apps/x509.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include "apps.h"
  14 #include "progs.h"
  15 #include <openssl/bio.h>
  16 #include <openssl/asn1.h>
  17 #include <openssl/err.h>
  18 #include <openssl/bn.h>
  19 #include <openssl/evp.h>
  20 #include <openssl/x509.h>
  21 #include <openssl/x509v3.h>
  22 #include <openssl/objects.h>
  23 #include <openssl/pem.h>
  24 #include <openssl/rsa.h>
  25 #ifndef OPENSSL_NO_DSA
  26 # include <openssl/dsa.h>
  27 #endif
  28
  29 #undef POSTFIX
  30 #define POSTFIX ".srl"
  31 #define DEF_DAYS        30
  32
  33 static int callb(int ok, X509_STORE_CTX *ctx);
  34 static int sign(X509 *x, EVP_PKEY *pkey, X509 *issuer,
  35                 STACK_OF(OPENSSL_STRING) *sigopts,
  36                 int days, int clrext,
  37                 const EVP_MD *digest, CONF *conf, const char *section,
  38                 int preserve_dates);
  39 static int x509_certify(X509_STORE *ctx, const char *CAfile, const EVP_MD *digest,
  40                         X509 *x, X509 *xca, EVP_PKEY *pkey,
  41                         STACK_OF(OPENSSL_STRING) *sigopts, const char *serialfile,
  42                         int create, int days, int clrext, CONF *conf,
  43                         const char *section, ASN1_INTEGER *sno, int reqfile,
  44                         int preserve_dates);
  45 static int purpose_print(BIO *bio, X509 *cert, X509_PURPOSE *pt);
  46 static int print_x509v3_exts(BIO *bio, X509 *x, const char *exts);
  47
  48 typedef enum OPTION_choice {
  49     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  50     OPT_INFORM, OPT_OUTFORM, OPT_KEYFORM, OPT_REQ, OPT_CAFORM,
  51     OPT_CAKEYFORM, OPT_VFYOPT, OPT_SIGOPT, OPT_DAYS, OPT_PASSIN, OPT_EXTFILE,
  52     OPT_EXTENSIONS, OPT_IN, OPT_OUT, OPT_SIGNKEY, OPT_CA, OPT_CAKEY,
  53     OPT_CASERIAL, OPT_SET_SERIAL, OPT_NEW, OPT_FORCE_PUBKEY, OPT_SUBJ,
  54     OPT_ADDTRUST, OPT_ADDREJECT, OPT_SETALIAS, OPT_CERTOPT, OPT_NAMEOPT,
  55     OPT_EMAIL, OPT_OCSP_URI, OPT_SERIAL, OPT_NEXT_SERIAL,
  56     OPT_MODULUS, OPT_PUBKEY, OPT_X509TOREQ, OPT_TEXT, OPT_HASH,
  57     OPT_ISSUER_HASH, OPT_SUBJECT, OPT_ISSUER, OPT_FINGERPRINT, OPT_DATES,
  58     OPT_PURPOSE, OPT_STARTDATE, OPT_ENDDATE, OPT_CHECKEND, OPT_CHECKHOST,
  59     OPT_CHECKEMAIL, OPT_CHECKIP, OPT_NOOUT, OPT_TRUSTOUT, OPT_CLRTRUST,
  60     OPT_CLRREJECT, OPT_ALIAS, OPT_CACREATESERIAL, OPT_CLREXT, OPT_OCSPID,
  61     OPT_SUBJECT_HASH_OLD,
  62     OPT_ISSUER_HASH_OLD,
  63     OPT_BADSIG, OPT_MD, OPT_ENGINE, OPT_NOCERT, OPT_PRESERVE_DATES,
  64     OPT_R_ENUM, OPT_PROV_ENUM, OPT_EXT
  65 } OPTION_CHOICE;
  66
  67 const OPTIONS x509_options[] = {
  68     OPT_SECTION("General"),
  69     {"help", OPT_HELP, '-', "Display this summary"},
  70 #ifndef OPENSSL_NO_ENGINE
  71     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  72 #endif
  73
  74     {"inform", OPT_INFORM, 'f',
  75      "CSR input format (DER or PEM) - default PEM"},
  76     {"in", OPT_IN, '<', "Input file - default stdin"},
  77     {"passin", OPT_PASSIN, 's', "Private key and cert file pass-phrase source"},
  78     {"outform", OPT_OUTFORM, 'f',
  79      "Output format (DER or PEM) - default PEM"},
  80     {"out", OPT_OUT, '>', "Output file - default stdout"},
  81     {"keyform", OPT_KEYFORM, 'E', "Private key format (ENGINE, other values ignored)"},
  82     {"req", OPT_REQ, '-', "Input is a certificate request, sign and output"},
  83     {"vfyopt", OPT_VFYOPT, 's', "Verification parameter in n:v form"},
  84
  85     OPT_SECTION("Output"),
  86     {"serial", OPT_SERIAL, '-', "Print serial number value"},
  87     {"subject_hash", OPT_HASH, '-', "Print subject hash value"},
  88     {"issuer_hash", OPT_ISSUER_HASH, '-', "Print issuer hash value"},
  89     {"hash", OPT_HASH, '-', "Synonym for -subject_hash"},
  90     {"subject", OPT_SUBJECT, '-', "Print subject DN"},
  91     {"issuer", OPT_ISSUER, '-', "Print issuer DN"},
  92     {"email", OPT_EMAIL, '-', "Print email address(es)"},
  93     {"purpose", OPT_PURPOSE, '-', "Print out certificate purposes"},
  94     {"modulus", OPT_MODULUS, '-', "Print the RSA key modulus"},
  95     {"pubkey", OPT_PUBKEY, '-', "Output the public key"},
  96     {"fingerprint", OPT_FINGERPRINT, '-', "Print the certificate fingerprint"},
  97     {"alias", OPT_ALIAS, '-', "Output certificate alias"},
  98     {"noout", OPT_NOOUT, '-', "No output, just status"},
  99     {"ocspid", OPT_OCSPID, '-',
 100      "Print OCSP hash values for the subject name and public key"},
 101     {"ocsp_uri", OPT_OCSP_URI, '-', "Print OCSP Responder URL(s)"},
 102     {"nocert", OPT_NOCERT, '-', "No certificate output"},
 103     {"trustout", OPT_TRUSTOUT, '-', "Output a trusted certificate"},
 104     {"x509toreq", OPT_X509TOREQ, '-',
 105      "Output a certification request object"},
 106     {"checkend", OPT_CHECKEND, 'M',
 107      "Check whether the cert expires in the next arg seconds"},
 108     {OPT_MORE_STR, 1, 1, "Exit 1 if so, 0 if not"},
 109     {"text", OPT_TEXT, '-', "Print the certificate in text form"},
 110     {"ext", OPT_EXT, 's', "Print various X509V3 extensions"},
 111 #ifndef OPENSSL_NO_MD5
 112     {"subject_hash_old", OPT_SUBJECT_HASH_OLD, '-',
 113      "Print old-style (MD5) subject hash value"},
 114     {"issuer_hash_old", OPT_ISSUER_HASH_OLD, '-',
 115      "Print old-style (MD5) issuer hash value"},
 116 #endif
 117     {"nameopt", OPT_NAMEOPT, 's', "Certificate subject/issuer name printing options"},
 118
 119     OPT_SECTION("Certificate"),
 120     {"startdate", OPT_STARTDATE, '-', "Set notBefore field"},
 121     {"enddate", OPT_ENDDATE, '-', "Set notAfter field"},
 122     {"dates", OPT_DATES, '-', "Both Before and After dates"},
 123     {"clrtrust", OPT_CLRTRUST, '-', "Clear all trusted purposes"},
 124     {"clrext", OPT_CLREXT, '-', "Clear all certificate extensions"},
