critical)
 263             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 264                            "\tCritical not set on MUST\n");
 265         break;
 266     case M_N_C:
 267         if (e->critical)
 268             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 269                            "\tCritical set on MUST NOT\n");
 270         break;
 271     default:
 272         _hx509_abort("internal check_Null state error");
 273     }
 274     return 0;
 275 }
 276
 277 static int
 278 check_subjectKeyIdentifier(hx509_validate_ctx ctx,
 279                            struct cert_status *status,
 280                            enum critical_flag cf,
 281                            const Extension *e)
 282 {
 283     SubjectKeyIdentifier si;
 284     size_t size;
 285     int ret;
 286
 287     status->haveSKI = 1;
 288     check_Null(ctx, status, cf, e);
 289
 290     ret = decode_SubjectKeyIdentifier(e->extnValue.data,
 291                                       e->extnValue.length,
 292                                       &si, &size);
 293     if (ret) {
 294         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 295                        "Decoding SubjectKeyIdentifier failed: %d", ret);
 296         return 1;
 297     }
 298     if (size != e->extnValue.length) {
 299         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 300                        "Decoding SKI ahve extra bits on the end");
 301         return 1;
 302     }
 303     if (si.length == 0)
 304         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 305                        "SKI is too short (0 bytes)");
 306     if (si.length > 20)
 307         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 308                        "SKI is too long");
 309
 310     {
 311         char *id;
 312         hex_encode(si.data, si.length, &id);
 313         if (id) {
 314             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 315                            "\tsubject key id: %s\n", id);
 316             free(id);
 317         }
 318     }
 319
 320     free_SubjectKeyIdentifier(&si);
 321
 322     return 0;
 323 }
 324
 325 static int
 326 check_authorityKeyIdentifier(hx509_validate_ctx ctx,
 327                              struct cert_status *status,
 328                              enum critical_flag cf,
 329                              const Extension *e)
 330 {
 331     AuthorityKeyIdentifier ai;
 332     size_t size;
 333     int ret;
 334
 335     status->haveAKI = 1;
 336     check_Null(ctx, status, cf, e);
 337
 338     status->haveSKI = 1;
 339     check_Null(ctx, status, cf, e);
 340
 341     ret = decode_AuthorityKeyIdentifier(e->extnValue.data,
 342                                         e->extnValue.length,
 343                                         &ai, &size);
 344     if (ret) {
 345         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 346                        "Decoding AuthorityKeyIdentifier failed: %d", ret);
 347         return 1;
 348     }
 349     if (size != e->extnValue.length) {
 350         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 351                        "Decoding SKI ahve extra bits on the end");
 352         return 1;
 353     }
 354
 355     if (ai.keyIdentifier) {
 356         char *id;
 357         hex_encode(ai.keyIdentifier->data, ai.keyIdentifier->length, &id);
 358         if (id) {
 359             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 360                            "\tauthority key id: %s\n", id);
 361             free(id);
 362         }
 363     }
 364
 365     return 0;
 366 }
 367
 368
 369 static int
 370 check_pkinit_san(hx509_validate_ctx ctx, heim_any *a)
 371 {
 372     KRB5PrincipalName kn;
 373     unsigned i;
 374     size_t size;
 375     int ret;
 376
 377     ret = decode_KRB5PrincipalName(a->data, a->length, &kn, &size);
 378     if (ret) {
 379         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 380                        "Decoding kerberos name in SAN failed: %d", ret);
 381         return 1;
 382     }
 383
 384     if (size != a->length) {
 385         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 386                        "Decoding kerberos name have extra bits on the end");
 387         return 1;
 388     }
 389
 390     /* print kerberos principal, add code to quote / within components */
 391     for (i = 0; i < kn.principalName.name_string.len; i++) {
