x509.c 24.2 KB
Newer Older
1 2 3
/*
 *  X.509 certificate and private key decoding
 *
4
 *  Copyright (C) 2006-2014, Brainspark B.V.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
 *
 *  This file is part of PolarSSL (http://www.polarssl.org)
 *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
 *
 *  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
/*
 *  The ITU-T X.509 standard defines a certificate format for PKI.
 *
 *  http://www.ietf.org/rfc/rfc3279.txt
 *  http://www.ietf.org/rfc/rfc3280.txt
 *
 *  ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-1v2.asc
 *
 *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
 *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
 */

37
#if !defined(POLARSSL_CONFIG_FILE)
38
#include "polarssl/config.h"
39 40 41
#else
#include POLARSSL_CONFIG_FILE
#endif
42 43 44 45 46 47 48 49 50 51

#if defined(POLARSSL_X509_USE_C)

#include "polarssl/x509.h"
#include "polarssl/asn1.h"
#include "polarssl/oid.h"
#if defined(POLARSSL_PEM_PARSE_C)
#include "polarssl/pem.h"
#endif

52 53
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
54
#else
55
#define polarssl_printf     printf
56 57 58 59 60 61
#define polarssl_malloc     malloc
#define polarssl_free       free
#endif

#include <string.h>
#include <stdlib.h>
62
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
63 64 65 66 67
#include <windows.h>
#else
#include <time.h>
#endif

68 69 70 71
#if defined(EFIX64) || defined(EFI32)
#include <stdio.h>
#endif

72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#if !defined(_WIN32)
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#endif
#endif

/*
 *  CertificateSerialNumber  ::=  INTEGER
 */
int x509_get_serial( unsigned char **p, const unsigned char *end,
                     x509_buf *serial )
{
    int ret;

    if( ( end - *p ) < 1 )
90
        return( POLARSSL_ERR_X509_INVALID_SERIAL +
91 92 93 94
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    if( **p != ( ASN1_CONTEXT_SPECIFIC | ASN1_PRIMITIVE | 2 ) &&
        **p !=   ASN1_INTEGER )
95
        return( POLARSSL_ERR_X509_INVALID_SERIAL +
96 97 98 99 100
                POLARSSL_ERR_ASN1_UNEXPECTED_TAG );

    serial->tag = *(*p)++;

    if( ( ret = asn1_get_len( p, end, &serial->len ) ) != 0 )
101
        return( POLARSSL_ERR_X509_INVALID_SERIAL + ret );
102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120

    serial->p = *p;
    *p += serial->len;

    return( 0 );
}

/* Get an algorithm identifier without parameters (eg for signatures)
 *
 *  AlgorithmIdentifier  ::=  SEQUENCE  {
 *       algorithm               OBJECT IDENTIFIER,
 *       parameters              ANY DEFINED BY algorithm OPTIONAL  }
 */
int x509_get_alg_null( unsigned char **p, const unsigned char *end,
                       x509_buf *alg )
{
    int ret;

    if( ( ret = asn1_get_alg_null( p, end, alg ) ) != 0 )
121
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );
122 123 124 125

    return( 0 );
}

126 127 128 129 130 131 132 133 134 135 136 137 138 139
/*
 * Parse an algorithm identifier with (optional) paramaters
 */
int x509_get_alg( unsigned char **p, const unsigned char *end,
                  x509_buf *alg, x509_buf *params )
{
    int ret;

    if( ( ret = asn1_get_alg( p, end, alg, params ) ) != 0 )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    return( 0 );
}

140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
/*
 * HashAlgorithm ::= AlgorithmIdentifier
 *
 * AlgorithmIdentifier  ::=  SEQUENCE  {
 *      algorithm               OBJECT IDENTIFIER,
 *      parameters              ANY DEFINED BY algorithm OPTIONAL  }
 *
 * For HashAlgorithm, parameters MUST be NULL or absent.
 */
static int x509_get_hash_alg( const x509_buf *alg, md_type_t *md_alg )
{
    int ret;
    unsigned char *p;
    const unsigned char *end;
    x509_buf md_oid;
    size_t len;