 125     {"addtrust", OPT_ADDTRUST, 's', "Trust certificate for a given purpose"},
 126     {"addreject", OPT_ADDREJECT, 's',
 127      "Reject certificate for a given purpose"},
 128     {"setalias", OPT_SETALIAS, 's', "Set certificate alias"},
 129     {"days", OPT_DAYS, 'n',
 130      "How long till expiry of a signed certificate - def 30 days"},
 131     {"signkey", OPT_SIGNKEY, 's', "Self-sign cert with arg"},
 132     {"set_serial", OPT_SET_SERIAL, 's', "Serial number to use"},
 133     {"extensions", OPT_EXTENSIONS, 's', "Section from config file to use"},
 134     {"certopt", OPT_CERTOPT, 's', "Various certificate text options"},
 135     {"checkhost", OPT_CHECKHOST, 's', "Check certificate matches host"},
 136     {"checkemail", OPT_CHECKEMAIL, 's', "Check certificate matches email"},
 137     {"checkip", OPT_CHECKIP, 's', "Check certificate matches ipaddr"},
 138     {"force_pubkey", OPT_FORCE_PUBKEY, '<', "Force the key to put inside certificate"},
 139     {"subj", OPT_SUBJ, 's', "Set or override certificate subject (and issuer)"},
 140
 141     OPT_SECTION("CA"),
 142     {"CA", OPT_CA, '<', "Set the CA certificate, must be PEM format"},
 143     {"CAkey", OPT_CAKEY, 's',
 144      "The CA key, must be PEM format; if not in CAfile"},
 145     {"extfile", OPT_EXTFILE, '<', "File with X509V3 extensions to add"},
 146     OPT_R_OPTIONS,
 147     OPT_PROV_OPTIONS,
 148     {"CAform", OPT_CAFORM, 'F', "CA cert format (PEM/DER/P12); has no effect"},
 149     {"CAkeyform", OPT_CAKEYFORM, 'E', "CA key format (ENGINE, other values ignored)"},
 150     {"sigopt", OPT_SIGOPT, 's', "Signature parameter in n:v form"},
 151     {"CAcreateserial", OPT_CACREATESERIAL, '-',
 152      "Create serial number file if it does not exist"},
 153     {"CAserial", OPT_CASERIAL, 's', "Serial file"},
 154     {"new", OPT_NEW, '-', "Generate a certificate from scratch"},
 155     {"next_serial", OPT_NEXT_SERIAL, '-', "Increment current certificate serial number"},
 156     {"clrreject", OPT_CLRREJECT, '-',
 157      "Clears all the prohibited or rejected uses of the certificate"},
 158     {"badsig", OPT_BADSIG, '-', "Corrupt last byte of certificate signature (for test)"},
 159     {"", OPT_MD, '-', "Any supported digest"},
 160     {"preserve_dates", OPT_PRESERVE_DATES, '-', "preserve existing dates when signing"},
 161     {NULL}
 162 };
 163
 164 int x509_main(int argc, char **argv)
 165 {
 166     ASN1_INTEGER *sno = NULL;
 167     ASN1_OBJECT *objtmp = NULL;
 168     BIO *out = NULL;
 169     CONF *extconf = NULL;
 170     EVP_PKEY *Upkey = NULL, *CApkey = NULL, *fkey = NULL;
 171     int newcert = 0;
 172     char *subj = NULL;
 173     X509_NAME *fsubj = NULL;
 174     const unsigned long chtype = MBSTRING_ASC;
 175     const int multirdn = 1;
 176     STACK_OF(ASN1_OBJECT) *trust = NULL, *reject = NULL;
 177     STACK_OF(OPENSSL_STRING) *sigopts = NULL, *vfyopts = NULL;
 178     X509 *x = NULL, *xca = NULL;
 179     X509_REQ *req = NULL, *rq = NULL;
 180     X509_STORE *ctx = NULL;
 181     const EVP_MD *digest = NULL;
 182     char *CAkeyfile = NULL, *CAserial = NULL, *fkeyfile = NULL, *alias = NULL;
 183     char *checkhost = NULL, *checkemail = NULL, *checkip = NULL, *exts = NULL;
 184     char *extsect = NULL, *extfile = NULL, *passin = NULL, *passinarg = NULL;
 185     char *infile = NULL, *outfile = NULL, *keyfile = NULL, *CAfile = NULL;
 186     char *prog;
 187     int x509req = 0, days = DEF_DAYS, modulus = 0, pubkey = 0, pprint = 0;
 188     int CAformat = FORMAT_PEM, CAkeyformat = FORMAT_PEM;
 189     int fingerprint = 0, reqfile = 0, checkend = 0;
 190     int informat = FORMAT_PEM, outformat = FORMAT_PEM, keyformat = FORMAT_PEM;
 191     int next_serial = 0, subject_hash = 0, issuer_hash = 0, ocspid = 0;
 192     int noout = 0, sign_flag = 0, CA_flag = 0, CA_createserial = 0, email = 0;
 193     int ocsp_uri = 0, trustout = 0, clrtrust = 0, clrreject = 0, aliasout = 0;
 194     int ret = 1, i, num = 0, badsig = 0, clrext = 0, nocert = 0;
 195     int text = 0, serial = 0, subject = 0, issuer = 0, startdate = 0, ext = 0;
 196     int enddate = 0;
 197     time_t checkoffset = 0;
 198     unsigned long certflag = 0;
 199     int preserve_dates = 0;
 200     OPTION_CHOICE o;
 201     ENGINE *e = NULL;
 202 #ifndef OPENSSL_NO_MD5
 203     int subject_hash_old = 0, issuer_hash_old = 0;
 204 #endif
 205
 206     ctx = X509_STORE_new();
 207     if (ctx == NULL)
 208         goto end;
 209     X509_STORE_set_verify_cb(ctx, callb);
 210
 211     prog = opt_init(argc, argv, x509_options);
 212     while ((o = opt_next()) != OPT_EOF) {
 213         switch (o) {
 214         case OPT_EOF:
 215         case OPT_ERR:
 216  opthelp:
 217             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 218             goto end;
 219         case OPT_HELP:
 220             opt_help(x509_options);
 221             ret = 0;
 222             goto end;
 223         case OPT_INFORM:
 224             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 225                 goto opthelp;
 226             break;
 227         case OPT_IN:
 228             infile = opt_arg();
 229             break;
 230         case OPT_OUTFORM:
 231             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
 232                 goto opthelp;
 233             break;
 234         case OPT_KEYFORM:
 235             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyformat))
 236                 goto opthelp;
 237             break;
 238         case OPT_CAFORM:
 239             if (!opt_format(opt_arg(), OPT_FMT_ANY, &CAformat))
 240                 goto opthelp;
 241             break;
 242         case OPT_CAKEYFORM:
 243             if (!opt_format(opt_arg(), OPT_FMT_ANY, &CAkeyformat))
 244                 goto opthelp;
 245             break;
