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 #ifndef OPENSSL_NO_RSA
  25 # include <openssl/rsa.h>
  26 #endif
  27 #ifndef OPENSSL_NO_DSA
  28 # include <openssl/dsa.h>
  29 #endif
  30
  31 #undef POSTFIX
  32 #define POSTFIX ".srl"
  33 #define DEF_DAYS        30
  34
  35 static int callb(int ok, X509_STORE_CTX *ctx);
  36 static int sign(X509 *x, EVP_PKEY *pkey, EVP_PKEY *fkey,
  37                 STACK_OF(OPENSSL_STRING) *sigopts,
  38                 int days, int clrext,
  39                 const EVP_MD *digest, CONF *conf, const char *section,
  40                 int preserve_dates);
  41 static int x509_certify(X509_STORE *ctx, const char *CAfile, const EVP_MD *digest,
  42                         X509 *x, X509 *xca, EVP_PKEY *pkey,
  43                         STACK_OF(OPENSSL_STRING) *sigopts, const char *serialfile,
  44                         int create, int days, int clrext, CONF *conf,
  45                         const char *section, ASN1_INTEGER *sno, int reqfile,
  46                         int preserve_dates);
  47 static int purpose_print(BIO *bio, X509 *cert, X509_PURPOSE *pt);
  48 static int print_x509v3_exts(BIO *bio, X509 *x, const char *exts);
  49
  50 typedef enum OPTION_choice {
  51     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
  52     OPT_INFORM, OPT_OUTFORM, OPT_KEYFORM, OPT_REQ, OPT_CAFORM,
  53     OPT_CAKEYFORM, OPT_VFYOPT, OPT_SIGOPT, OPT_DAYS, OPT_PASSIN, OPT_EXTFILE,
  54     OPT_EXTENSIONS, OPT_IN, OPT_OUT, OPT_SIGNKEY, OPT_CA, OPT_CAKEY,
  55     OPT_CASERIAL, OPT_SET_SERIAL, OPT_NEW, OPT_FORCE_PUBKEY, OPT_SUBJ,
  56     OPT_ADDTRUST, OPT_ADDREJECT, OPT_SETALIAS, OPT_CERTOPT, OPT_NAMEOPT,
  57     OPT_EMAIL, OPT_OCSP_URI, OPT_SERIAL, OPT_NEXT_SERIAL,
  58     OPT_MODULUS, OPT_PUBKEY, OPT_X509TOREQ, OPT_TEXT, OPT_HASH,
  59     OPT_ISSUER_HASH, OPT_SUBJECT, OPT_ISSUER, OPT_FINGERPRINT, OPT_DATES,
  60     OPT_PURPOSE, OPT_STARTDATE, OPT_ENDDATE, OPT_CHECKEND, OPT_CHECKHOST,
  61     OPT_CHECKEMAIL, OPT_CHECKIP, OPT_NOOUT, OPT_TRUSTOUT, OPT_CLRTRUST,
  62     OPT_CLRREJECT, OPT_ALIAS, OPT_CACREATESERIAL, OPT_CLREXT, OPT_OCSPID,
  63     OPT_SUBJECT_HASH_OLD,
  64     OPT_ISSUER_HASH_OLD,
  65     OPT_BADSIG, OPT_MD, OPT_ENGINE, OPT_NOCERT, OPT_PRESERVE_DATES,
  66     OPT_R_ENUM, OPT_PROV_ENUM, OPT_EXT
  67 } OPTION_CHOICE;
  68
  69 const OPTIONS x509_options[] = {
  70     OPT_SECTION("General"),
  71     {"help", OPT_HELP, '-', "Display this summary"},
  72 #ifndef OPENSSL_NO_ENGINE
  73     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
  74 #endif
  75
  76     {"inform", OPT_INFORM, 'f',
  77      "CSR input format (DER or PEM) - default PEM"},
  78     {"in", OPT_IN, '<', "Input file - default stdin"},
  79     {"passin", OPT_PASSIN, 's', "Private key and cert file pass-phrase source"},
  80     {"outform", OPT_OUTFORM, 'f',
  81      "Output format (DER or PEM) - default PEM"},
  82     {"out", OPT_OUT, '>', "Output file - default stdout"},
  83     {"keyform", OPT_KEYFORM, 'E', "Private key format (ENGINE, other values ignored)"},
  84     {"req", OPT_REQ, '-', "Input is a certificate request, sign and output"},
  85     {"vfyopt", OPT_VFYOPT, 's', "Verification parameter in n:v form"},
  86
  87     OPT_SECTION("Output"),
  88     {"serial", OPT_SERIAL, '-', "Print serial number value"},
  89     {"subject_hash", OPT_HASH, '-', "Print subject hash value"},
  90     {"issuer_hash", OPT_ISSUER_HASH, '-', "Print issuer hash value"},
  91     {"hash", OPT_HASH, '-', "Synonym for -subject_hash"},
  92     {"subject", OPT_SUBJECT, '-', "Print subject DN"},
  93     {"issuer", OPT_ISSUER, '-', "Print issuer DN"},
  94     {"email", OPT_EMAIL, '-', "Print email address(es)"},
  95     {"purpose", OPT_PURPOSE, '-', "Print out certificate purposes"},
  96     {"modulus", OPT_MODULUS, '-', "Print the RSA key modulus"},
  97     {"pubkey", OPT_PUBKEY, '-', "Output the public key"},
  98     {"fingerprint", OPT_FINGERPRINT, '-', "Print the certificate fingerprint"},
  99     {"alias", OPT_ALIAS, '-', "Output certificate alias"},
 100     {"noout", OPT_NOOUT, '-', "No output, just status"},
 101     {"ocspid", OPT_OCSPID, '-',
 102      "Print OCSP hash values for the subject name and public key"},
 103     {"ocsp_uri", OPT_OCSP_URI, '-', "Print OCSP Responder URL(s)"},
 104     {"nocert", OPT_NOCERT, '-', "No certificate output"},
 105     {"trustout", OPT_TRUSTOUT, '-', "Output a trusted certificate"},
 106     {"x509toreq", OPT_X509TOREQ, '-',
 107      "Output a certification request object"},
 108     {"checkend", OPT_CHECKEND, 'M',
 109      "Check whether the cert expires in the next arg seconds"},
 110     {OPT_MORE_STR, 1, 1, "Exit 1 if so, 0 if not"},
 111     {"text", OPT_TEXT, '-', "Print the certificate in text form"},
 112     {"ext", OPT_EXT, 's', "Print various X509V3 extensions"},
 113 #ifndef OPENSSL_NO_MD5
 114     {"subject_hash_old", OPT_SUBJECT_HASH_OLD, '-',
 115      "Print old-style (MD5) subject hash value"},
 116     {"issuer_hash_old", OPT_ISSUER_HASH_OLD, '-',
 117      "Print old-style (MD5) issuer hash value"},
 118 #endif
 119     {"nameopt", OPT_NAMEOPT, 's', "Certificate subject/issuer name printing options"},
 120
 121     OPT_SECTION("Certificate"),
 122     {"startdate", OPT_STARTDATE, '-', "Set notBefore field"},
 123     {"enddate", OPT_ENDDATE, '-', "Set notAfter field"},
 124     {"dates", OPT_DATES, '-', "Both Before and After dates"},
 125     {"clrtrust", OPT_CLRTRUST, '-', "Clear all trusted purposes"},
 126     {"clrext", OPT_CLREXT, '-', "Clear all certificate extensions"},
 127     {"addtrust", OPT_ADDTRUST, 's', "Trust certificate for a given purpose"},
 128     {"addreject", OPT_ADDREJECT, 's',
 129      "Reject certificate for a given purpose"},
 130     {"setalias", OPT_SETALIAS, 's', "Set certificate alias"},
 131     {"days", OPT_DAYS, 'n',