    /* Make sure we got a SEQUENCE and setup bounds */
    if( alg->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
        return( POLARSSL_ERR_X509_INVALID_ALG +
                POLARSSL_ERR_ASN1_UNEXPECTED_TAG );

    p = (unsigned char *) alg->p;
    end = p + alg->len;

    if( p >= end )
        return( POLARSSL_ERR_X509_INVALID_ALG +
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    /* Parse md_oid */
    md_oid.tag = *p;

    if( ( ret = asn1_get_tag( &p, end, &md_oid.len, ASN1_OID ) ) != 0 )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    md_oid.p = p;
    p += md_oid.len;

    /* Get md_alg from md_oid */
    if( ( ret = oid_get_md_alg( &md_oid, md_alg ) ) != 0 )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    /* Make sure params is absent of NULL */
    if( p == end )
        return( 0 );

    if( ( ret = asn1_get_tag( &p, end, &len, ASN1_NULL ) ) != 0 )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    if( p != end )
        return( POLARSSL_ERR_X509_INVALID_ALG +
                POLARSSL_ERR_ASN1_LENGTH_MISMATCH );

    return( 0 );
}

196 197 198 199 200 201 202 203 204
/*
 *    RSASSA-PSS-params  ::=  SEQUENCE  {
 *       hashAlgorithm     [0] HashAlgorithm DEFAULT sha1Identifier,
 *       maskGenAlgorithm  [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier,
 *       saltLength        [2] INTEGER DEFAULT 20,
 *       trailerField      [3] INTEGER DEFAULT 1  }
 *    -- Note that the tags in this Sequence are explicit.
 */
int x509_get_rsassa_pss_params( const x509_buf *params,
205 206
                                md_type_t *md_alg, md_type_t *mgf_md,
                                int *salt_len, int *trailer_field )
207 208 209 210 211
{
    int ret;
    unsigned char *p;
    const unsigned char *end;
    size_t len;
212
    x509_buf alg_id, alg_params;
213 214 215

    /* First set everything to defaults */
    *md_alg = POLARSSL_MD_SHA1;
216
    *mgf_md = POLARSSL_MD_SHA1;
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
    *salt_len = 20;
    *trailer_field = 1;

    /* Make sure params is a SEQUENCE and setup bounds */
    if( params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
        return( POLARSSL_ERR_X509_INVALID_ALG +
                POLARSSL_ERR_ASN1_UNEXPECTED_TAG );

    p = (unsigned char *) params->p;
    end = p + params->len;

    if( p == end )
        return( 0 );

    if( ( ret = asn1_get_tag( &p, end, &len,
                    ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) == 0 )
    {
234 235 236 237 238 239
        /* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */
        if( ( ret = x509_get_alg_null( &p, p + len, &alg_id ) ) != 0 )
            return( ret );

        if( ( ret = oid_get_md_alg( &alg_id, md_alg ) ) != 0 )
            return( POLARSSL_ERR_X509_INVALID_ALG + ret );
240 241 242 243 244 245 246
    }
    else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    if( ( ret = asn1_get_tag( &p, end, &len,
                    ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) ) == 0 )
    {
247 248 249 250 251 252 253 254 255 256 257 258
        /* MaskGenAlgorithm ::= AlgorithmIdentifier (params = HashAlgorithm) */
        if( ( ret = x509_get_alg( &p, p + len, &alg_id, &alg_params ) ) != 0 )
            return( ret );

        /* Only MFG1 is recognised for now */
        if( ! OID_CMP( OID_MGF1, &alg_id ) )
            return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE +
                    POLARSSL_ERR_OID_NOT_FOUND );