 392         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s",
 393                        kn.principalName.name_string.val[i]);
 394         if (i + 1 < kn.principalName.name_string.len)
 395             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "/");
 396     }
 397     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "@");
 398     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", kn.realm);
 399
 400     free_KRB5PrincipalName(&kn);
 401     return 0;
 402 }
 403
 404 static int
 405 check_utf8_string_san(hx509_validate_ctx ctx, heim_any *a)
 406 {
 407     PKIXXmppAddr jid;
 408     size_t size;
 409     int ret;
 410
 411     ret = decode_PKIXXmppAddr(a->data, a->length, &jid, &size);
 412     if (ret) {
 413         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 414                        "Decoding JID in SAN failed: %d", ret);
 415         return 1;
 416     }
 417
 418     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s", jid);
 419     free_PKIXXmppAddr(&jid);
 420
 421     return 0;
 422 }
 423
 424 static int
 425 check_altnull(hx509_validate_ctx ctx, heim_any *a)
 426 {
 427     return 0;
 428 }
 429
 430 static int
 431 check_CRLDistributionPoints(hx509_validate_ctx ctx,
 432                            struct cert_status *status,
 433                            enum critical_flag cf,
 434                            const Extension *e)
 435 {
 436     CRLDistributionPoints dp;
 437     size_t size;
 438     int ret, i;
 439
 440     check_Null(ctx, status, cf, e);
 441
 442     ret = decode_CRLDistributionPoints(e->extnValue.data,
 443                                        e->extnValue.length,
 444                                        &dp, &size);
 445     if (ret) {
 446         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 447                        "Decoding CRL Distribution Points failed: %d\n", ret);
 448         return 1;
 449     }
 450
 451     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "CRL Distribution Points:\n");
 452     for (i = 0 ; i < dp.len; i++) {
 453         if (dp.val[i].distributionPoint) {
 454             DistributionPointName dpname;
 455             heim_any *data = dp.val[i].distributionPoint;
 456             int j;
 457
 458             ret = decode_DistributionPointName(data->data, data->length,
 459                                                &dpname, NULL);
 460             if (ret) {
 461                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 462                                "Failed to parse CRL Distribution Point Name: %d\n", ret);
 463                 continue;
 464             }
 465
 466             switch (dpname.element) {
 467             case choice_DistributionPointName_fullName:
 468                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "Fullname:\n");
 469
 470                 for (j = 0 ; j < dpname.u.fullName.len; j++) {
 471                     char *s;
 472                     GeneralName *name = &dpname.u.fullName.val[j];
 473
 474                     ret = hx509_general_name_unparse(name, &s);
 475                     if (ret == 0 && s != NULL) {
 476                         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "   %s\n", s);
 477                         free(s);
 478                     }
 479                 }
 480                 break;
 481             case choice_DistributionPointName_nameRelativeToCRLIssuer:
 482                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 483                                "Unknown nameRelativeToCRLIssuer");
 484                 break;
 485             default:
 486                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 487                                "Unknown DistributionPointName");
 488                 break;
 489             }
 490             free_DistributionPointName(&dpname);
 491         }
 492     }
 493     free_CRLDistributionPoints(&dp);
 494
 495     status->haveCRLDP = 1;
 496
 497     return 0;
 498 }
 499
 500
 501 struct {
 502     const char *name;
 503     const heim_oid *(*oid)(void);
 504     int (*func)(hx509_validate_ctx, heim_any *);
 505 } check_altname[] = {
 506     { "pk-init", oid_id_pkinit_san, check_pkinit_san },
 507     { "jabber", oid_id_pkix_on_xmppAddr, check_utf8_string_san },
 508     { "dns-srv", oid_id_pkix_on_dnsSRV, check_altnull },
 509     { "card-id", oid_id_uspkicommon_card_id, check_altnull },
 510     { "Microsoft NT-PRINCIPAL-NAME", oid_id_pkinit_ms_san, check_utf8_string_san }