 132      "How long till expiry of a signed certificate - def 30 days"},
 133     {"signkey", OPT_SIGNKEY, 's', "Self-sign cert with arg"},
 134     {"set_serial", OPT_SET_SERIAL, 's', "Serial number to use"},
 135     {"extensions", OPT_EXTENSIONS, 's', "Section from config file to use"},
 136     {"certopt", OPT_CERTOPT, 's', "Various certificate text options"},
 137     {"checkhost", OPT_CHECKHOST, 's', "Check certificate matches host"},
 138     {"checkemail", OPT_CHECKEMAIL, 's', "Check certificate matches email"},
 139     {"checkip", OPT_CHECKIP, 's', "Check certificate matches ipaddr"},
 140     {"force_pubkey", OPT_FORCE_PUBKEY, '<', "Force the key to put inside certificate"},
 141     {"subj", OPT_SUBJ, 's', "Set or override certificate subject (and issuer)"},
 142
 143     OPT_SECTION("CA"),
 144     {"CA", OPT_CA, '<', "Set the CA certificate, must be PEM format"},
 145     {"CAkey", OPT_CAKEY, 's',
 146      "The CA key, must be PEM format; if not in CAfile"},
 147     {"extfile", OPT_EXTFILE, '<', "File with X509V3 extensions to add"},
 148     OPT_R_OPTIONS,
 149     OPT_PROV_OPTIONS,
 150     {"CAform", OPT_CAFORM, 'F', "CA cert format (PEM/DER/P12); has no effect"},
 151     {"CAkeyform", OPT_CAKEYFORM, 'E', "CA key format (ENGINE, other values ignored)"},
 152     {"sigopt", OPT_SIGOPT, 's', "Signature parameter in n:v form"},
 153     {"CAcreateserial", OPT_CACREATESERIAL, '-',
 154      "Create serial number file if it does not exist"},
 155     {"CAserial", OPT_CASERIAL, 's', "Serial file"},
 156     {"new", OPT_NEW, '-', "Generate a certificate from scratch"},
 157     {"next_serial", OPT_NEXT_SERIAL, '-', "Increment current certificate serial number"},
 158     {"clrreject", OPT_CLRREJECT, '-',
 159      "Clears all the prohibited or rejected uses of the certificate"},
 160     {"badsig", OPT_BADSIG, '-', "Corrupt last byte of certificate signature (for test)"},
 161     {"", OPT_MD, '-', "Any supported digest"},
 162     {"preserve_dates", OPT_PRESERVE_DATES, '-', "preserve existing dates when signing"},
 163     {NULL}
 164 };
 165
 166 int x509_main(int argc, char **argv)
 167 {
 168     ASN1_INTEGER *sno = NULL;
 169     ASN1_OBJECT *objtmp = NULL;
 170     BIO *out = NULL;
 171     CONF *extconf = NULL;
 172     EVP_PKEY *Upkey = NULL, *CApkey = NULL, *fkey = NULL;
 173     int newcert = 0;
 174     char *subj = NULL;
 175     X509_NAME *fsubj = NULL;
 176     const unsigned long chtype = MBSTRING_ASC;
 177     const int multirdn = 1;
 178     STACK_OF(ASN1_OBJECT) *trust = NULL, *reject = NULL;
 179     STACK_OF(OPENSSL_STRING) *sigopts = NULL, *vfyopts = NULL;
 180     X509 *x = NULL, *xca = NULL;
 181     X509_REQ *req = NULL, *rq = NULL;
 182     X509_STORE *ctx = NULL;
 183     const EVP_MD *digest = NULL;
 184     char *CAkeyfile = NULL, *CAserial = NULL, *fkeyfile = NULL, *alias = NULL;
 185     char *checkhost = NULL, *checkemail = NULL, *checkip = NULL, *exts = NULL;
 186     char *extsect = NULL, *extfile = NULL, *passin = NULL, *passinarg = NULL;
 187     char *infile = NULL, *outfile = NULL, *keyfile = NULL, *CAfile = NULL;
 188     char *prog;
 189     int x509req = 0, days = DEF_DAYS, modulus = 0, pubkey = 0, pprint = 0;
 190     int CAformat = FORMAT_PEM, CAkeyformat = FORMAT_PEM;
 191     int fingerprint = 0, reqfile = 0, checkend = 0;
 192     int informat = FORMAT_PEM, outformat = FORMAT_PEM, keyformat = FORMAT_PEM;
 193     int next_serial = 0, subject_hash = 0, issuer_hash = 0, ocspid = 0;
 194     int noout = 0, sign_flag = 0, CA_flag = 0, CA_createserial = 0, email = 0;
 195     int ocsp_uri = 0, trustout = 0, clrtrust = 0, clrreject = 0, aliasout = 0;
 196     int ret = 1, i, num = 0, badsig = 0, clrext = 0, nocert = 0;
 197     int text = 0, serial = 0, subject = 0, issuer = 0, startdate = 0, ext = 0;
 198     int enddate = 0;
 199     time_t checkoffset = 0;
 200     unsigned long certflag = 0;
 201     int preserve_dates = 0;
 202     OPTION_CHOICE o;
 203     ENGINE *e = NULL;
 204 #ifndef OPENSSL_NO_MD5
 205     int subject_hash_old = 0, issuer_hash_old = 0;
 206 #endif
 207
 208     ctx = X509_STORE_new();
 209     if (ctx == NULL)
 210         goto end;
 211     X509_STORE_set_verify_cb(ctx, callb);
 212
 213     prog = opt_init(argc, argv, x509_options);
 214     while ((o = opt_next()) != OPT_EOF) {
 215         switch (o) {
 216         case OPT_EOF:
 217         case OPT_ERR:
 218  opthelp:
 219             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
 220             goto end;
 221         case OPT_HELP:
 222             opt_help(x509_options);
 223             ret = 0;
 224             goto end;
 225         case OPT_INFORM:
 226             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
 227                 goto opthelp;
 228             break;
 229         case OPT_IN:
 230             infile = opt_arg();
 231             break;
 232         case OPT_OUTFORM:
 233             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
 234                 goto opthelp;
 235             break;
 236         case OPT_KEYFORM:
 237             if (!opt_format(opt_arg(), OPT_FMT_ANY, &keyformat))
 238                 goto opthelp;
 239             break;
 240         case OPT_CAFORM:
 241             if (!opt_format(opt_arg(), OPT_FMT_ANY, &CAformat))
 242                 goto opthelp;
 243             break;
 244         case OPT_CAKEYFORM:
 245             if (!opt_format(opt_arg(), OPT_FMT_ANY, &CAkeyformat))
 246                 goto opthelp;
 247             break;
 248         case OPT_OUT:
 249             outfile = opt_arg();
 250             break;
 251         case OPT_REQ:
 252             reqfile = 1;
 253             break;
 254
 255         case OPT_SIGOPT:
 256             if (!sigopts)
 257                 sigopts = sk_OPENSSL_STRING_new_null();