        /* Parse HashAlgorithm */
        if( ( ret = x509_get_hash_alg( &alg_params, mgf_md ) ) != 0 )
            return( ret );
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
    }
    else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    if( p == end )
        return( 0 );

    if( ( ret = asn1_get_tag( &p, end, &len,
                    ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 2 ) ) == 0 )
    {
        /* salt_len */
        if( ( ret = asn1_get_int( &p, p + len, salt_len ) ) != 0 )
            return( POLARSSL_ERR_X509_INVALID_ALG + ret );
    }
    else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    if( p == end )
        return( 0 );

    if( ( ret = asn1_get_tag( &p, end, &len,
                    ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 3 ) ) == 0 )
    {
        /* trailer_field */
        if( ( ret = asn1_get_int( &p, p + len, trailer_field ) ) != 0 )
            return( POLARSSL_ERR_X509_INVALID_ALG + ret );
    }
    else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
        return( POLARSSL_ERR_X509_INVALID_ALG + ret );

    if( p != end )
        return( POLARSSL_ERR_X509_INVALID_ALG +
                POLARSSL_ERR_ASN1_LENGTH_MISMATCH );

    return( 0 );
}

296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
/*
 *  AttributeTypeAndValue ::= SEQUENCE {
 *    type     AttributeType,
 *    value    AttributeValue }
 *
 *  AttributeType ::= OBJECT IDENTIFIER
 *
 *  AttributeValue ::= ANY DEFINED BY AttributeType
 */
static int x509_get_attr_type_value( unsigned char **p,
                                     const unsigned char *end,
                                     x509_name *cur )
{
    int ret;
    size_t len;
    x509_buf *oid;
    x509_buf *val;

    if( ( ret = asn1_get_tag( p, end, &len,
            ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
316
        return( POLARSSL_ERR_X509_INVALID_NAME + ret );
317 318

    if( ( end - *p ) < 1 )
319
        return( POLARSSL_ERR_X509_INVALID_NAME +
320 321 322 323 324 325
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    oid = &cur->oid;
    oid->tag = **p;

    if( ( ret = asn1_get_tag( p, end, &oid->len, ASN1_OID ) ) != 0 )
326
        return( POLARSSL_ERR_X509_INVALID_NAME + ret );
327 328 329 330 331

    oid->p = *p;
    *p += oid->len;

    if( ( end - *p ) < 1 )
332
        return( POLARSSL_ERR_X509_INVALID_NAME +
333 334 335 336 337
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    if( **p != ASN1_BMP_STRING && **p != ASN1_UTF8_STRING      &&
        **p != ASN1_T61_STRING && **p != ASN1_PRINTABLE_STRING &&
        **p != ASN1_IA5_STRING && **p != ASN1_UNIVERSAL_STRING )
338
        return( POLARSSL_ERR_X509_INVALID_NAME +
339 340 341 342 343 344
                POLARSSL_ERR_ASN1_UNEXPECTED_TAG );

    val = &cur->val;
    val->tag = *(*p)++;

    if( ( ret = asn1_get_len( p, end, &val->len ) ) != 0 )
345
        return( POLARSSL_ERR_X509_INVALID_NAME + ret );
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376

    val->p = *p;
    *p += val->len;

    cur->next = NULL;

    return( 0 );
}

/*
 *  RelativeDistinguishedName ::=
 *    SET OF AttributeTypeAndValue
 *
 *  AttributeTypeAndValue ::= SEQUENCE {
 *    type     AttributeType,
 *    value    AttributeValue }
 *
 *  AttributeType ::= OBJECT IDENTIFIER
 *
 *  AttributeValue ::= ANY DEFINED BY AttributeType
 */
int x509_get_name( unsigned char **p, const unsigned char *end,
                   x509_name *cur )
{
    int ret;
    size_t len;
    const unsigned char *end2;
    x509_name *use;

    if( ( ret = asn1_get_tag( p, end, &len,
            ASN1_CONSTRUCTED | ASN1_SET ) ) != 0 )
377
        return( POLARSSL_ERR_X509_INVALID_NAME + ret );
378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433

    end2 = end;
    end  = *p + len;
    use = cur;

    do
    {
        if( ( ret = x509_get_attr_type_value( p, end, use ) ) != 0 )
            return( ret );

        if( *p != end )
        {
            use->next = (x509_name *) polarssl_malloc(
                    sizeof( x509_name ) );

            if( use->next == NULL )
                return( POLARSSL_ERR_X509_MALLOC_FAILED );

            memset( use->next, 0, sizeof( x509_name ) );

            use = use->next;
        }
    }
    while( *p != end );