 246         case OPT_OUT:
 247             outfile = opt_arg();
 248             break;
 249         case OPT_REQ:
 250             reqfile = 1;
 251             break;
 252
 253         case OPT_SIGOPT:
 254             if (!sigopts)
 255                 sigopts = sk_OPENSSL_STRING_new_null();
 256             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 257                 goto opthelp;
 258             break;
 259         case OPT_VFYOPT:
 260             if (!vfyopts)
 261                 vfyopts = sk_OPENSSL_STRING_new_null();
 262             if (!vfyopts || !sk_OPENSSL_STRING_push(vfyopts, opt_arg()))
 263                 goto opthelp;
 264             break;
 265         case OPT_DAYS:
 266             if (preserve_dates)
 267                 goto opthelp;
 268             days = atoi(opt_arg());
 269             break;
 270         case OPT_PASSIN:
 271             passinarg = opt_arg();
 272             break;
 273         case OPT_EXTFILE:
 274             extfile = opt_arg();
 275             break;
 276         case OPT_R_CASES:
 277             if (!opt_rand(o))
 278                 goto end;
 279             break;
 280         case OPT_PROV_CASES:
 281             if (!opt_provider(o))
 282                 goto end;
 283             break;
 284         case OPT_EXTENSIONS:
 285             extsect = opt_arg();
 286             break;
 287         case OPT_SIGNKEY:
 288             keyfile = opt_arg();
 289             sign_flag = ++num;
 290             break;
 291         case OPT_CA:
 292             CAfile = opt_arg();
 293             CA_flag = ++num;
 294             break;
 295         case OPT_CAKEY:
 296             CAkeyfile = opt_arg();
 297             break;
 298         case OPT_CASERIAL:
 299             CAserial = opt_arg();
 300             break;
 301         case OPT_SET_SERIAL:
 302             if (sno != NULL) {
 303                 BIO_printf(bio_err, "Serial number supplied twice\n");
 304                 goto opthelp;
 305             }
 306             if ((sno = s2i_ASN1_INTEGER(NULL, opt_arg())) == NULL)
 307                 goto opthelp;
 308             break;
 309         case OPT_NEW:
 310             newcert = 1;
 311             break;
 312         case OPT_FORCE_PUBKEY:
 313             fkeyfile = opt_arg();
 314             break;
 315         case OPT_SUBJ:
 316             subj = opt_arg();
 317             break;
 318         case OPT_ADDTRUST:
 319             if ((objtmp = OBJ_txt2obj(opt_arg(), 0)) == NULL) {
 320                 BIO_printf(bio_err,
 321                            "%s: Invalid trust object value %s\n",
 322                            prog, opt_arg());
 323                 goto opthelp;
 324             }
 325             if (trust == NULL && (trust = sk_ASN1_OBJECT_new_null()) == NULL)
 326                 goto end;
 327             sk_ASN1_OBJECT_push(trust, objtmp);
 328             objtmp = NULL;
 329             trustout = 1;
 330             break;
 331         case OPT_ADDREJECT:
 332             if ((objtmp = OBJ_txt2obj(opt_arg(), 0)) == NULL) {
 333                 BIO_printf(bio_err,
 334                            "%s: Invalid reject object value %s\n",
 335                            prog, opt_arg());
 336                 goto opthelp;
 337             }
 338             if (reject == NULL
 339                 && (reject = sk_ASN1_OBJECT_new_null()) == NULL)
 340                 goto end;
 341             sk_ASN1_OBJECT_push(reject, objtmp);
 342             objtmp = NULL;
 343             trustout = 1;
 344             break;
 345         case OPT_SETALIAS:
 346             alias = opt_arg();
 347             trustout = 1;
 348             break;
 349         case OPT_CERTOPT:
 350             if (!set_cert_ex(&certflag, opt_arg()))
 351                 goto opthelp;
 352             break;
 353         case OPT_NAMEOPT:
 354             if (!set_nameopt(opt_arg()))
 355                 goto opthelp;
 356             break;
 357         case OPT_ENGINE:
 358             e = setup_engine(opt_arg(), 0);
 359             break;
 360         case OPT_EMAIL:
 361             email = ++num;
 362             break;
 363         case OPT_OCSP_URI:
 364             ocsp_uri = ++num;
 365             break;
 366         case OPT_SERIAL:
 367             serial = ++num;
 368             break;
 369         case OPT_NEXT_SERIAL:
 370             next_serial = ++num;
 371             break;
 372         case OPT_MODULUS:
 373             modulus = ++num;
 374             break;
 375         case OPT_PUBKEY:
 376             pubkey = ++num;
 377             break;
 378         case OPT_X509TOREQ:
 379             x509req = ++num;
 380             break;
 381         case OPT_TEXT:
 382             text = ++num;
 383             break;
 384         case OPT_SUBJECT:
 385             subject = ++num;
 386             break;
 387         case OPT_ISSUER:
 388             issuer = ++num;
 389             break;
 390         case OPT_FINGERPRINT:
 391             fingerprint = ++num;
 392             break;
 393         case OPT_HASH:
 394             subject_hash = ++num;
 395             break;
 396         case OPT_ISSUER_HASH:
 397             issuer_hash = ++num;
 398             break;
 399         case OPT_PURPOSE:
 400             pprint = ++num;
 401             break;
 402         case OPT_STARTDATE:
 403             startdate = ++num;
 404             break;
 405         case OPT_ENDDATE:
 406             enddate = ++num;
 407             break;
 408         case OPT_NOOUT:
 409             noout = ++num;
 410             break;
 411         case OPT_EXT:
 412             ext = ++num;
 413             exts = opt_arg();
 414             break;
 415         case OPT_NOCERT:
 416             nocert = 1;
 417             break;
 418         case OPT_TRUSTOUT:
 419             trustout = 1;
 420             break;
 421         case OPT_CLRTRUST:
 422             clrtrust = ++num;
 423             break;
 424         case OPT_CLRREJECT:
 425             clrreject = ++num;
 426             break;
 427         case OPT_ALIAS:
 428             aliasout = ++num;
 429             break;
 430         case OPT_CACREATESERIAL:
 431             CA_createserial = ++num;
 432             break;
 433         case OPT_CLREXT:
 434             clrext = 1;
 435             break;
 436         case OPT_OCSPID:
 437             ocspid = ++num;
 438             break;
 439         case OPT_BADSIG:
 440             badsig = 1;
 441             break;
 442 #ifndef OPENSSL_NO_MD5
 443         case OPT_SUBJECT_HASH_OLD:
 444             subject_hash_old = ++num;
 445             break;
 446         case OPT_ISSUER_HASH_OLD:
 447             issuer_hash_old = ++num;
 448             break;
 449 #else
 450         case OPT_SUBJECT_HASH_OLD:
 451         case OPT_ISSUER_HASH_OLD:
 452             break;
 453 #endif
 454         case OPT_DATES:
 455             startdate = ++num;
 456             enddate = ++num;
 457             break;
 458         case OPT_CHECKEND:
 459             checkend = 1;
 460             {
 461                 intmax_t temp = 0;
 462                 if (!opt_imax(opt_arg(), &temp))
 463                     goto opthelp;
 464                 checkoffset = (time_t)temp;
 465                 if ((intmax_t)checkoffset != temp) {
 466                     BIO_printf(bio_err, "%s: Checkend time out of range %s\n",
 467                                prog, opt_arg());
 468                     goto opthelp;
 469                 }
 470             }
 471             break;
 472         case OPT_CHECKHOST:
 473             checkhost = opt_arg();
 474             break;
 475         case OPT_CHECKEMAIL:
 476             checkemail = opt_arg();
 477             break;
 478         case OPT_CHECKIP:
 479             checkip = opt_arg();
 480             break;
 481         case OPT_PRESERVE_DATES:
 482             if (days != DEF_DAYS)
 483                 goto opthelp;
 484             preserve_dates = 1;
 485             break;
 486         case OPT_MD:
 487             if (!opt_md(opt_unknown(), &digest))
 488                 goto opthelp;
 489         }
 490     }
 491
 492     /* No extra arguments. */
 493     argc = opt_num_rest();
 494     if (argc != 0)
 495         goto opthelp;
 496
 497     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 498         BIO_printf(bio_err, "Error getting password\n");
 499         goto end;
 500     }
 501
 502     if (!X509_STORE_set_default_paths_ex(ctx, app_get0_libctx(),
 503                                          app_get0_propq())) {
 504         ERR_print_errors(bio_err);
 505         goto end;
 506     }
 507
 508     if (newcert && infile != NULL) {
 509         BIO_printf(bio_err, "The -in option must not be used since -new is set\n");
 510         goto end;
 511     }
 512     if (newcert && fkeyfile == NULL) {
 513         BIO_printf(bio_err,
 514                    "The -new option requires a public key to be set using -force_pubkey\n");
 515         goto end;
 516     }
 517     if (fkeyfile != NULL) {
 518         fkey = load_pubkey(fkeyfile, keyformat, 0, NULL, e, "forced key");
 519         if (fkey == NULL)
 520             goto end;
 521     }
 522
 523     if (newcert && subj == NULL) {
 524         BIO_printf(bio_err,
 525                    "The -new option requires a subject to be set using -subj\n");
 526         goto end;
 527     }
 528     if (subj != NULL
 529             && (fsubj = parse_name(subj, chtype, multirdn, "subject")) == NULL)
 530         goto end;
 531
 532     if (CAkeyfile == NULL && CA_flag && CAformat == FORMAT_PEM) {
 533         CAkeyfile = CAfile;
 534     } else if (CA_flag && CAkeyfile == NULL) {
 535         BIO_printf(bio_err,
 536                    "Need to specify a CAkey if using the CA command\n");
 537         goto end;
 538     } else if (!CA_flag && CAkeyfile != NULL) {
 539         BIO_printf(bio_err,
 540                    "Ignoring -CAkey option since no -CA option is given\n");
 541     }
 542
 543     if (extfile != NULL) {
 544         X509V3_CTX ctx2;
 545         if ((extconf = app_load_config(extfile)) == NULL)
 546             goto end;
 547         if (extsect == NULL) {
 548             extsect = NCONF_get_string(extconf, "default", "extensions");
 549             if (extsect == NULL) {
 550                 ERR_clear_error();
 551                 extsect = "default";
 552             }
 553         }
 554         X509V3_set_ctx_test(&ctx2);
 555         X509V3_set_nconf(&ctx2, extconf);
 556         if (!X509V3_EXT_add_nconf(extconf, &ctx2, extsect, NULL)) {
 557             BIO_printf(bio_err,
 558                        "Error checking extension section %s\n", extsect);
 559             ERR_print_errors(bio_err);
 560             goto end;
 561         }
 562     }
 563
 564     if (reqfile) {
 565         EVP_PKEY *pkey;
 566
 567         req = load_csr(infile, informat, "certificate request input");
 568         if (req == NULL)
 569             goto end;
 570
 571         if ((pkey = X509_REQ_get0_pubkey(req)) == NULL) {
 572             BIO_printf(bio_err, "Error unpacking public key\n");
 573             goto end;
 574         }
 575         i = do_X509_REQ_verify(req, pkey, vfyopts);
 576         if (i < 0) {
 577             BIO_printf(bio_err, "Request self-signature verification error\n");
 578             ERR_print_errors(bio_err);
 579             goto end;
 580         }
 581         if (i == 0) {
 582             BIO_printf(bio_err,
 583                        "Request self-signature did not match the certificate request\n");
 584             goto end;
 585         } else {