 258             if (!sigopts || !sk_OPENSSL_STRING_push(sigopts, opt_arg()))
 259                 goto opthelp;
 260             break;
 261         case OPT_VFYOPT:
 262             if (!vfyopts)
 263                 vfyopts = sk_OPENSSL_STRING_new_null();
 264             if (!vfyopts || !sk_OPENSSL_STRING_push(vfyopts, opt_arg()))
 265                 goto opthelp;
 266             break;
 267         case OPT_DAYS:
 268             if (preserve_dates)
 269                 goto opthelp;
 270             days = atoi(opt_arg());
 271             break;
 272         case OPT_PASSIN:
 273             passinarg = opt_arg();
 274             break;
 275         case OPT_EXTFILE:
 276             extfile = opt_arg();
 277             break;
 278         case OPT_R_CASES:
 279             if (!opt_rand(o))
 280                 goto end;
 281             break;
 282         case OPT_PROV_CASES:
 283             if (!opt_provider(o))
 284                 goto end;
 285             break;
 286         case OPT_EXTENSIONS:
 287             extsect = opt_arg();
 288             break;
 289         case OPT_SIGNKEY:
 290             keyfile = opt_arg();
 291             sign_flag = ++num;
 292             break;
 293         case OPT_CA:
 294             CAfile = opt_arg();
 295             CA_flag = ++num;
 296             break;
 297         case OPT_CAKEY:
 298             CAkeyfile = opt_arg();
 299             break;
 300         case OPT_CASERIAL:
 301             CAserial = opt_arg();
 302             break;
 303         case OPT_SET_SERIAL:
 304             if (sno != NULL) {
 305                 BIO_printf(bio_err, "Serial number supplied twice\n");
 306                 goto opthelp;
 307             }
 308             if ((sno = s2i_ASN1_INTEGER(NULL, opt_arg())) == NULL)
 309                 goto opthelp;
 310             break;
 311         case OPT_NEW:
 312             newcert = 1;
 313             break;
 314         case OPT_FORCE_PUBKEY:
 315             fkeyfile = opt_arg();
 316             break;
 317         case OPT_SUBJ:
 318             subj = opt_arg();
 319             break;
 320         case OPT_ADDTRUST:
 321             if ((objtmp = OBJ_txt2obj(opt_arg(), 0)) == NULL) {
 322                 BIO_printf(bio_err,
 323                            "%s: Invalid trust object value %s\n",
 324                            prog, opt_arg());
 325                 goto opthelp;
 326             }
 327             if (trust == NULL && (trust = sk_ASN1_OBJECT_new_null()) == NULL)
 328                 goto end;
 329             sk_ASN1_OBJECT_push(trust, objtmp);
 330             objtmp = NULL;
 331             trustout = 1;
 332             break;
 333         case OPT_ADDREJECT:
 334             if ((objtmp = OBJ_txt2obj(opt_arg(), 0)) == NULL) {
 335                 BIO_printf(bio_err,
 336                            "%s: Invalid reject object value %s\n",
 337                            prog, opt_arg());
 338                 goto opthelp;
 339             }
 340             if (reject == NULL
 341                 && (reject = sk_ASN1_OBJECT_new_null()) == NULL)
 342                 goto end;
 343             sk_ASN1_OBJECT_push(reject, objtmp);
 344             objtmp = NULL;
 345             trustout = 1;
 346             break;
 347         case OPT_SETALIAS:
 348             alias = opt_arg();
 349             trustout = 1;
 350             break;
 351         case OPT_CERTOPT:
 352             if (!set_cert_ex(&certflag, opt_arg()))
 353                 goto opthelp;
 354             break;
 355         case OPT_NAMEOPT:
 356             if (!set_nameopt(opt_arg()))
 357                 goto opthelp;
 358             break;
 359         case OPT_ENGINE:
 360             e = setup_engine(opt_arg(), 0);
 361             break;
 362         case OPT_EMAIL:
 363             email = ++num;
 364             break;
 365         case OPT_OCSP_URI:
 366             ocsp_uri = ++num;
 367             break;
 368         case OPT_SERIAL:
 369             serial = ++num;
 370             break;
 371         case OPT_NEXT_SERIAL:
 372             next_serial = ++num;
 373             break;
 374         case OPT_MODULUS:
 375             modulus = ++num;
 376             break;
 377         case OPT_PUBKEY:
 378             pubkey = ++num;
 379             break;
 380         case OPT_X509TOREQ:
 381             x509req = ++num;
 382             break;
 383         case OPT_TEXT:
 384             text = ++num;
 385             break;
 386         case OPT_SUBJECT:
 387             subject = ++num;
 388             break;
 389         case OPT_ISSUER:
 390             issuer = ++num;
 391             break;
 392         case OPT_FINGERPRINT:
 393             fingerprint = ++num;
 394             break;
 395         case OPT_HASH:
 396             subject_hash = ++num;
 397             break;
 398         case OPT_ISSUER_HASH:
 399             issuer_hash = ++num;
 400             break;
 401         case OPT_PURPOSE:
 402             pprint = ++num;
 403             break;
 404         case OPT_STARTDATE:
 405             startdate = ++num;
 406             break;
 407         case OPT_ENDDATE:
 408             enddate = ++num;
 409             break;
 410         case OPT_NOOUT:
 411             noout = ++num;
 412             break;
 413         case OPT_EXT:
 414             ext = ++num;
 415             exts = opt_arg();
 416             break;
 417         case OPT_NOCERT:
 418             nocert = 1;
 419             break;
 420         case OPT_TRUSTOUT:
 421             trustout = 1;
 422             break;
 423         case OPT_CLRTRUST:
 424             clrtrust = ++num;
 425             break;
 426         case OPT_CLRREJECT:
 427             clrreject = ++num;
 428             break;
 429         case OPT_ALIAS:
 430             aliasout = ++num;
 431             break;
 432         case OPT_CACREATESERIAL:
 433             CA_createserial = ++num;
 434             break;
 435         case OPT_CLREXT:
 436             clrext = 1;
 437             break;
 438         case OPT_OCSPID:
 439             ocspid = ++num;
 440             break;
 441         case OPT_BADSIG:
 442             badsig = 1;
 443             break;
 444 #ifndef OPENSSL_NO_MD5
 445         case OPT_SUBJECT_HASH_OLD:
 446             subject_hash_old = ++num;
 447             break;
 448         case OPT_ISSUER_HASH_OLD:
 449             issuer_hash_old = ++num;
 450             break;
 451 #else
 452         case OPT_SUBJECT_HASH_OLD:
 453         case OPT_ISSUER_HASH_OLD:
 454             break;
 455 #endif
 456         case OPT_DATES:
 457             startdate = ++num;
 458             enddate = ++num;
 459             break;
 460         case OPT_CHECKEND:
 461             checkend = 1;
 462             {
 463                 intmax_t temp = 0;
 464                 if (!opt_imax(opt_arg(), &temp))
 465                     goto opthelp;
 466                 checkoffset = (time_t)temp;
 467                 if ((intmax_t)checkoffset != temp) {
 468                     BIO_printf(bio_err, "%s: checkend time out of range %s\n",
 469                                prog, opt_arg());
 470                     goto opthelp;
 471                 }
 472             }
 473             break;
 474         case OPT_CHECKHOST:
 475             checkhost = opt_arg();
 476             break;
 477         case OPT_CHECKEMAIL:
 478             checkemail = opt_arg();
 479             break;
 480         case OPT_CHECKIP:
 481             checkip = opt_arg();
 482             break;
 483         case OPT_PRESERVE_DATES:
 484             if (days != DEF_DAYS)
 485                 goto opthelp;
 486             preserve_dates = 1;
 487             break;
 488         case OPT_MD:
 489             if (!opt_md(opt_unknown(), &digest))
 490                 goto opthelp;
 491         }
 492     }
 493     argc = opt_num_rest();
 494     argv = opt_rest();
 495     if (argc != 0) {
 496         BIO_printf(bio_err, "%s: Unknown parameter %s\n", prog, argv[0]);
 497         goto opthelp;
 498     }
 499
 500     if (!app_passwd(passinarg, NULL, &passin, NULL)) {
 501         BIO_printf(bio_err, "Error getting password\n");
 502         goto end;
 503     }
 504
 505     if (!X509_STORE_set_default_paths_ex(ctx, app_get0_libctx(),
 506                                          app_get0_propq())) {
 507         ERR_print_errors(bio_err);
 508         goto end;
 509     }
 510
 511     if (newcert && infile != NULL) {
 512         BIO_printf(bio_err, "The -in option must not be used since -new is set\n");
 513         goto end;
 514     }
 515     if (newcert && fkeyfile == NULL) {
 516         BIO_printf(bio_err,
 517                    "The -new option requires a public key to be set using -force_pubkey\n");
 518         goto end;
 519     }
 520     if (fkeyfile != NULL) {
 521         fkey = load_pubkey(fkeyfile, keyformat, 0, NULL, e, "forced key");
 522         if (fkey == NULL)
 523             goto end;
 524     }
 525
 526     if (newcert && subj == NULL) {
 527         BIO_printf(bio_err,
 528                    "The -new option requires a subject to be set using -subj\n");
 529         goto end;
 530     }
 531     if (subj != NULL
 532             && (fsubj = parse_name(subj, chtype, multirdn, "subject")) == NULL)
 533         goto end;
 534
 535     if (CAkeyfile == NULL && CA_flag && CAformat == FORMAT_PEM) {
 536         CAkeyfile = CAfile;
 537     } else if (CA_flag && CAkeyfile == NULL) {
 538         BIO_printf(bio_err,
 539                    "need to specify a CAkey if using the CA command\n");
 540         goto end;
 541     } else if (!CA_flag && CAkeyfile != NULL) {
 542         BIO_printf(bio_err,
 543                    "ignoring -CAkey option since no -CA option is given\n");
 544     }
 545
 546     if (extfile != NULL) {
 547         X509V3_CTX ctx2;
 548         if ((extconf = app_load_config(extfile)) == NULL)
 549             goto end;
 550         if (extsect == NULL) {
 551             extsect = NCONF_get_string(extconf, "default", "extensions");
 552             if (extsect == NULL) {
 553                 ERR_clear_error();
 554                 extsect = "default";
 555             }
 556         }
 557         X509V3_set_ctx_test(&ctx2);
 558         X509V3_set_nconf(&ctx2, extconf);
 559         if (!X509V3_EXT_add_nconf(extconf, &ctx2, extsect, NULL)) {
 560             BIO_printf(bio_err,
 561                        "Error Loading extension section %s\n", extsect);
 562             ERR_print_errors(bio_err);
 563             goto end;
 564         }
 565     }
 566
 567     if (reqfile) {
 568         EVP_PKEY *pkey;
 569
 570         req = load_csr(infile, informat, "certificate request input");
 571         if (req == NULL)
 572             goto end;
 573
 574         if ((pkey = X509_REQ_get0_pubkey(req)) == NULL) {
 575             BIO_printf(bio_err, "error unpacking public key\n");
 576             goto end;
 577         }
 578         i = do_X509_REQ_verify(req, pkey, vfyopts);
 579         if (i < 0) {
 580             BIO_printf(bio_err, "Request self-signature verification error\n");
 581             ERR_print_errors(bio_err);
 582             goto end;
 583         }
 584         if (i == 0) {
 585             BIO_printf(bio_err,
 586                        "Request self-signature did not match the certificate request\n");
 587             goto end;
 588         } else {
 589             BIO_printf(bio_err, "Request self-signature ok\n");
 590         }
 591
 592         print_name(bio_err, "subject=", X509_REQ_get_subject_name(req),
 593                    get_nameopt());
 594     }
 595
 596     if (reqfile || newcert) {
 597         X509_NAME *n;
 598