    /*
     * recurse until end of SEQUENCE is reached
     */
    if( *p == end2 )
        return( 0 );

    cur->next = (x509_name *) polarssl_malloc(
         sizeof( x509_name ) );

    if( cur->next == NULL )
        return( POLARSSL_ERR_X509_MALLOC_FAILED );

    memset( cur->next, 0, sizeof( x509_name ) );

    return( x509_get_name( p, end2, cur->next ) );
}

/*
 *  Time ::= CHOICE {
 *       utcTime        UTCTime,
 *       generalTime    GeneralizedTime }
 */
int x509_get_time( unsigned char **p, const unsigned char *end,
                   x509_time *time )
{
    int ret;
    size_t len;
    char date[64];
    unsigned char tag;

    if( ( end - *p ) < 1 )
434
        return( POLARSSL_ERR_X509_INVALID_DATE +
435 436 437 438 439 440 441 442
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    tag = **p;

    if ( tag == ASN1_UTC_TIME )
    {
        (*p)++;
        ret = asn1_get_len( p, end, &len );
443

444
        if( ret != 0 )
445
            return( POLARSSL_ERR_X509_INVALID_DATE + ret );
446 447 448 449 450

        memset( date,  0, sizeof( date ) );
        memcpy( date, *p, ( len < sizeof( date ) - 1 ) ?
                len : sizeof( date ) - 1 );

451
        if( sscanf( date, "%2d%2d%2d%2d%2d%2dZ",
452 453
                    &time->year, &time->mon, &time->day,
                    &time->hour, &time->min, &time->sec ) < 5 )
454
            return( POLARSSL_ERR_X509_INVALID_DATE );
455 456 457 458 459 460 461 462 463 464 465 466

        time->year +=  100 * ( time->year < 50 );
        time->year += 1900;

        *p += len;

        return( 0 );
    }
    else if ( tag == ASN1_GENERALIZED_TIME )
    {
        (*p)++;
        ret = asn1_get_len( p, end, &len );
467

468
        if( ret != 0 )
469
            return( POLARSSL_ERR_X509_INVALID_DATE + ret );
470 471 472 473 474

        memset( date,  0, sizeof( date ) );
        memcpy( date, *p, ( len < sizeof( date ) - 1 ) ?
                len : sizeof( date ) - 1 );

475
        if( sscanf( date, "%4d%2d%2d%2d%2d%2dZ",
476 477
                    &time->year, &time->mon, &time->day,
                    &time->hour, &time->min, &time->sec ) < 5 )
478
            return( POLARSSL_ERR_X509_INVALID_DATE );
479 480 481 482 483 484

        *p += len;

        return( 0 );
    }
    else
485 486
        return( POLARSSL_ERR_X509_INVALID_DATE +
                POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
487 488 489 490 491 492 493 494
}

int x509_get_sig( unsigned char **p, const unsigned char *end, x509_buf *sig )
{
    int ret;
    size_t len;

    if( ( end - *p ) < 1 )
495
        return( POLARSSL_ERR_X509_INVALID_SIGNATURE +
496 497 498 499 500
                POLARSSL_ERR_ASN1_OUT_OF_DATA );

    sig->tag = **p;

    if( ( ret = asn1_get_bitstring_null( p, end, &len ) ) != 0 )
501
        return( POLARSSL_ERR_X509_INVALID_SIGNATURE + ret );
502 503 504 505 506 507 508 509 510

    sig->len = len;
    sig->p = *p;

    *p += len;

    return( 0 );
}

511 512
int x509_get_sig_alg( const x509_buf *sig_oid, md_type_t *md_alg,
                      pk_type_t *pk_alg )
513
{
514
    int ret = oid_get_sig_alg( sig_oid, md_alg, pk_alg );
515