 511 };
 512
 513 static int
 514 check_altName(hx509_validate_ctx ctx,
 515               struct cert_status *status,
 516               const char *name,
 517               enum critical_flag cf,
 518               const Extension *e)
 519 {
 520     GeneralNames gn;
 521     size_t size;
 522     int ret, i;
 523
 524     check_Null(ctx, status, cf, e);
 525
 526     if (e->extnValue.length == 0) {
 527         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 528                        "%sAltName empty, not allowed", name);
 529         return 1;
 530     }
 531     ret = decode_GeneralNames(e->extnValue.data, e->extnValue.length,
 532                               &gn, &size);
 533     if (ret) {
 534         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 535                        "\tret = %d while decoding %s GeneralNames\n",
 536                        ret, name);
 537         return 1;
 538     }
 539     if (gn.len == 0) {
 540         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 541                        "%sAltName generalName empty, not allowed\n", name);
 542         return 1;
 543     }
 544
 545     for (i = 0; i < gn.len; i++) {
 546         switch (gn.val[i].element) {
 547         case choice_GeneralName_otherName: {
 548             unsigned j;
 549
 550             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 551                            "%sAltName otherName ", name);
 552
 553             for (j = 0; j < sizeof(check_altname)/sizeof(check_altname[0]); j++) {
 554                 if (der_heim_oid_cmp((*check_altname[j].oid)(),
 555                                      &gn.val[i].u.otherName.type_id) != 0)
 556                     continue;
 557
 558                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s: ",
 559                                check_altname[j].name);
 560                 (*check_altname[j].func)(ctx, &gn.val[i].u.otherName.value);
 561                 break;
 562             }
 563             if (j == sizeof(check_altname)/sizeof(check_altname[0])) {
 564                 hx509_oid_print(&gn.val[i].u.otherName.type_id,
 565                                 validate_vprint, ctx);
 566                 validate_print(ctx, HX509_VALIDATE_F_VERBOSE, " unknown");
 567             }
 568             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\n");
 569             break;
 570         }
 571         default: {
 572             char *s;
 573             ret = hx509_general_name_unparse(&gn.val[i], &s);
 574             if (ret) {
 575                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 576                                "ret = %d unparsing GeneralName\n", ret);
 577                 return 1;
 578             }
 579             validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "%s\n", s);
 580             free(s);
 581             break;
 582         }
 583         }
 584     }
 585
 586     free_GeneralNames(&gn);
 587
 588     return 0;
 589 }
 590
 591 static int
 592 check_subjectAltName(hx509_validate_ctx ctx,
 593                      struct cert_status *status,
 594                      enum critical_flag cf,
 595                      const Extension *e)
 596 {
 597     status->haveSAN = 1;
 598     return check_altName(ctx, status, "subject", cf, e);
 599 }
 600
 601 static int
 602 check_issuerAltName(hx509_validate_ctx ctx,
 603                     struct cert_status *status,
 604                      enum critical_flag cf,
 605                      const Extension *e)
 606 {
 607     status->haveIAN = 1;
 608     return check_altName(ctx, status, "issuer", cf, e);
 609 }
 610
 611
 612 static int
 613 check_basicConstraints(hx509_validate_ctx ctx,
 614                        struct cert_status *status,
 615                        enum critical_flag cf,
 616                        const Extension *e)
 617 {
 618     BasicConstraints b;
 619     size_t size;
 620     int ret;
 621
 622     check_Null(ctx, status, cf, e);
 623
 624     ret = decode_BasicConstraints(e->extnValue.data, e->extnValue.length,
 625                                   &b, &size);
 626     if (ret) {
 627         printf("\tret = %d while decoding BasicConstraints\n", ret);
 628         return 0;
 629     }
 630     if (size != e->extnValue.length)
 631         printf("\tlength of der data isn't same as extension\n");
 632