 599         if (!sign_flag && CAkeyfile == NULL) {
 600             BIO_printf(bio_err,
 601                        "We need a private key to sign with, use -signkey or -CAkey or -CA <file> with private key\n");
 602             goto end;
 603         }
 604         if ((x = X509_new_ex(app_get0_libctx(), app_get0_propq())) == NULL)
 605             goto end;
 606
 607         if (sno == NULL) {
 608             sno = ASN1_INTEGER_new();
 609             if (sno == NULL || !rand_serial(NULL, sno))
 610                 goto end;
 611             if (!X509_set_serialNumber(x, sno))
 612                 goto end;
 613             ASN1_INTEGER_free(sno);
 614             sno = NULL;
 615         } else if (!X509_set_serialNumber(x, sno)) {
 616             goto end;
 617         }
 618
 619         n = req == NULL ? fsubj : X509_REQ_get_subject_name(req);
 620         if (!X509_set_issuer_name(x, n) || !X509_set_subject_name(x, n))
 621             goto end;
 622         if (!set_cert_times(x, NULL, NULL, days))
 623             goto end;
 624
 625         if (!X509_set_pubkey(x, fkey != NULL ? fkey : X509_REQ_get0_pubkey(req)))
 626             goto end;
 627     } else {
 628         x = load_cert_pass(infile, 1, passin, "certificate");
 629         if (x == NULL)
 630             goto end;
 631         if (fkey != NULL && !X509_set_pubkey(x, fkey))
 632             goto end;
 633         if (fsubj != NULL && !X509_set_subject_name(x, fsubj))
 634             goto end;
 635     }
 636
 637     if (CA_flag) {
 638         xca = load_cert_pass(CAfile, 1, passin, "CA certificate");
 639         if (xca == NULL)
 640             goto end;
 641     }
 642
 643     out = bio_open_default(outfile, 'w', outformat);
 644     if (out == NULL)
 645         goto end;
 646
 647     if (!noout || text || next_serial)
 648         OBJ_create("2.99999.3", "SET.ex3", "SET x509v3 extension 3");
 649
 650     if (alias)
 651         X509_alias_set1(x, (unsigned char *)alias, -1);
 652
 653     if (clrtrust)
 654         X509_trust_clear(x);
 655     if (clrreject)
 656         X509_reject_clear(x);
 657
 658     if (trust != NULL) {
 659         for (i = 0; i < sk_ASN1_OBJECT_num(trust); i++) {
 660             objtmp = sk_ASN1_OBJECT_value(trust, i);
 661             X509_add1_trust_object(x, objtmp);
 662         }
 663         objtmp = NULL;
 664     }
 665
 666     if (reject != NULL) {
 667         for (i = 0; i < sk_ASN1_OBJECT_num(reject); i++) {
 668             objtmp = sk_ASN1_OBJECT_value(reject, i);
 669             X509_add1_reject_object(x, objtmp);
 670         }
 671         objtmp = NULL;
 672     }
 673
 674     if (badsig) {
 675         const ASN1_BIT_STRING *signature;
 676
 677         X509_get0_signature(&signature, NULL, x);
 678         corrupt_signature(signature);
 679     }
 680
 681     if (num) {
 682         for (i = 1; i <= num; i++) {
 683             if (issuer == i) {
 684                 print_name(out, "issuer=", X509_get_issuer_name(x), get_nameopt());
 685             } else if (subject == i) {
 686                 print_name(out, "subject=",
 687                            X509_get_subject_name(x), get_nameopt());
 688             } else if (serial == i) {
 689                 BIO_printf(out, "serial=");
 690                 i2a_ASN1_INTEGER(out, X509_get0_serialNumber(x));
 691                 BIO_printf(out, "\n");
 692             } else if (next_serial == i) {
 693                 ASN1_INTEGER *ser = X509_get_serialNumber(x);
 694                 BIGNUM *bnser = ASN1_INTEGER_to_BN(ser, NULL);
 695
 696                 if (!bnser)
 697                     goto end;
 698                 if (!BN_add_word(bnser, 1))
 699                     goto end;
 700                 ser = BN_to_ASN1_INTEGER(bnser, NULL);
 701                 if (!ser)
 702                     goto end;
 703                 BN_free(bnser);
 704                 i2a_ASN1_INTEGER(out, ser);
 705                 ASN1_INTEGER_free(ser);
 706                 BIO_puts(out, "\n");
 707             } else if (email == i || ocsp_uri == i) {
 708                 int j;
 709                 STACK_OF(OPENSSL_STRING) *emlst;
 710                 if (email == i)
 711                     emlst = X509_get1_email(x);
 712                 else
 713                     emlst = X509_get1_ocsp(x);
 714                 for (j = 0; j < sk_OPENSSL_STRING_num(emlst); j++)
 715                     BIO_printf(out, "%s\n",
 716                                sk_OPENSSL_STRING_value(emlst, j));
 717                 X509_email_free(emlst);
 718             } else if (aliasout == i) {
 719                 unsigned char *alstr;
 720                 alstr = X509_alias_get0(x, NULL);
 721                 if (alstr)
 722                     BIO_printf(out, "%s\n", alstr);
 723                 else
 724                     BIO_puts(out, "<No Alias>\n");
 725             } else if (subject_hash == i) {
 726                 BIO_printf(out, "%08lx\n", X509_subject_name_hash(x));
 727             }
 728 #ifndef OPENSSL_NO_MD5
 729             else if (subject_hash_old == i) {
 730                 BIO_printf(out, "%08lx\n", X509_subject_name_hash_old(x));
 731             }
 732 #endif
 733             else if (issuer_hash == i) {
 734                 BIO_printf(out, "%08lx\n", X509_issuer_name_hash(x));
 735             }
 736 #ifndef OPENSSL_NO_MD5
 737             else if (issuer_hash_old == i) {
 738                 BIO_printf(out, "%08lx\n", X509_issuer_name_hash_old(x));
 739             }
 740 #endif
 741             else if (pprint == i) {
 742                 X509_PURPOSE *ptmp;
 743                 int j;
 744                 BIO_printf(out, "Certificate purposes:\n");
 745                 for (j = 0; j < X509_PURPOSE_get_count(); j++) {
 746                     ptmp = X509_PURPOSE_get0(j);