 586             BIO_printf(bio_err, "Request self-signature ok\n");
 587         }
 588
 589         print_name(bio_err, "subject=", X509_REQ_get_subject_name(req),
 590                    get_nameopt());
 591     }
 592
 593     if (reqfile || newcert) {
 594         X509_NAME *n;
 595
 596         if (!sign_flag && CAkeyfile == NULL) {
 597             BIO_printf(bio_err,
 598                        "We need a private key to sign with, use -signkey or -CAkey or -CA <file> with private key\n");
 599             goto end;
 600         }
 601         if ((x = X509_new_ex(app_get0_libctx(), app_get0_propq())) == NULL)
 602             goto end;
 603
 604         if (sno == NULL) {
 605             sno = ASN1_INTEGER_new();
 606             if (sno == NULL || !rand_serial(NULL, sno))
 607                 goto end;
 608             if (!X509_set_serialNumber(x, sno))
 609                 goto end;
 610             ASN1_INTEGER_free(sno);
 611             sno = NULL;
 612         } else if (!X509_set_serialNumber(x, sno)) {
 613             goto end;
 614         }
 615
 616         n = req == NULL ? fsubj : X509_REQ_get_subject_name(req);
 617         if (!X509_set_issuer_name(x, n) || !X509_set_subject_name(x, n))
 618             goto end;
 619         if (!set_cert_times(x, NULL, NULL, days))
 620             goto end;
 621
 622         if (!X509_set_pubkey(x, fkey != NULL ? fkey : X509_REQ_get0_pubkey(req)))
 623             goto end;
 624     } else {
 625         x = load_cert_pass(infile, 1, passin, "certificate");
 626         if (x == NULL)
 627             goto end;
 628         if (fkey != NULL && !X509_set_pubkey(x, fkey))
 629             goto end;
 630         if (fsubj != NULL && !X509_set_subject_name(x, fsubj))
 631             goto end;
 632     }
 633
 634     if (CA_flag) {
 635         xca = load_cert_pass(CAfile, 1, passin, "CA certificate");
 636         if (xca == NULL)
 637             goto end;
 638     }
 639
 640     out = bio_open_default(outfile, 'w', outformat);
 641     if (out == NULL)
 642         goto end;
 643
 644     if (!noout || text || next_serial)
 645         OBJ_create("2.99999.3", "SET.ex3", "SET x509v3 extension 3");
 646
 647     if (alias)
 648         X509_alias_set1(x, (unsigned char *)alias, -1);
 649
 650     if (clrtrust)
 651         X509_trust_clear(x);
 652     if (clrreject)
 653         X509_reject_clear(x);
 654
 655     if (trust != NULL) {
 656         for (i = 0; i < sk_ASN1_OBJECT_num(trust); i++) {
 657             objtmp = sk_ASN1_OBJECT_value(trust, i);
 658             X509_add1_trust_object(x, objtmp);
 659         }
 660         objtmp = NULL;
 661     }
 662
 663     if (reject != NULL) {
 664         for (i = 0; i < sk_ASN1_OBJECT_num(reject); i++) {
 665             objtmp = sk_ASN1_OBJECT_value(reject, i);
 666             X509_add1_reject_object(x, objtmp);
 667         }
 668         objtmp = NULL;
 669     }
 670
 671     if (badsig) {
 672         const ASN1_BIT_STRING *signature;
 673
 674         X509_get0_signature(&signature, NULL, x);
 675         corrupt_signature(signature);
 676     }
 677
 678     if (num) {
 679         for (i = 1; i <= num; i++) {
 680             if (issuer == i) {
 681                 print_name(out, "issuer=", X509_get_issuer_name(x), get_nameopt());
 682             } else if (subject == i) {
 683                 print_name(out, "subject=",
 684                            X509_get_subject_name(x), get_nameopt());
 685             } else if (serial == i) {
 686                 BIO_printf(out, "serial=");
 687                 i2a_ASN1_INTEGER(out, X509_get0_serialNumber(x));
 688                 BIO_printf(out, "\n");
 689             } else if (next_serial == i) {
 690                 ASN1_INTEGER *ser = X509_get_serialNumber(x);
 691                 BIGNUM *bnser = ASN1_INTEGER_to_BN(ser, NULL);
 692
 693                 if (!bnser)
 694                     goto end;
 695                 if (!BN_add_word(bnser, 1))
 696                     goto end;
 697                 ser = BN_to_ASN1_INTEGER(bnser, NULL);
 698                 if (!ser)
 699                     goto end;
 700                 BN_free(bnser);
 701                 i2a_ASN1_INTEGER(out, ser);
 702                 ASN1_INTEGER_free(ser);
 703                 BIO_puts(out, "\n");
 704             } else if (email == i || ocsp_uri == i) {
 705                 int j;
 706                 STACK_OF(OPENSSL_STRING) *emlst;
 707                 if (email == i)
 708                     emlst = X509_get1_email(x);
 709                 else
 710                     emlst = X509_get1_ocsp(x);
 711                 for (j = 0; j < sk_OPENSSL_STRING_num(emlst); j++)
 712                     BIO_printf(out, "%s\n",
 713                                sk_OPENSSL_STRING_value(emlst, j));
 714                 X509_email_free(emlst);
 715             } else if (aliasout == i) {
 716                 unsigned char *alstr;
 717                 alstr = X509_alias_get0(x, NULL);
 718                 if (alstr)
 719                     BIO_printf(out, "%s\n", alstr);
 720                 else
 721                     BIO_puts(out, "<No Alias>\n");
 722             } else if (subject_hash == i) {
 723                 BIO_printf(out, "%08lx\n", X509_subject_name_hash(x));
 724             }
 725 #ifndef OPENSSL_NO_MD5
 726             else if (subject_hash_old == i) {
 727                 BIO_printf(out, "%08lx\n", X509_subject_name_hash_old(x));
 728             }
 729 #endif
 730             else if (issuer_hash == i) {
 731                 BIO_printf(out, "%08lx\n", X509_issuer_name_hash(x));
 732             }
 733 #ifndef OPENSSL_NO_MD5
 734             else if (issuer_hash_old == i) {
 735                 BIO_printf(out, "%08lx\n", X509_issuer_name_hash_old(x));
 736             }
 737 #endif