 633     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 634                    "\tis %sa CA\n", b.cA && *b.cA ? "" : "NOT ");
 635     if (b.pathLenConstraint)
 636         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 637                        "\tpathLenConstraint: %d\n", *b.pathLenConstraint);
 638
 639     if (b.cA) {
 640         if (*b.cA) {
 641             if (!e->critical)
 642                 validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 643                                "Is a CA and not BasicConstraints CRITICAL\n");
 644             status->isca = 1;
 645         }
 646         else
 647             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 648                            "cA is FALSE, not allowed to be\n");
 649     }
 650     free_BasicConstraints(&b);
 651
 652     return 0;
 653 }
 654
 655 static int
 656 check_proxyCertInfo(hx509_validate_ctx ctx,
 657                     struct cert_status *status,
 658                     enum critical_flag cf,
 659                     const Extension *e)
 660 {
 661     check_Null(ctx, status, cf, e);
 662     status->isproxy = 1;
 663     return 0;
 664 }
 665
 666 static int
 667 check_authorityInfoAccess(hx509_validate_ctx ctx,
 668                           struct cert_status *status,
 669                           enum critical_flag cf,
 670                           const Extension *e)
 671 {
 672     AuthorityInfoAccessSyntax aia;
 673     size_t size;
 674     int ret, i;
 675
 676     check_Null(ctx, status, cf, e);
 677
 678     ret = decode_AuthorityInfoAccessSyntax(e->extnValue.data,
 679                                            e->extnValue.length,
 680                                            &aia, &size);
 681     if (ret) {
 682         printf("\tret = %d while decoding AuthorityInfoAccessSyntax\n", ret);
 683         return 0;
 684     }
 685
 686     for (i = 0; i < aia.len; i++) {
 687         char *str;
 688         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 689                        "\ttype: ");
 690         hx509_oid_print(&aia.val[i].accessMethod, validate_vprint, ctx);
 691         hx509_general_name_unparse(&aia.val[i].accessLocation, &str);
 692         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 693                        "\n\tdirname: %s\n", str);
 694         free(str);
 695     }
 696     free_AuthorityInfoAccessSyntax(&aia);
 697
 698     return 0;
 699 }
 700
 701 /*
 702  *
 703  */
 704
 705 struct {
 706     const char *name;
 707     const heim_oid *(*oid)(void);
 708     int (*func)(hx509_validate_ctx ctx,
 709                 struct cert_status *status,
 710                 enum critical_flag cf,
 711                 const Extension *);
 712     enum critical_flag cf;
 713 } check_extension[] = {
 714 #define ext(name, checkname) #name, &oid_id_x509_ce_##name, check_##checkname
 715     { ext(subjectDirectoryAttributes, Null), M_N_C },
 716     { ext(subjectKeyIdentifier, subjectKeyIdentifier), M_N_C },
 717     { ext(keyUsage, Null), S_C },
 718     { ext(subjectAltName, subjectAltName), M_N_C },
 719     { ext(issuerAltName, issuerAltName), S_N_C },
 720     { ext(basicConstraints, basicConstraints), D_C },
 721     { ext(cRLNumber, Null), M_N_C },
 722     { ext(cRLReason, Null), M_N_C },
 723     { ext(holdInstructionCode, Null), M_N_C },
 724     { ext(invalidityDate, Null), M_N_C },
 725     { ext(deltaCRLIndicator, Null), M_C },
 726     { ext(issuingDistributionPoint, Null), M_C },
 727     { ext(certificateIssuer, Null), M_C },
 728     { ext(nameConstraints, Null), M_C },
 729     { ext(cRLDistributionPoints, CRLDistributionPoints), S_N_C },
 730     { ext(certificatePolicies, Null) },
 731     { ext(policyMappings, Null), M_N_C },
 732     { ext(authorityKeyIdentifier, authorityKeyIdentifier), M_N_C },
 733     { ext(policyConstraints, Null), D_C },
 734     { ext(extKeyUsage, Null), D_C },
 735     { ext(freshestCRL, Null), M_N_C },
 736     { ext(inhibitAnyPolicy, Null), M_C },
 737 #undef ext
 738 #define ext(name, checkname) #name, &oid_id_pkix_pe_##name, check_##checkname
 739     { ext(proxyCertInfo, proxyCertInfo), M_C },
 740     { ext(authorityInfoAccess, authorityInfoAccess), M_C },
 741 #undef ext
 742     { "US Fed PKI - PIV Interim", oid_id_uspkicommon_piv_interim,
 743       check_Null, D_C },
 744     { "Netscape cert comment", oid_id_netscape_cert_comment,
 745       check_Null, D_C },
 746     { NULL }
 747 };
 748
 749 /**
 750  * Allocate a hx509 validation/printing context.
