src/openac/openac.c

   1 /**
   2  * @file openac.c
   3  *
   4  * @brief Generation of X.509 attribute certificates.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2002  Ueli Galizzi, Ariane Seiler
  10  * Copyright (C) 2004,2007  Andreas Steffen
  11  * Hochschule fuer Technik Rapperswil, Switzerland
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the
  15  * Free Software Foundation; either version 2 of the License, or (at your
  16  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  21  * for more details.
  22  *
  23  * RCSID $Id$
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <syslog.h>
  30 #include <unistd.h>
  31 #include <getopt.h>
  32 #include <ctype.h>
  33 #include <time.h>
  34 #include <gmp.h>
  35
  36 #include <debug.h>
  37 #include <asn1/asn1.h>
  38 #include <asn1/ttodata.h>
  39 #include <crypto/ac.h>
  40 #include <crypto/ietf_attr_list.h>
  41 #include <utils/optionsfrom.h>
  42
  43 #ifdef INTEGRITY_TEST
  44 #include <fips/fips.h>
  45 #include <fips_signature.h>
  46 #endif /* INTEGRITY_TEST */
  47
  48 #include "build.h"
  49
  50 #define OPENAC_PATH   IPSEC_CONFDIR "/openac"
  51 #define OPENAC_SERIAL IPSEC_CONFDIR "/openac/serial"
  52
  53 static void usage(const char *mess)
  54 {
  55         if (mess != NULL && *mess != '\0')
  56         {
  57                 fprintf(stderr, "%s\n", mess);
  58         }
  59         fprintf(stderr, "Usage: openac"
  60                 " [--help]"
  61                 " [--version]"
  62                 " [--optionsfrom <filename>]"
  63                 " [--quiet]"
  64                 " \\\n\t"
  65                 "      [--debug <level 0..4>]"
  66                 " \\\n\t"
  67                 "      [--days <days>]"
  68                 " [--hours <hours>]"
  69                 " \\\n\t"
  70                 "      [--startdate <YYYYMMDDHHMMSSZ>]"
  71                 " [--enddate <YYYYMMDDHHMMSSZ>]"
  72                 " \\\n\t"
  73                 "      --cert <certfile>"
  74                 " --key <keyfile>"
  75                 " [--password <password>]"
  76                 " \\\n\t"
  77                 "      --usercert <certfile>"
  78                 " --groups <attr1,attr2,..>"
  79                 " --out <filename>"
  80                 "\n"
  81         );
  82 }
  83
  84
  85 /**
  86  * convert a chunk into a multi-precision integer
  87  */
  88 static void chunk_to_mpz(chunk_t chunk, mpz_t number)
  89 {
  90         mpz_import(number, chunk.len, 1, 1, 1, 0, chunk.ptr);
  91 }
  92
  93 /**
  94  * convert a multi-precision integer into a chunk
  95  */
  96 static chunk_t mpz_to_chunk(mpz_t number)
  97 {
  98         chunk_t chunk;
  99
 100         chunk.len = 1 + mpz_sizeinbase(number, 2)/BITS_PER_BYTE;
 101         chunk.ptr = mpz_export(NULL, NULL, 1, chunk.len, 1, 0, number);
 102         return chunk;
 103 }
 104
 105 /**
 106  * read the last serial number from file
 107  */
 108 static chunk_t read_serial(void)
 109 {
 110         mpz_t number;
 111
 112         char buf[BUF_LEN], buf1[BUF_LEN];
 113         chunk_t last_serial = { buf1, BUF_LEN};
 114         chunk_t serial;
 115
 116         FILE *fd = fopen(OPENAC_SERIAL, "r");
 117
 118         /* last serial number defaults to 0 */
 119         *last_serial.ptr = 0x00;
 120         last_serial.len = 1;
 121
 122         if (fd)
 123         {
 124                 if (fscanf(fd, "%s", buf))
 125                 {
 126                         err_t ugh = ttodata(buf, 0, 16, last_serial.ptr, BUF_LEN, &last_serial.len);
 127
 128                         if (ugh != NULL)
 129                         {
 130                                 DBG1("  error reading serial number from %s: %s",
 131                                  OPENAC_SERIAL, ugh);
 132                         }
 133                 }
 134                 fclose(fd);
 135         }
 136         else
 137         {
 138                 DBG1("  file '%s' does not exist yet - serial number set to 01", OPENAC_SERIAL);
 139         }
 140
 141         /**
 142          * conversion of read serial number to a multiprecision integer
 143          * and incrementing it by one
 144          * and representing it as a two's complement octet string
 145          */
 146         mpz_init(number);
 147         chunk_to_mpz(last_serial, number);
 148         mpz_add_ui(number, number, 0x01);
 149         serial = mpz_to_chunk(number);
 150         mpz_clear(number);
 151
 152         return serial;
 153 }
 154
 155 /**
 156  * write back the last serial number to file
 157  */
 158 static void write_serial(chunk_t serial)
 159 {
 160         FILE *fd = fopen(OPENAC_SERIAL, "w");
 161
 162         if (fd)
 163         {
 164                 DBG1("  serial number is %#B", &serial);