 747                     purpose_print(out, x, ptmp);
 748                 }
 749             } else if (modulus == i) {
 750                 EVP_PKEY *pkey;
 751
 752                 pkey = X509_get0_pubkey(x);
 753                 if (pkey == NULL) {
 754                     BIO_printf(bio_err, "Modulus=unavailable\n");
 755                     ERR_print_errors(bio_err);
 756                     goto end;
 757                 }
 758                 BIO_printf(out, "Modulus=");
 759 #ifndef OPENSSL_NO_RSA
 760                 if (EVP_PKEY_is_a(pkey, "RSA")) {
 761                     BIGNUM *n;
 762
 763                     /* Every RSA key has an 'n' */
 764                     EVP_PKEY_get_bn_param(pkey, "n", &n);
 765                     BN_print(out, n);
 766                     BN_free(n);
 767                 } else
 768 #endif
 769 #ifndef OPENSSL_NO_DSA
 770                 if (EVP_PKEY_id(pkey) == EVP_PKEY_DSA) {
 771                     const BIGNUM *dsapub = NULL;
 772                     DSA_get0_key(EVP_PKEY_get0_DSA(pkey), &dsapub, NULL);
 773                     BN_print(out, dsapub);
 774                 } else
 775 #endif
 776                 {
 777                     BIO_printf(out, "Wrong Algorithm type");
 778                 }
 779                 BIO_printf(out, "\n");
 780             } else if (pubkey == i) {
 781                 EVP_PKEY *pkey;
 782
 783                 pkey = X509_get0_pubkey(x);
 784                 if (pkey == NULL) {
 785                     BIO_printf(bio_err, "Error getting public key\n");
 786                     ERR_print_errors(bio_err);
 787                     goto end;
 788                 }
 789                 PEM_write_bio_PUBKEY(out, pkey);
 790             } else if (text == i) {
 791                 X509_print_ex(out, x, get_nameopt(), certflag);
 792             } else if (startdate == i) {
 793                 BIO_puts(out, "notBefore=");
 794                 ASN1_TIME_print(out, X509_get0_notBefore(x));
 795                 BIO_puts(out, "\n");
 796             } else if (enddate == i) {
 797                 BIO_puts(out, "notAfter=");
 798                 ASN1_TIME_print(out, X509_get0_notAfter(x));
 799                 BIO_puts(out, "\n");
 800             } else if (fingerprint == i) {
 801                 int j;
 802                 unsigned int n;
 803                 unsigned char md[EVP_MAX_MD_SIZE];
 804                 const EVP_MD *fdig = digest;
 805
 806                 if (fdig == NULL)
 807                     fdig = EVP_sha1();
 808
 809                 if (!X509_digest(x, fdig, md, &n)) {
 810                     BIO_printf(bio_err, "out of memory\n");
 811                     goto end;
 812                 }
 813                 BIO_printf(out, "%s Fingerprint=",
 814                            OBJ_nid2sn(EVP_MD_type(fdig)));
 815                 for (j = 0; j < (int)n; j++) {
 816                     BIO_printf(out, "%02X%c", md[j], (j + 1 == (int)n)
 817                                ? '\n' : ':');
 818                 }
 819             }
 820
 821             /* should be in the library */
 822             else if (sign_flag == i && x509req == 0) {
 823                 BIO_printf(bio_err, "Getting Private key\n");
 824                 if (Upkey == NULL) {
 825                     Upkey = load_key(keyfile, keyformat, 0,
 826                                      passin, e, "private key");
 827                     if (Upkey == NULL)
 828                         goto end;
 829                 }
 830
 831                 if (!sign(x, Upkey, fkey, sigopts, days, clrext, digest,
 832                           extconf, extsect, preserve_dates))
 833                     goto end;
 834             } else if (CA_flag == i) {
 835                 BIO_printf(bio_err, "Getting CA Private Key\n");
 836                 if (CAkeyfile != NULL) {
 837                     CApkey = load_key(CAkeyfile, CAkeyformat,
 838                                       0, passin, e, "CA private key");
 839                     if (CApkey == NULL)
 840                         goto end;
 841                 }
 842
 843                 if (!x509_certify(ctx, CAfile, digest, x, xca,
 844                                   CApkey, sigopts,
 845                                   CAserial, CA_createserial, days, clrext,
 846                                   extconf, extsect, sno, reqfile, preserve_dates))
 847                     goto end;
 848             } else if (x509req == i) {
 849                 EVP_PKEY *pk;
 850
 851                 BIO_printf(bio_err, "Getting request Private Key\n");
 852                 if (keyfile == NULL) {
 853                     BIO_printf(bio_err, "no request key file specified\n");
 854                     goto end;
 855                 } else {
 856                     pk = load_key(keyfile, keyformat, 0,
 857                                   passin, e, "request key");
 858                     if (pk == NULL)
 859                         goto end;
 860                 }
 861
 862                 BIO_printf(bio_err, "Generating certificate request\n");
 863
 864                 rq = X509_to_X509_REQ(x, pk, digest);
 865                 EVP_PKEY_free(pk);
 866                 if (rq == NULL) {
 867                     ERR_print_errors(bio_err);
 868                     goto end;
 869                 }
 870                 if (!noout) {
 871                     X509_REQ_print_ex(out, rq, get_nameopt(), X509_FLAG_COMPAT);
 872                     PEM_write_bio_X509_REQ(out, rq);
 873                 }
 874                 noout = 1;
 875             } else if (ocspid == i) {
 876                 X509_ocspid_print(out, x);
 877             } else if (ext == i) {
 878                 print_x509v3_exts(out, x, exts);
 879             }
 880         }
 881     }
 882
 883     if (checkend) {