 751  *
 752  * @param context A hx509 context.
 753  * @param ctx a new allocated hx509 validation context, free with
 754  * hx509_validate_ctx_free().
 755
 756  * @return An hx509 error code, see hx509_get_error_string().
 757  *
 758  * @ingroup hx509_print
 759  */
 760
 761 int
 762 hx509_validate_ctx_init(hx509_context context, hx509_validate_ctx *ctx)
 763 {
 764     *ctx = malloc(sizeof(**ctx));
 765     if (*ctx == NULL)
 766         return ENOMEM;
 767     memset(*ctx, 0, sizeof(**ctx));
 768     return 0;
 769 }
 770
 771 /**
 772  * Set the printing functions for the validation context.
 773  *
 774  * @param ctx a hx509 valication context.
 775  * @param func the printing function to usea.
 776  * @param c the context variable to the printing function.
 777  *
 778  * @return An hx509 error code, see hx509_get_error_string().
 779  *
 780  * @ingroup hx509_print
 781  */
 782
 783 void
 784 hx509_validate_ctx_set_print(hx509_validate_ctx ctx,
 785                              hx509_vprint_func func,
 786                              void *c)
 787 {
 788     ctx->vprint_func = func;
 789     ctx->ctx = c;
 790 }
 791
 792 /**
 793  * Add flags to control the behaivor of the hx509_validate_cert()
 794  * function.
 795  *
 796  * @param ctx A hx509 validation context.
 797  * @param flags flags to add to the validation context.
 798  *
 799  * @return An hx509 error code, see hx509_get_error_string().
 800  *
 801  * @ingroup hx509_print
 802  */
 803
 804 void
 805 hx509_validate_ctx_add_flags(hx509_validate_ctx ctx, int flags)
 806 {
 807     ctx->flags |= flags;
 808 }
 809
 810 /**
 811  * Free an hx509 validate context.
 812  *
 813  * @param ctx the hx509 validate context to free.
 814  *
 815  * @ingroup hx509_print
 816  */
 817
 818 void
 819 hx509_validate_ctx_free(hx509_validate_ctx ctx)
 820 {
 821     free(ctx);
 822 }
 823
 824 /**
 825  * Validate/Print the status of the certificate.
 826  *
 827  * @param context A hx509 context.
 828  * @param ctx A hx509 validation context.
 829  * @param cert the cerificate to validate/print.
 830
 831  * @return An hx509 error code, see hx509_get_error_string().
 832  *
 833  * @ingroup hx509_print
 834  */
 835
 836 int
 837 hx509_validate_cert(hx509_context context,
 838                     hx509_validate_ctx ctx,
 839                     hx509_cert cert)
 840 {
 841     Certificate *c = _hx509_get_cert(cert);
 842     TBSCertificate *t = &c->tbsCertificate;
 843     hx509_name issuer, subject;
 844     char *str;
 845     struct cert_status status;
 846     int ret;
 847
 848     memset(&status, 0, sizeof(status));
 849
 850     if (_hx509_cert_get_version(c) != 3)
 851         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 852                        "Not version 3 certificate\n");
 853
 854     if ((t->version == NULL || *t->version < 2) && t->extensions)
 855         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 856                        "Not version 3 certificate with extensions\n");
 857
 858     if (_hx509_cert_get_version(c) >= 3 && t->extensions == NULL)
 859         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 860                        "Version 3 certificate without extensions\n");
 861
 862     ret = hx509_cert_get_subject(cert, &subject);
 863     if (ret) abort();
 864     hx509_name_to_string(subject, &str);
 865     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 866                    "subject name: %s\n", str);
 867     free(str);
 868
 869     ret = hx509_cert_get_issuer(cert, &issuer);
 870     if (ret) abort();
 871     hx509_name_to_string(issuer, &str);
 872     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 873                    "issuer name: %s\n", str);
 874     free(str);
 875
 876     if (hx509_name_cmp(subject, issuer) == 0) {
 877         status.selfsigned = 1;
 878         validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 879                        "\tis a self-signed certificate\n");
 880     }
 881
 882     validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 883                    "Validity:\n");
 884
 885     Time2string(&t->validity.notBefore, &str);
 886     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotBefore %s\n", str);
 887     free(str);
 888     Time2string(&t->validity.notAfter, &str);
 889     validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "\tnotAfter  %s\n", str);
 890     free(str);
 891