 165                 fprintf(fd, "%#B\n", &serial);
 166                 fclose(fd);
 167         }
 168         else
 169         {
 170                 DBG1("  could not open file '%s' for writing", OPENAC_SERIAL);
 171         }
 172 }
 173
 174 /**
 175  * global variables accessible by both main() and build.c
 176  */
 177 x509_t *usercert   = NULL;
 178 x509_t *signercert = NULL;
 179
 180 linked_list_t *groups = NULL;
 181 rsa_private_key_t *signerkey = NULL;
 182
 183 time_t notBefore = UNDEFINED_TIME;
 184 time_t notAfter = UNDEFINED_TIME;
 185
 186 chunk_t serial;
 187
 188 static int debug_level = 1;
 189 static bool stderr_quiet = FALSE;
 190 /**
 191  * openac dbg function
 192  */
 193 static void openac_dbg(int level, char *fmt, ...)
 194 {
 195         int priority = LOG_INFO;
 196         va_list args;
 197
 198         if (level <= debug_level)
 199         {
 200                 va_start(args, fmt);
 201                 if (!stderr_quiet)
 202                 {
 203                         vfprintf(stderr, fmt, args);
 204                         fprintf(stderr, "\n");
 205                 }
 206                 vsyslog(priority, fmt, args);
 207                 va_end(args);
 208         }
 209 }
 210
 211 /**
 212  * openac main program
 213  */
 214 int main(int argc, char **argv)
 215 {
 216         char *keyfile = NULL;
 217         char *certfile = NULL;
 218         char *usercertfile = NULL;
 219         char *outfile = NULL;
 220         char buf[BUF_LEN];
 221
 222         chunk_t passphrase = { buf, 0 };
 223         chunk_t attr_cert = chunk_empty;
 224         x509ac_t *ac = NULL;
 225
 226         const time_t default_validity = 24*3600;        /* 24 hours */
 227         time_t validity = 0;
 228         int status = 1;
 229
 230         /* enable openac debugging hook */
 231         dbg = openac_dbg;
 232
 233         passphrase.ptr[0] = '\0';
 234         groups = linked_list_create();
 235
 236         openlog("openac", 0, LOG_AUTHPRIV);
 237
 238         /* handle arguments */
 239         for (;;)
 240         {
 241                 static const struct option long_opts[] = {
 242                         /* name, has_arg, flag, val */
 243                         { "help", no_argument, NULL, 'h' },
 244                         { "version", no_argument, NULL, 'v' },
 245                         { "optionsfrom", required_argument, NULL, '+' },
 246                         { "quiet", no_argument, NULL, 'q' },
 247                         { "cert", required_argument, NULL, 'c' },
 248                         { "key", required_argument, NULL, 'k' },
 249                         { "password", required_argument, NULL, 'p' },
 250                         { "usercert", required_argument, NULL, 'u' },
 251                         { "groups", required_argument, NULL, 'g' },
 252                         { "days", required_argument, NULL, 'D' },
 253                         { "hours", required_argument, NULL, 'H' },
 254                         { "startdate", required_argument, NULL, 'S' },
 255                         { "enddate", required_argument, NULL, 'E' },
 256                         { "out", required_argument, NULL, 'o' },
 257                         { "debug", required_argument, NULL, 'd' },
 258                         { 0,0,0,0 }
 259                 };
 260
 261                 int c = getopt_long(argc, argv, "hv+:qc:k:p;u:g:D:H:S:E:o:d:", long_opts, NULL);
 262
 263                 /* Note: "breaking" from case terminates loop */
 264                 switch (c)
 265                 {
 266                         case EOF:       /* end of flags */
 267                                 break;
 268
 269                         case 0: /* long option already handled */
 270                                 continue;
 271
 272                         case ':':       /* diagnostic already printed by getopt_long */
 273                         case '?':       /* diagnostic already printed by getopt_long */
 274                         case 'h':       /* --help */
 275                                 usage(NULL);
 276                                 status = 1;
 277                                 goto end;
 278
 279                         case 'v':       /* --version */
 280                                 printf("openac (strongSwan %s)\n", VERSION);
 281                                 status = 0;
 282                                 goto end;
 283
 284                         case '+':       /* --optionsfrom <filename> */
 285                                 {
 286                                         char path[BUF_LEN];
 287
 288                                         if (*optarg == '/')     /* absolute pathname */
 289                                         {