 884         time_t tcheck = time(NULL) + checkoffset;
 885
 886         if (X509_cmp_time(X509_get0_notAfter(x), &tcheck) < 0) {
 887             BIO_printf(out, "Certificate will expire\n");
 888             ret = 1;
 889         } else {
 890             BIO_printf(out, "Certificate will not expire\n");
 891             ret = 0;
 892         }
 893         goto end;
 894     }
 895
 896     print_cert_checks(out, x, checkhost, checkemail, checkip);
 897
 898     if (noout || nocert) {
 899         ret = 0;
 900         goto end;
 901     }
 902
 903     if (outformat == FORMAT_ASN1) {
 904         i = i2d_X509_bio(out, x);
 905     } else if (outformat == FORMAT_PEM) {
 906         if (trustout)
 907             i = PEM_write_bio_X509_AUX(out, x);
 908         else
 909             i = PEM_write_bio_X509(out, x);
 910     } else {
 911         BIO_printf(bio_err, "bad output format specified for outfile\n");
 912         goto end;
 913     }
 914     if (!i) {
 915         BIO_printf(bio_err, "unable to write certificate\n");
 916         ERR_print_errors(bio_err);
 917         goto end;
 918     }
 919     ret = 0;
 920  end:
 921     NCONF_free(extconf);
 922     BIO_free_all(out);
 923     X509_STORE_free(ctx);
 924     X509_NAME_free(fsubj);
 925     X509_REQ_free(req);
 926     X509_free(x);
 927     X509_free(xca);
 928     EVP_PKEY_free(Upkey);
 929     EVP_PKEY_free(CApkey);
 930     EVP_PKEY_free(fkey);
 931     sk_OPENSSL_STRING_free(sigopts);
 932     sk_OPENSSL_STRING_free(vfyopts);
 933     X509_REQ_free(rq);
 934     ASN1_INTEGER_free(sno);
 935     sk_ASN1_OBJECT_pop_free(trust, ASN1_OBJECT_free);
 936     sk_ASN1_OBJECT_pop_free(reject, ASN1_OBJECT_free);
 937     ASN1_OBJECT_free(objtmp);
 938     release_engine(e);
 939     clear_free(passin);
 940     return ret;
 941 }
 942
 943 static ASN1_INTEGER *x509_load_serial(const char *CAfile,
 944                                       const char *serialfile, int create)
 945 {
 946     char *buf = NULL;
 947     ASN1_INTEGER *bs = NULL;
 948     BIGNUM *serial = NULL;
 949
 950     if (serialfile == NULL) {
 951         const char *p = strrchr(CAfile, '.');
 952         size_t len = p != NULL ? (size_t)(p - CAfile) : strlen(CAfile);
 953
 954         buf = app_malloc(len + sizeof(POSTFIX), "serial# buffer");
 955         memcpy(buf, CAfile, len);
 956         memcpy(buf + len, POSTFIX, sizeof(POSTFIX));
 957         serialfile = buf;
 958     }
 959
 960     serial = load_serial(serialfile, create, NULL);
 961     if (serial == NULL)
 962         goto end;
 963
 964     if (!BN_add_word(serial, 1)) {
 965         BIO_printf(bio_err, "add_word failure\n");
 966         goto end;
 967     }
 968
 969     if (!save_serial(serialfile, NULL, serial, &bs))
 970         goto end;
 971
 972  end:
 973     OPENSSL_free(buf);
 974     BN_free(serial);
 975     return bs;
 976 }
 977
 978 static int x509_certify(X509_STORE *ctx, const char *CAfile, const EVP_MD *digest,
 979                         X509 *x, X509 *xca, EVP_PKEY *pkey,
 980                         STACK_OF(OPENSSL_STRING) *sigopts,
 981                         const char *serialfile, int create,
 982                         int days, int clrext, CONF *conf, const char *section,
 983                         ASN1_INTEGER *sno, int reqfile, int preserve_dates)
 984 {
 985     int ret = 0;
 986     ASN1_INTEGER *bs = NULL;
 987     X509_STORE_CTX *xsc = NULL;
 988     EVP_PKEY *upkey;
 989
 990     upkey = X509_get0_pubkey(xca);
 991     if (upkey == NULL) {
 992         BIO_printf(bio_err, "Error obtaining CA X509 public key\n");
 993         goto end;
 994     }
 995     EVP_PKEY_copy_parameters(upkey, pkey);
 996
 997     xsc = X509_STORE_CTX_new();
 998     if (xsc == NULL || !X509_STORE_CTX_init(xsc, ctx, x, NULL)) {
 999         BIO_printf(bio_err, "Error initialising X509 store\n");
1000         goto end;
1001     }
1002     if (sno)
1003         bs = sno;
1004     else if ((bs = x509_load_serial(CAfile, serialfile, create)) == NULL)
1005         goto end;
1006
1007     /*
1008      * NOTE: this certificate can/should be self-signed, unless it was a
1009      * certificate request in which case it is not.
1010      */
1011     X509_STORE_CTX_set_cert(xsc, x);
1012     X509_STORE_CTX_set_flags(xsc, X509_V_FLAG_CHECK_SS_SIGNATURE);
1013     if (!reqfile && X509_verify_cert(xsc) <= 0)
1014         goto end;
1015
1016     if (!X509_check_private_key(xca, pkey)) {
1017         BIO_printf(bio_err,
1018                    "CA certificate and CA private key do not match\n");
1019         goto end;
1020     }
1021
1022     if (!X509_set_issuer_name(x, X509_get_subject_name(xca)))
1023         goto end;
1024     if (!X509_set_serialNumber(x, bs))
1025         goto end;
1026
1027     if (!preserve_dates && !set_cert_times(x, NULL, NULL, days))
1028         goto end;
1029
1030     if (clrext) {
1031         while (X509_get_ext_count(x) > 0)
1032             X509_delete_ext(x, 0);
1033     }
1034
1035     if (conf != NULL) {
1036         X509V3_CTX ctx2;
1037         X509_set_version(x, 2); /* version 3 certificate */
1038         X509V3_set_ctx(&ctx2, xca, x, NULL, NULL, 0);
1039         X509V3_set_nconf(&ctx2, conf);
1040         if (!X509V3_EXT_add_nconf(conf, &ctx2, section, x))
1041             goto end;
1042     }
1043
1044     if (!do_X509_sign(x, pkey, digest, sigopts))
1045         goto end;
1046     ret = 1;
1047  end:
1048     X509_STORE_CTX_free(xsc);
1049     if (!ret)
1050         ERR_print_errors(bio_err);
1051     if (!sno)
1052         ASN1_INTEGER_free(bs);
1053     return ret;
1054 }
1055
1056 static int callb(int ok, X509_STORE_CTX *ctx)
1057 {
1058     int err;
1059     X509 *err_cert;
1060
1061     /*
1062      * It is ok to use a self-signed certificate. This case will catch both
1063      * the initial ok == 0 and the final ok == 1 calls to this function.