516
    if( ret != 0 )
517
        return( POLARSSL_ERR_X509_UNKNOWN_SIG_ALG + ret );
518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553

    return( 0 );
}

/*
 * X.509 Extensions (No parsing of extensions, pointer should
 * be either manually updated or extensions should be parsed!
 */
int x509_get_ext( unsigned char **p, const unsigned char *end,
                  x509_buf *ext, int tag )
{
    int ret;
    size_t len;

    if( *p == end )
        return( 0 );

    ext->tag = **p;

    if( ( ret = asn1_get_tag( p, end, &ext->len,
            ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | tag ) ) != 0 )
        return( ret );

    ext->p = *p;
    end = *p + ext->len;

    /*
     * Extensions  ::=  SEQUENCE SIZE (1..MAX) OF Extension
     *
     * Extension  ::=  SEQUENCE  {
     *      extnID      OBJECT IDENTIFIER,
     *      critical    BOOLEAN DEFAULT FALSE,
     *      extnValue   OCTET STRING  }
     */
    if( ( ret = asn1_get_tag( p, end, &len,
            ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
554
        return( POLARSSL_ERR_X509_INVALID_EXTENSIONS + ret );
555 556

    if( end != *p + len )
557
        return( POLARSSL_ERR_X509_INVALID_EXTENSIONS +
558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
                POLARSSL_ERR_ASN1_LENGTH_MISMATCH );

    return( 0 );
}

#if defined(POLARSSL_FS_IO)
/*
 * Load all data from a file into a given buffer.
 */
int x509_load_file( const char *path, unsigned char **buf, size_t *n )
{
    FILE *f;
    long size;

    if( ( f = fopen( path, "rb" ) ) == NULL )
        return( POLARSSL_ERR_X509_FILE_IO_ERROR );

    fseek( f, 0, SEEK_END );
    if( ( size = ftell( f ) ) == -1 )
    {
        fclose( f );
        return( POLARSSL_ERR_X509_FILE_IO_ERROR );
    }
    fseek( f, 0, SEEK_SET );

    *n = (size_t) size;

    if( *n + 1 == 0 ||
        ( *buf = (unsigned char *) polarssl_malloc( *n + 1 ) ) == NULL )
    {
        fclose( f );
        return( POLARSSL_ERR_X509_MALLOC_FAILED );
    }

    if( fread( *buf, 1, *n, f ) != *n )
    {
        fclose( f );
        polarssl_free( *buf );
        return( POLARSSL_ERR_X509_FILE_IO_ERROR );
    }

    fclose( f );

    (*buf)[*n] = '\0';

    return( 0 );
}
#endif /* POLARSSL_FS_IO */

607 608
#if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \
    !defined(EFI32)
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640
#include <stdarg.h>

#if !defined vsnprintf
#define vsnprintf _vsnprintf
#endif // vsnprintf

/*
 * Windows _snprintf and _vsnprintf are not compatible to linux versions.
 * Result value is not size of buffer needed, but -1 if no fit is possible.
 *
 * This fuction tries to 'fix' this by at least suggesting enlarging the
 * size by 20.
 */
static int compat_snprintf(char *str, size_t size, const char *format, ...)
{
    va_list ap;
    int res = -1;

    va_start( ap, format );

    res = vsnprintf( str, size, format, ap );

    va_end( ap );

    // No quick fix possible
    if ( res < 0 )
        return( (int) size + 20 );

    return res;
}

#define snprintf compat_snprintf
641
#endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662

#define POLARSSL_ERR_DEBUG_BUF_TOO_SMALL    -2

#define SAFE_SNPRINTF()                         \
{                                               \
    if( ret == -1 )                             \
        return( -1 );                           \
                                                \
    if ( (unsigned int) ret > n ) {             \
        p[n - 1] = '\0';                        \
        return POLARSSL_ERR_DEBUG_BUF_TOO_SMALL;\
    }                                           \
                                                \
    n -= (unsigned int) ret;                    \
    p += (unsigned int) ret;                    \
}