 290                                         strncpy(path, optarg, BUF_LEN);
 291                                         }
 292                                         else                    /* relative pathname */
 293                                         {
 294                                         snprintf(path, BUF_LEN, "%s/%s", OPENAC_PATH, optarg);
 295                                         }
 296                                         if (!optionsfrom(path, &argc, &argv, optind))
 297                                         {
 298                                                 status = 1;
 299                                                 goto end;
 300                                         }
 301                                 }
 302                                 continue;
 303
 304                         case 'q':       /* --quiet */
 305                                 stderr_quiet = TRUE;
 306                                 continue;
 307
 308                         case 'c':       /* --cert */
 309                                 certfile = optarg;
 310                                 continue;
 311
 312                         case 'k':       /* --key */
 313                                 keyfile = optarg;
 314                                 continue;
 315
 316                         case 'p':       /* --key */
 317                                 if (strlen(optarg) > BUF_LEN)
 318                                 {
 319                                         usage("passphrase too long");
 320                                         goto end;
 321                                 }
 322                                 strncpy(passphrase.ptr, optarg, BUF_LEN);
 323                                 passphrase.len = min(strlen(optarg), BUF_LEN);
 324                                 continue;
 325
 326                         case 'u':       /* --usercert */
 327                                 usercertfile = optarg;
 328                                 continue;
 329
 330                         case 'g':       /* --groups */
 331                                 ietfAttr_list_create_from_string(optarg, groups);
 332                                 continue;
 333
 334                         case 'D':       /* --days */
 335                                 if (optarg == NULL || !isdigit(optarg[0]))
 336                                 {
 337                                         usage("missing number of days");
 338                                         goto end;
 339                                 }
 340                                 else
 341                                 {
 342                                         char *endptr;
 343                                         long days = strtol(optarg, &endptr, 0);
 344
 345                                         if (*endptr != '\0' || endptr == optarg || days <= 0)
 346                                         {
 347                                                 usage("<days> must be a positive number");
 348                                                 goto end;
 349                                         }
 350                                         validity += 24*3600*days;
 351                                 }
 352                                 continue;
 353
 354                         case 'H':       /* --hours */
 355                                 if (optarg == NULL || !isdigit(optarg[0]))
 356                                 {
 357                                         usage("missing number of hours");
 358                                         goto end;
 359                                 }
 360                                 else
 361                                 {
 362                                         char *endptr;
 363                                         long hours = strtol(optarg, &endptr, 0);
 364
 365                                         if (*endptr != '\0' || endptr == optarg || hours <= 0)
 366                                         {
 367                                                 usage("<hours> must be a positive number");
 368                                                 goto end;
 369                                         }
 370                                         validity += 3600*hours;
 371                                 }
 372                                 continue;
 373
 374                         case 'S':       /* --startdate */
 375                                 if (optarg == NULL || strlen(optarg) != 15 || optarg[14] != 'Z')
 376                                 {
 377                                         usage("date format must be YYYYMMDDHHMMSSZ");
 378                                         goto end;