 738             else if (pprint == i) {
 739                 X509_PURPOSE *ptmp;
 740                 int j;
 741                 BIO_printf(out, "Certificate purposes:\n");
 742                 for (j = 0; j < X509_PURPOSE_get_count(); j++) {
 743                     ptmp = X509_PURPOSE_get0(j);
 744                     purpose_print(out, x, ptmp);
 745                 }
 746             } else if (modulus == i) {
 747                 EVP_PKEY *pkey;
 748
 749                 pkey = X509_get0_pubkey(x);
 750                 if (pkey == NULL) {
 751                     BIO_printf(bio_err, "Modulus=unavailable\n");
 752                     ERR_print_errors(bio_err);
 753                     goto end;
 754                 }
 755                 BIO_printf(out, "Modulus=");
 756                 if (EVP_PKEY_is_a(pkey, "RSA")) {
 757                     BIGNUM *n;
 758
 759                     /* Every RSA key has an 'n' */
 760                     EVP_PKEY_get_bn_param(pkey, "n", &n);
 761                     BN_print(out, n);
 762                     BN_free(n);
 763                 } else if (EVP_PKEY_is_a(pkey, "DSA")) {
 764                     BIGNUM *dsapub;
 765
 766                     /* Every DSA key has an 'pub' */
 767                     EVP_PKEY_get_bn_param(pkey, "pub", &dsapub);
 768                     BN_print(out, dsapub);
 769                     BN_free(dsapub);
 770                 } else {
 771                     BIO_printf(out, "Wrong Algorithm type");
 772                 }
 773                 BIO_printf(out, "\n");
 774             } else if (pubkey == i) {
 775                 EVP_PKEY *pkey;
 776
 777                 pkey = X509_get0_pubkey(x);
 778                 if (pkey == NULL) {
 779                     BIO_printf(bio_err, "Error getting public key\n");
 780                     ERR_print_errors(bio_err);
 781                     goto end;
 782                 }
 783                 PEM_write_bio_PUBKEY(out, pkey);
 784             } else if (text == i) {
 785                 X509_print_ex(out, x, get_nameopt(), certflag);
 786             } else if (startdate == i) {
 787                 BIO_puts(out, "notBefore=");
 788                 ASN1_TIME_print(out, X509_get0_notBefore(x));
 789                 BIO_puts(out, "\n");
 790             } else if (enddate == i) {
 791                 BIO_puts(out, "notAfter=");
 792                 ASN1_TIME_print(out, X509_get0_notAfter(x));
 793                 BIO_puts(out, "\n");
 794             } else if (fingerprint == i) {
 795                 int j;
 796                 unsigned int n;
 797                 unsigned char md[EVP_MAX_MD_SIZE];
 798                 const EVP_MD *fdig = digest;
 799
 800                 if (fdig == NULL)
 801                     fdig = EVP_sha1();
 802
 803                 if (!X509_digest(x, fdig, md, &n)) {
 804                     BIO_printf(bio_err, "Out of memory\n");
 805                     goto end;
 806                 }
 807                 BIO_printf(out, "%s Fingerprint=",
 808                            OBJ_nid2sn(EVP_MD_type(fdig)));
 809                 for (j = 0; j < (int)n; j++) {
 810                     BIO_printf(out, "%02X%c", md[j], (j + 1 == (int)n)
 811                                ? '\n' : ':');
 812                 }
 813             }
 814
 815             /* should be in the library */
 816             else if (sign_flag == i && x509req == 0) {
 817                 if (Upkey == NULL) {
 818                     Upkey = load_key(keyfile, keyformat, 0,
 819                                      passin, e, "private key");
 820                     if (Upkey == NULL)
 821                         goto end;
 822                 }
 823                 if (fkey == NULL && !X509_set_pubkey(x, Upkey))
 824                     goto end;
 825                 if (!sign(x, Upkey, x /* self-issuing */, sigopts, days, clrext,
 826                           digest, extconf, extsect, preserve_dates)) {
 827                     ERR_print_errors(bio_err);
 828                     goto end;
 829                 }
 830             } else if (CA_flag == i) {
 831                 if (CAkeyfile != NULL) {
 832                     CApkey = load_key(CAkeyfile, CAkeyformat,
 833                                       0, passin, e, "CA private key");
 834                     if (CApkey == NULL)
 835                         goto end;
 836                 }
 837
 838                 if (!x509_certify(ctx, CAfile, digest, x, xca,
 839                                   CApkey, sigopts,
 840                                   CAserial, CA_createserial, days, clrext,
 841                                   extconf, extsect, sno, reqfile, preserve_dates))
 842                     goto end;
 843             } else if (x509req == i) {
 844                 EVP_PKEY *pk;
 845
 846                 if (keyfile == NULL) {
 847                     BIO_printf(bio_err, "No request key file specified\n");
 848                     goto end;
 849                 } else {
 850                     pk = load_key(keyfile, keyformat, 0,
 851                                   passin, e, "request key");
 852                     if (pk == NULL)
 853                         goto end;
 854                 }
 855
 856                 rq = X509_to_X509_REQ(x, pk, digest);
 857                 EVP_PKEY_free(pk);
 858                 if (rq == NULL) {
 859                     ERR_print_errors(bio_err);
 860                     goto end;
 861                 }
 862                 if (!noout) {
 863                     X509_REQ_print_ex(out, rq, get_nameopt(), X509_FLAG_COMPAT);
 864                     PEM_write_bio_X509_REQ(out, rq);
 865                 }
 866                 noout = 1;
 867             } else if (ocspid == i) {
 868                 X509_ocspid_print(out, x);