/*
 * Store the name in printable form into buf; no more
 * than size characters will be written
 */
663
int x509_dn_gets( char *buf, size_t size, const x509_name *dn )
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
{
    int ret;
    size_t i, n;
    unsigned char c;
    const x509_name *name;
    const char *short_name = NULL;
    char s[128], *p;

    memset( s, 0, sizeof( s ) );

    name = dn;
    p = buf;
    n = size;

    while( name != NULL )
    {
        if( !name->oid.p )
        {
            name = name->next;
            continue;
        }

        if( name != dn )
        {
            ret = snprintf( p, n, ", " );
            SAFE_SNPRINTF();
        }

        ret = oid_get_attr_short_name( &name->oid, &short_name );

        if( ret == 0 )
            ret = snprintf( p, n, "%s=", short_name );
        else
            ret = snprintf( p, n, "\?\?=" );
        SAFE_SNPRINTF();

        for( i = 0; i < name->val.len; i++ )
        {
            if( i >= sizeof( s ) - 1 )
                break;

            c = name->val.p[i];
            if( c < 32 || c == 127 || ( c > 128 && c < 160 ) )
                 s[i] = '?';
            else s[i] = c;
        }
        s[i] = '\0';
        ret = snprintf( p, n, "%s", s );
        SAFE_SNPRINTF();
        name = name->next;
    }

    return( (int) ( size - n ) );
}

/*
 * Store the serial in printable form into buf; no more
 * than size characters will be written
 */
723
int x509_serial_gets( char *buf, size_t size, const x509_buf *serial )
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798
{
    int ret;
    size_t i, n, nr;
    char *p;

    p = buf;
    n = size;

    nr = ( serial->len <= 32 )
        ? serial->len  : 28;

    for( i = 0; i < nr; i++ )
    {
        if( i == 0 && nr > 1 && serial->p[i] == 0x0 )
            continue;

        ret = snprintf( p, n, "%02X%s",
                serial->p[i], ( i < nr - 1 ) ? ":" : "" );
        SAFE_SNPRINTF();
    }

    if( nr != serial->len )
    {
        ret = snprintf( p, n, "...." );
        SAFE_SNPRINTF();
    }

    return( (int) ( size - n ) );
}

/*
 * Helper for writing "RSA key size", "EC key size", etc
 */
int x509_key_size_helper( char *buf, size_t size, const char *name )
{
    char *p = buf;
    size_t n = size;
    int ret;

    if( strlen( name ) + sizeof( " key size" ) > size )
        return POLARSSL_ERR_DEBUG_BUF_TOO_SMALL;

    ret = snprintf( p, n, "%s key size", name );
    SAFE_SNPRINTF();

    return( 0 );
}

/*
 * Return an informational string describing the given OID
 */
const char *x509_oid_get_description( x509_buf *oid )
{
    const char *desc = NULL;
    int ret;

    ret = oid_get_extended_key_usage( oid, &desc );

    if( ret != 0 )
        return( NULL );

    return( desc );
}

/* Return the x.y.z.... style numeric string for the given OID */
int x509_oid_get_numeric_string( char *buf, size_t size, x509_buf *oid )
{
    return oid_get_numeric_string( buf, size, oid );
}

/*
 * Return 0 if the x509_time is still valid, or 1 otherwise.
 */
#if defined(POLARSSL_HAVE_TIME)

799 800
static void x509_get_current_time( x509_time *now )
{
801
#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
802 803
    SYSTEMTIME st;

804
    GetSystemTime(&st);
805

806 807 808 809 810 811
    now->year = st.wYear;
    now->mon = st.wMonth;
    now->day = st.wDay;
    now->hour = st.wHour;
    now->min = st.wMinute;
    now->sec = st.wSecond;
812
#else
813
    struct tm lt;
814 815 816
    time_t tt;

    tt = time( NULL );
817
    gmtime_r( &tt, &lt );
818 819 820 821 822 823 824

    now->year = lt.tm_year + 1900;
    now->mon = lt.tm_mon + 1;
    now->day = lt.tm_mday;
    now->hour = lt.tm_hour;
    now->min = lt.tm_min;
    now->sec = lt.tm_sec;
825
#endif /* _WIN32 && !EFIX64 && !EFI32 */
826
}
827