 379                                 }
 380                                 else
 381                                 {
 382                                         chunk_t date = { optarg, 15 };
 383
 384                                         notBefore = asn1totime(&date, ASN1_GENERALIZEDTIME);
 385                                 }
 386                                 continue;
 387
 388                         case 'E':       /* --enddate */
 389                                 if (optarg == NULL || strlen(optarg) != 15 || optarg[14] != 'Z')
 390                                 {
 391                                         usage("date format must be YYYYMMDDHHMMSSZ");
 392                                         goto end;
 393                                 }
 394                                 else
 395                                 {
 396                                         chunk_t date = { optarg, 15 };
 397                                         notAfter = asn1totime(&date, ASN1_GENERALIZEDTIME);
 398                                 }
 399                                 continue;
 400
 401                         case 'o':       /* --out */
 402                                 outfile = optarg;
 403                                 continue;
 404
 405                         case 'd':       /* --debug */
 406                                 debug_level = atoi(optarg);
 407                                 continue;
 408
 409                         default:
 410                                 usage("");
 411                                 status = 0;
 412                                 goto end;
 413                 }
 414                 break;
 415         }
 416
 417         if (optind != argc)
 418         {
 419                 usage("unexpected argument");
 420                 goto end;
 421         }
 422
 423         DBG1("starting openac (strongSwan Version %s)", VERSION);
 424
 425 #ifdef INTEGRITY_TEST
 426         DBG1("integrity test of libstrongswan code");
 427         if (fips_verify_hmac_signature(hmac_key, hmac_signature))
 428         {
 429                 DBG1("  integrity test passed");
 430         }
 431         else
 432         {
 433                 DBG1("  integrity test failed");
 434                 status = 3;
 435                 goto end;
 436         }
 437 #endif /* INTEGRITY_TEST */
 438
 439         /* load the signer's RSA private key */
 440         if (keyfile != NULL)
 441         {
 442                 signerkey = rsa_private_key_create_from_file(keyfile, &passphrase);
 443
 444                 if (signerkey == NULL)
 445                 {
 446                         goto end;
 447                 }
 448         }
 449
 450         /* load the signer's X.509 certificate */
 451         if (certfile != NULL)
 452         {
 453                 signercert = x509_create_from_file(certfile, "signer cert");
 454
 455                 if (signercert == NULL)
 456                 {
 457                         goto end;
 458                 }
 459         }
 460
 461         /* load the users's X.509 certificate */
 462         if (usercertfile != NULL)
 463         {
 464                 usercert = x509_create_from_file(usercertfile, "user cert");
 465
 466                 if (usercert == NULL)
 467                 {
 468                         goto end;
 469                 }
 470         }
 471
 472         /* compute validity interval */
 473         validity = (validity)? validity : default_validity;
 474         notBefore = (notBefore == UNDEFINED_TIME) ? time(NULL) : notBefore;
 475         notAfter =  (notAfter  == UNDEFINED_TIME) ? time(NULL) + validity : notAfter;
 476
 477         /* build and parse attribute certificate */
 478         if (usercert != NULL && signercert != NULL && signerkey != NULL)
 479         {
 480                 /* read the serial number and increment it by one */
 481                 serial = read_serial();
 482
 483                 attr_cert = build_attr_cert();
 484                 ac = x509ac_create_from_chunk(attr_cert);
 485
 486                 /* write the attribute certificate to file */
 487                 if (chunk_write(attr_cert, outfile, "attribute cert", 0022, TRUE))
 488                 {
 489                         write_serial(serial);
 490                         status = 0;
 491                 }
 492         }
 493
 494 end:
 495         /* delete all dynamically allocated objects */
 496         DESTROY_IF(signerkey);
 497         DESTROY_IF(signercert);
 498         DESTROY_IF(usercert);
 499         DESTROY_IF(ac);
 500         ietfAttr_list_destroy(groups);
 501         free(serial.ptr);
 502         closelog();
 503         dbg = dbg_default;
 504         exit(status);
 505 }