 869             } else if (ext == i) {
 870                 print_x509v3_exts(out, x, exts);
 871             }
 872         }
 873     }
 874
 875     if (checkend) {
 876         time_t tcheck = time(NULL) + checkoffset;
 877
 878         if (X509_cmp_time(X509_get0_notAfter(x), &tcheck) < 0) {
 879             BIO_printf(out, "Certificate will expire\n");
 880             ret = 1;
 881         } else {
 882             BIO_printf(out, "Certificate will not expire\n");
 883             ret = 0;
 884         }
 885         goto end;
 886     }
 887
 888     print_cert_checks(out, x, checkhost, checkemail, checkip);
 889
 890     if (noout || nocert) {
 891         ret = 0;
 892         goto end;
 893     }
 894
 895     if (outformat == FORMAT_ASN1) {
 896         i = i2d_X509_bio(out, x);
 897     } else if (outformat == FORMAT_PEM) {
 898         if (trustout)
 899             i = PEM_write_bio_X509_AUX(out, x);
 900         else
 901             i = PEM_write_bio_X509(out, x);
 902     } else {
 903         BIO_printf(bio_err, "Bad output format specified for outfile\n");
 904         goto end;
 905     }
 906     if (!i) {
 907         BIO_printf(bio_err, "Unable to write certificate\n");
 908         ERR_print_errors(bio_err);
 909         goto end;
 910     }
 911     ret = 0;
 912  end:
 913     NCONF_free(extconf);
 914     BIO_free_all(out);
 915     X509_STORE_free(ctx);
 916     X509_NAME_free(fsubj);
 917     X509_REQ_free(req);
 918     X509_free(x);
 919     X509_free(xca);
 920     EVP_PKEY_free(Upkey);
 921     EVP_PKEY_free(CApkey);
 922     EVP_PKEY_free(fkey);
 923     sk_OPENSSL_STRING_free(sigopts);
 924     sk_OPENSSL_STRING_free(vfyopts);
 925     X509_REQ_free(rq);
 926     ASN1_INTEGER_free(sno);
 927     sk_ASN1_OBJECT_pop_free(trust, ASN1_OBJECT_free);
 928     sk_ASN1_OBJECT_pop_free(reject, ASN1_OBJECT_free);
 929     ASN1_OBJECT_free(objtmp);
 930     release_engine(e);
 931     clear_free(passin);
 932     return ret;
 933 }
 934
 935 static ASN1_INTEGER *x509_load_serial(const char *CAfile,
 936                                       const char *serialfile, int create)
 937 {
 938     char *buf = NULL;
 939     ASN1_INTEGER *bs = NULL;
 940     BIGNUM *serial = NULL;
 941
 942     if (serialfile == NULL) {
 943         const char *p = strrchr(CAfile, '.');
 944         size_t len = p != NULL ? (size_t)(p - CAfile) : strlen(CAfile);
 945
 946         buf = app_malloc(len + sizeof(POSTFIX), "serial# buffer");
 947         memcpy(buf, CAfile, len);
 948         memcpy(buf + len, POSTFIX, sizeof(POSTFIX));
 949         serialfile = buf;
 950     }
 951
 952     serial = load_serial(serialfile, create, NULL);
 953     if (serial == NULL)
 954         goto end;
 955
 956     if (!BN_add_word(serial, 1)) {
 957         BIO_printf(bio_err, "Serial number increment failure\n");
 958         goto end;
 959     }
 960
 961     if (!save_serial(serialfile, NULL, serial, &bs))
 962         goto end;
 963
 964  end:
 965     OPENSSL_free(buf);
 966     BN_free(serial);
 967     return bs;
 968 }
 969
 970 static int x509_certify(X509_STORE *ctx, const char *CAfile, const EVP_MD *digest,
 971                         X509 *x, X509 *xca, EVP_PKEY *pkey,
 972                         STACK_OF(OPENSSL_STRING) *sigopts,
 973                         const char *serialfile, int create,
 974                         int days, int clrext, CONF *conf, const char *section,
 975                         ASN1_INTEGER *sno, int reqfile, int preserve_dates)
 976 {
 977     int ret = 0;
 978     ASN1_INTEGER *bs = NULL;
 979     X509_STORE_CTX *xsc = NULL;
 980     EVP_PKEY *upkey;
 981
 982     upkey = X509_get0_pubkey(xca);
 983     if (upkey == NULL) {
 984         BIO_printf(bio_err, "Error obtaining CA X509 public key\n");
 985         goto end;
 986     }
 987     EVP_PKEY_copy_parameters(upkey, pkey);
 988
 989     xsc = X509_STORE_CTX_new();
 990     if (xsc == NULL || !X509_STORE_CTX_init(xsc, ctx, x, NULL)) {
 991         BIO_printf(bio_err, "Error initialising X509 store\n");
 992         goto end;
 993     }
 994     if (sno)
 995         bs = sno;
 996     else if ((bs = x509_load_serial(CAfile, serialfile, create)) == NULL)
 997         goto end;
 998
 999     /*
1000      * NOTE: this certificate can/should be self-signed, unless it was a
1001      * certificate request in which case it is not.
1002      */
1003     X509_STORE_CTX_set_cert(xsc, x);
1004     X509_STORE_CTX_set_flags(xsc, X509_V_FLAG_CHECK_SS_SIGNATURE);
1005     if (!reqfile && X509_verify_cert(xsc) <= 0)
1006         goto end;
1007
1008     if (!X509_check_private_key(xca, pkey)) {
1009         BIO_printf(bio_err,
1010                    "CA certificate and CA private key do not match\n");
1011         goto end;
1012     }
1013
1014     if (!X509_set_serialNumber(x, bs))
1015         goto end;
1016
1017     if (!sign(x, pkey, xca, sigopts, days, clrext, digest,
1018               conf, section, preserve_dates))
1019         goto end;
1020
1021     ret = 1;
1022  end:
1023     X509_STORE_CTX_free(xsc);
1024     if (!ret)
1025         ERR_print_errors(bio_err);
1026     if (!sno)
1027         ASN1_INTEGER_free(bs);
1028     return ret;
1029 }
1030
1031 static int callb(int ok, X509_STORE_CTX *ctx)
1032 {
1033     int err;
1034     X509 *err_cert;
1035
1036     /*
1037      * It is ok to use a self-signed certificate. This case will catch both
1038      * the initial ok == 0 and the final ok == 1 calls to this function.
1039      */
1040     err = X509_STORE_CTX_get_error(ctx);
1041     if (err == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
1042         return 1;
1043
1044     /*
1045      * BAD we should have gotten an error.  Normally if everything worked
1046      * X509_STORE_CTX_get_error(ctx) will still be set to
1047      * DEPTH_ZERO_SELF_....