1064      */
1065     err = X509_STORE_CTX_get_error(ctx);
1066     if (err == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
1067         return 1;
1068
1069     /*
1070      * BAD we should have gotten an error.  Normally if everything worked
1071      * X509_STORE_CTX_get_error(ctx) will still be set to
1072      * DEPTH_ZERO_SELF_....
1073      */
1074     if (ok) {
1075         BIO_printf(bio_err,
1076                    "error with certificate to be certified - should be self-signed\n");
1077         return 0;
1078     } else {
1079         err_cert = X509_STORE_CTX_get_current_cert(ctx);
1080         print_name(bio_err, NULL, X509_get_subject_name(err_cert), 0);
1081         BIO_printf(bio_err,
1082                    "error with certificate - error %d at depth %d\n%s\n", err,
1083                    X509_STORE_CTX_get_error_depth(ctx),
1084                    X509_verify_cert_error_string(err));
1085         return 1;
1086     }
1087 }
1088
1089 /* self-issue; self-sign unless a forced public key (fkey) is given */
1090 static int sign(X509 *x, EVP_PKEY *pkey, EVP_PKEY *fkey,
1091                 STACK_OF(OPENSSL_STRING) *sigopts,
1092                 int days, int clrext,
1093                 const EVP_MD *digest, CONF *conf, const char *section,
1094                 int preserve_dates)
1095 {
1096     if (!X509_set_issuer_name(x, X509_get_subject_name(x)))
1097         goto err;
1098     if (!preserve_dates && !set_cert_times(x, NULL, NULL, days))
1099         goto err;
1100     if (fkey == NULL && !X509_set_pubkey(x, pkey))
1101         goto err;
1102     if (clrext) {
1103         while (X509_get_ext_count(x) > 0)
1104             X509_delete_ext(x, 0);
1105     }
1106     if (conf != NULL) {
1107         X509V3_CTX ctx;
1108         X509_set_version(x, 2); /* version 3 certificate */
1109         X509V3_set_ctx(&ctx, x, x, NULL, NULL, 0);
1110         X509V3_set_nconf(&ctx, conf);
1111         if (!X509V3_EXT_add_nconf(conf, &ctx, section, x))
1112             goto err;
1113     }
1114     if (!do_X509_sign(x, pkey, digest, sigopts))
1115         goto err;
1116     return 1;
1117  err:
1118     ERR_print_errors(bio_err);
1119     return 0;
1120 }
1121
1122 static int purpose_print(BIO *bio, X509 *cert, X509_PURPOSE *pt)
1123 {
1124     int id, i, idret;
1125     const char *pname;
1126     id = X509_PURPOSE_get_id(pt);
1127     pname = X509_PURPOSE_get0_name(pt);
1128     for (i = 0; i < 2; i++) {
1129         idret = X509_check_purpose(cert, id, i);
1130         BIO_printf(bio, "%s%s : ", pname, i ? " CA" : "");
1131         if (idret == 1)
1132             BIO_printf(bio, "Yes\n");
1133         else if (idret == 0)
1134             BIO_printf(bio, "No\n");
1135         else
1136             BIO_printf(bio, "Yes (WARNING code=%d)\n", idret);
1137     }
1138     return 1;
1139 }
1140
1141 static int parse_ext_names(char *names, const char **result)
1142 {
1143     char *p, *q;
1144     int cnt = 0, len = 0;
1145
1146     p = q = names;
1147     len = strlen(names);
1148
1149     while (q - names <= len) {
1150         if (*q != ',' && *q != '\0') {
1151             q++;
1152             continue;
1153         }
1154         if (p != q) {
1155             /* found */
1156             if (result != NULL) {
1157                 result[cnt] = p;
1158                 *q = '\0';
1159             }
1160             cnt++;
1161         }
1162         p = ++q;
1163     }
1164
1165     return cnt;
1166 }
1167
1168 static int print_x509v3_exts(BIO *bio, X509 *x, const char *ext_names)
1169 {
1170     const STACK_OF(X509_EXTENSION) *exts = NULL;
1171     STACK_OF(X509_EXTENSION) *exts2 = NULL;
1172     X509_EXTENSION *ext = NULL;
1173     ASN1_OBJECT *obj;
1174     int i, j, ret = 0, num, nn = 0;
1175     const char *sn, **names = NULL;
1176     char *tmp_ext_names = NULL;
1177
1178     exts = X509_get0_extensions(x);
1179     if ((num = sk_X509_EXTENSION_num(exts)) <= 0) {
1180         BIO_printf(bio, "No extensions in certificate\n");
1181         ret = 1;
1182         goto end;
1183     }
1184
1185     /* parse comma separated ext name string */
1186     if ((tmp_ext_names = OPENSSL_strdup(ext_names)) == NULL)
1187         goto end;
1188     if ((nn = parse_ext_names(tmp_ext_names, NULL)) == 0) {
1189         BIO_printf(bio, "Invalid extension names: %s\n", ext_names);
1190         goto end;
1191     }
1192     if ((names = OPENSSL_malloc(sizeof(char *) * nn)) == NULL)
1193         goto end;
1194     parse_ext_names(tmp_ext_names, names);
1195
1196     for (i = 0; i < num; i++) {
1197         ext = sk_X509_EXTENSION_value(exts, i);
1198
1199         /* check if this ext is what we want */
1200         obj = X509_EXTENSION_get_object(ext);
1201         sn = OBJ_nid2sn(OBJ_obj2nid(obj));
1202         if (sn == NULL || strcmp(sn, "UNDEF") == 0)
1203             continue;
1204
1205         for (j = 0; j < nn; j++) {
1206             if (strcmp(sn, names[j]) == 0) {
1207                 /* push the extension into a new stack */
1208                 if (exts2 == NULL
1209                     && (exts2 = sk_X509_EXTENSION_new_null()) == NULL)
1210                     goto end;
1211                 if (!sk_X509_EXTENSION_push(exts2, ext))
1212                     goto end;
1213             }
1214         }
1215     }
1216
1217     if (!sk_X509_EXTENSION_num(exts2)) {
1218         BIO_printf(bio, "No extensions matched with %s\n", ext_names);
1219         ret = 1;
1220         goto end;
1221     }
1222
1223     ret = X509V3_extensions_print(bio, NULL, exts2, 0, 0);
1224  end:
1225     sk_X509_EXTENSION_free(exts2);
1226     OPENSSL_free(names);
1227     OPENSSL_free(tmp_ext_names);
1228     return ret;
1229 }