 892     if (t->extensions) {
 893         int i, j;
 894
 895         if (t->extensions->len == 0) {
 896             validate_print(ctx,
 897                            HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
 898                            "The empty extensions list is not "
 899                            "allowed by PKIX\n");
 900         }
 901
 902         for (i = 0; i < t->extensions->len; i++) {
 903
 904             for (j = 0; check_extension[j].name; j++)
 905                 if (der_heim_oid_cmp((*check_extension[j].oid)(),
 906                                      &t->extensions->val[i].extnID) == 0)
 907                     break;
 908             if (check_extension[j].name == NULL) {
 909                 int flags = HX509_VALIDATE_F_VERBOSE;
 910                 if (t->extensions->val[i].critical)
 911                     flags |= HX509_VALIDATE_F_VALIDATE;
 912                 validate_print(ctx, flags, "don't know what ");
 913                 if (t->extensions->val[i].critical)
 914                     validate_print(ctx, flags, "and is CRITICAL ");
 915                 if (ctx->flags & flags)
 916                     hx509_oid_print(&t->extensions->val[i].extnID,
 917                                     validate_vprint, ctx);
 918                 validate_print(ctx, flags, " is\n");
 919                 continue;
 920             }
 921             validate_print(ctx,
 922                            HX509_VALIDATE_F_VALIDATE|HX509_VALIDATE_F_VERBOSE,
 923                            "checking extention: %s\n",
 924                            check_extension[j].name);
 925             (*check_extension[j].func)(ctx,
 926                                        &status,
 927                                        check_extension[j].cf,
 928                                        &t->extensions->val[i]);
 929         }
 930     } else
 931         validate_print(ctx, HX509_VALIDATE_F_VERBOSE, "no extentions\n");
 932
 933     if (status.isca) {
 934         if (!status.haveSKI)
 935             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 936                            "CA certificate have no SubjectKeyIdentifier\n");
 937
 938     } else {
 939         if (!status.haveAKI)
 940             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 941                            "Is not CA and doesn't have "
 942                            "AuthorityKeyIdentifier\n");
 943     }
 944
 945
 946     if (!status.haveSKI)
 947         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 948                        "Doesn't have SubjectKeyIdentifier\n");
 949
 950     if (status.isproxy && status.isca)
 951         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 952                        "Proxy and CA at the same time!\n");
 953
 954     if (status.isproxy) {
 955         if (status.haveSAN)
 956             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 957                            "Proxy and have SAN\n");
 958         if (status.haveIAN)
 959             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 960                            "Proxy and have IAN\n");
 961     }
 962
 963     if (hx509_name_is_null_p(subject) && !status.haveSAN)
 964         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 965                        "NULL subject DN and doesn't have a SAN\n");
 966
 967     if (!status.selfsigned && !status.haveCRLDP)
 968         validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 969                        "Not a CA nor PROXY and doesn't have"
 970                        "CRL Dist Point\n");
 971
 972     if (status.selfsigned) {
 973         ret = _hx509_verify_signature_bitstring(context,
 974                                                 c,
 975                                                 &c->signatureAlgorithm,
 976                                                 &c->tbsCertificate._save,
 977                                                 &c->signatureValue);
 978         if (ret == 0)
 979             validate_print(ctx, HX509_VALIDATE_F_VERBOSE,
 980                            "Self-signed certificate was self-signed\n");
 981         else
 982             validate_print(ctx, HX509_VALIDATE_F_VALIDATE,
 983                            "Self-signed certificate NOT really self-signed!\n");
 984     }
 985
 986     hx509_name_free(&subject);
 987     hx509_name_free(&issuer);
 988
 989     return 0;
 990 }