828 829 830 831 832 833
/*
 * Return 0 if before <= after, 1 otherwise
 */
static int x509_check_time( const x509_time *before, const x509_time *after )
{
    if( before->year  > after->year )
834 835
        return( 1 );

836 837
    if( before->year == after->year &&
        before->mon   > after->mon )
838 839
        return( 1 );

840 841 842
    if( before->year == after->year &&
        before->mon  == after->mon  &&
        before->day   > after->day )
843 844
        return( 1 );

845 846 847 848
    if( before->year == after->year &&
        before->mon  == after->mon  &&
        before->day  == after->day  &&
        before->hour  > after->hour )
849 850
        return( 1 );

851 852 853 854 855
    if( before->year == after->year &&
        before->mon  == after->mon  &&
        before->day  == after->day  &&
        before->hour == after->hour &&
        before->min   > after->min  )
856 857
        return( 1 );

858 859 860 861 862 863
    if( before->year == after->year &&
        before->mon  == after->mon  &&
        before->day  == after->day  &&
        before->hour == after->hour &&
        before->min  == after->min  &&
        before->sec   > after->sec  )
864 865 866 867
        return( 1 );

    return( 0 );
}
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886

int x509_time_expired( const x509_time *to )
{
    x509_time now;

    x509_get_current_time( &now );

    return( x509_check_time( &now, to ) );
}

int x509_time_future( const x509_time *from )
{
    x509_time now;

    x509_get_current_time( &now );

    return( x509_check_time( from, &now ) );
}

887
#else  /* POLARSSL_HAVE_TIME */
888

889
int x509_time_expired( const x509_time *to )
890 891 892 893
{
    ((void) to);
    return( 0 );
}
894 895 896 897 898 899

int x509_time_future( const x509_time *from )
{
    ((void) from);
    return( 0 );
}
900 901
#endif /* POLARSSL_HAVE_TIME */

902 903 904 905 906 907 908 909 910 911
#if defined(POLARSSL_SELF_TEST)

#include "polarssl/x509_crt.h"
#include "polarssl/certs.h"

/*
 * Checkup routine
 */
int x509_self_test( int verbose )
{
912
#if defined(POLARSSL_CERTS_C) && defined(POLARSSL_SHA1_C)
913 914
    int ret;
    int flags;
915 916
    x509_crt cacert;
    x509_crt clicert;
917 918

    if( verbose != 0 )
919
        polarssl_printf( "  X.509 certificate load: " );
920

921
    x509_crt_init( &clicert );
922

923 924
    ret = x509_crt_parse( &clicert, (const unsigned char *) test_cli_crt,
                          strlen( test_cli_crt ) );
925 926 927
    if( ret != 0 )
    {
        if( verbose != 0 )
928
            polarssl_printf( "failed\n" );
929 930 931 932

        return( ret );
    }

933
    x509_crt_init( &cacert );
934

935 936
    ret = x509_crt_parse( &cacert, (const unsigned char *) test_ca_crt,
                          strlen( test_ca_crt ) );
937 938 939
    if( ret != 0 )
    {
        if( verbose != 0 )
940
            polarssl_printf( "failed\n" );
941 942 943 944 945

        return( ret );
    }

    if( verbose != 0 )
946
        polarssl_printf( "passed\n  X.509 signature verify: ");
947

948
    ret = x509_crt_verify( &clicert, &cacert, NULL, NULL, &flags, NULL, NULL );
949 950 951
    if( ret != 0 )
    {
        if( verbose != 0 )
952
            polarssl_printf( "failed\n" );
953

954
        polarssl_printf("ret = %d, &flags = %04x\n", ret, flags);
955 956 957 958 959

        return( ret );
    }

    if( verbose != 0 )
960
        polarssl_printf( "passed\n\n");
961 962 963 964 965 966 967 968

    x509_crt_free( &cacert  );
    x509_crt_free( &clicert );

    return( 0 );
#else
    ((void) verbose);
    return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
969
#endif /* POLARSSL_CERTS_C && POLARSSL_SHA1_C */
970 971
}

972
#endif /* POLARSSL_SELF_TEST */
973

974
#endif /* POLARSSL_X509_USE_C */