1048      */
1049     if (ok) {
1050         BIO_printf(bio_err,
1051                    "Error with certificate to be certified - should be self-signed\n");
1052         return 0;
1053     } else {
1054         err_cert = X509_STORE_CTX_get_current_cert(ctx);
1055         print_name(bio_err, NULL, X509_get_subject_name(err_cert), 0);
1056         BIO_printf(bio_err,
1057                    "Error with certificate - error %d at depth %d\n%s\n", err,
1058                    X509_STORE_CTX_get_error_depth(ctx),
1059                    X509_verify_cert_error_string(err));
1060         return 1;
1061     }
1062 }
1063
1064 static int sign(X509 *x, EVP_PKEY *pkey, X509 *issuer,
1065                 STACK_OF(OPENSSL_STRING) *sigopts,
1066                 int days, int clrext,
1067                 const EVP_MD *digest, CONF *conf, const char *section,
1068                 int preserve_dates)
1069 {
1070     X509V3_CTX ext_ctx;
1071
1072     if (!X509_set_issuer_name(x, X509_get_subject_name(issuer)))
1073         return 0;
1074
1075     if (!preserve_dates && !set_cert_times(x, NULL, NULL, days))
1076         return 0;
1077
1078     if (clrext) {
1079         while (X509_get_ext_count(x) > 0)
1080             X509_delete_ext(x, 0);
1081     }
1082
1083     X509V3_set_ctx(&ext_ctx, issuer, x, NULL, NULL, X509V3_CTX_REPLACE);
1084     if (issuer == x
1085         /* prepare the correct AKID of self-issued, possibly self-signed cert */
1086             && !X509V3_set_issuer_pkey(&ext_ctx, pkey))
1087         return 0;
1088
1089     if (conf != NULL) {
1090         X509V3_set_nconf(&ext_ctx, conf);
1091         if (!X509V3_EXT_add_nconf(conf, &ext_ctx, section, x)) {
1092             BIO_printf(bio_err,
1093                        "Error adding extensions from section %s\n", section);
1094             return 0;
1095         }
1096     }
1097     return do_X509_sign(x, pkey, digest, sigopts, &ext_ctx);
1098 }
1099
1100 static int purpose_print(BIO *bio, X509 *cert, X509_PURPOSE *pt)
1101 {
1102     int id, i, idret;
1103     const char *pname;
1104     id = X509_PURPOSE_get_id(pt);
1105     pname = X509_PURPOSE_get0_name(pt);
1106     for (i = 0; i < 2; i++) {
1107         idret = X509_check_purpose(cert, id, i);
1108         BIO_printf(bio, "%s%s : ", pname, i ? " CA" : "");
1109         if (idret == 1)
1110             BIO_printf(bio, "Yes\n");
1111         else if (idret == 0)
1112             BIO_printf(bio, "No\n");
1113         else
1114             BIO_printf(bio, "Yes (WARNING code=%d)\n", idret);
1115     }
1116     return 1;
1117 }
1118
1119 static int parse_ext_names(char *names, const char **result)
1120 {
1121     char *p, *q;
1122     int cnt = 0, len = 0;
1123
1124     p = q = names;
1125     len = strlen(names);
1126
1127     while (q - names <= len) {
1128         if (*q != ',' && *q != '\0') {
1129             q++;
1130             continue;
1131         }
1132         if (p != q) {
1133             /* found */
1134             if (result != NULL) {
1135                 result[cnt] = p;
1136                 *q = '\0';
1137             }
1138             cnt++;
1139         }
1140         p = ++q;
1141     }
1142
1143     return cnt;
1144 }
1145
1146 static int print_x509v3_exts(BIO *bio, X509 *x, const char *ext_names)
1147 {
1148     const STACK_OF(X509_EXTENSION) *exts = NULL;
1149     STACK_OF(X509_EXTENSION) *exts2 = NULL;
1150     X509_EXTENSION *ext = NULL;
1151     ASN1_OBJECT *obj;
1152     int i, j, ret = 0, num, nn = 0;
1153     const char *sn, **names = NULL;
1154     char *tmp_ext_names = NULL;
1155
1156     exts = X509_get0_extensions(x);
1157     if ((num = sk_X509_EXTENSION_num(exts)) <= 0) {
1158         BIO_printf(bio_err, "No extensions in certificate\n");
1159         ret = 1;
1160         goto end;
1161     }
1162
1163     /* parse comma separated ext name string */
1164     if ((tmp_ext_names = OPENSSL_strdup(ext_names)) == NULL)
1165         goto end;
1166     if ((nn = parse_ext_names(tmp_ext_names, NULL)) == 0) {
1167         BIO_printf(bio, "Invalid extension names: %s\n", ext_names);
1168         goto end;
1169     }
1170     if ((names = OPENSSL_malloc(sizeof(char *) * nn)) == NULL)
1171         goto end;
1172     parse_ext_names(tmp_ext_names, names);
1173
1174     for (i = 0; i < num; i++) {
1175         ext = sk_X509_EXTENSION_value(exts, i);
1176
1177         /* check if this ext is what we want */
1178         obj = X509_EXTENSION_get_object(ext);
1179         sn = OBJ_nid2sn(OBJ_obj2nid(obj));
1180         if (sn == NULL || strcmp(sn, "UNDEF") == 0)
1181             continue;
1182
1183         for (j = 0; j < nn; j++) {
1184             if (strcmp(sn, names[j]) == 0) {
1185                 /* push the extension into a new stack */
1186                 if (exts2 == NULL
1187                     && (exts2 = sk_X509_EXTENSION_new_null()) == NULL)
1188                     goto end;
1189                 if (!sk_X509_EXTENSION_push(exts2, ext))
1190                     goto end;
1191             }
1192         }
1193     }
1194
1195     if (!sk_X509_EXTENSION_num(exts2)) {
1196         BIO_printf(bio, "No extensions matched with %s\n", ext_names);
1197         ret = 1;
1198         goto end;
1199     }
1200
1201     ret = X509V3_extensions_print(bio, NULL, exts2, 0, 0);
1202  end:
1203     sk_X509_EXTENSION_free(exts2);
1204     OPENSSL_free(names);
1205     OPENSSL_free(tmp_ext_names);
1206     return ret;
1207 }