x509.c

00001 /*
00002  *  X.509 common functions for parsing and verification
00003  *
00004  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
00005  *  SPDX-License-Identifier: Apache-2.0
00006  *
00007  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00008  *  not use this file except in compliance with the License.
00009  *  You may obtain a copy of the License at
00010  *
00011  *  http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  *  Unless required by applicable law or agreed to in writing, software
00014  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00015  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  *  See the License for the specific language governing permissions and
00017  *  limitations under the License.
00018  *
00019  *  This file is part of mbed TLS (https://tls.mbed.org)
00020  */
00021 /*
00022  *  The ITU-T X.509 standard defines a certificate format for PKI.
00023  *
00024  *  http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
00025  *  http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
00026  *  http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
00027  *
00028  *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
00029  *  http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
00030  */
00031 
00032 #if !defined(MBEDTLS_CONFIG_FILE)
00033 #include "mbedtls/config.h"
00034 #else
00035 #include MBEDTLS_CONFIG_FILE
00036 #endif
00037 
00038 #if defined(MBEDTLS_X509_USE_C)
00039 
00040 #include "mbedtls/x509.h"
00041 #include "mbedtls/asn1.h"
00042 #include "mbedtls/oid.h"
00043 
00044 #include <stdio.h>
00045 #include <string.h>
00046 
00047 #if defined(MBEDTLS_PEM_PARSE_C)
00048 #include "mbedtls/pem.h"
00049 #endif
00050 
00051 #if defined(MBEDTLS_PLATFORM_C)
00052 #include "mbedtls/platform.h"
00053 #else
00054 #include <stdio.h>
00055 #include <stdlib.h>
00056 #define mbedtls_free      free
00057 #define mbedtls_calloc    calloc
00058 #define mbedtls_printf    printf
00059 #define mbedtls_snprintf  snprintf
00060 #endif
00061 
00062 
00063 #if defined(MBEDTLS_HAVE_TIME)
00064 #include "mbedtls/platform_time.h"
00065 #endif
00066 
00067 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
00068 #include <windows.h>
00069 #else
00070 #include <time.h>
00071 #endif
00072 
00073 #if defined(MBEDTLS_FS_IO)
00074 #include <stdio.h>
00075 #if !defined(_WIN32)
00076 #include <sys/types.h>
00077 #include <sys/stat.h>
00078 #include <dirent.h>
00079 #endif
00080 #endif
00081 
00082 #define CHECK(code) if( ( ret = code ) != 0 ){ return( ret ); }
00083 #define CHECK_RANGE(min, max, val) if( val < min || val > max ){ return( ret ); }
00084 
00085 /*
00086  *  CertificateSerialNumber  ::=  INTEGER
00087  */
00088 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
00089                      mbedtls_x509_buf *serial )
00090 {
00091     int ret;
00092 
00093     if( ( end - *p ) < 1 )
00094         return( MBEDTLS_ERR_X509_INVALID_SERIAL +
00095                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00096 
00097     if( **p != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_PRIMITIVE | 2 ) &&
00098         **p !=   MBEDTLS_ASN1_INTEGER )
00099         return( MBEDTLS_ERR_X509_INVALID_SERIAL +
00100                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00101 
00102     serial->tag = *(*p)++;
00103 
00104     if( ( ret = mbedtls_asn1_get_len( p, end, &serial->len ) ) != 0 )
00105         return( MBEDTLS_ERR_X509_INVALID_SERIAL + ret );
00106 
00107     serial->p = *p;
00108     *p += serial->len;
00109 
00110     return( 0 );
00111 }
00112 
00113 /* Get an algorithm identifier without parameters (eg for signatures)
00114  *
00115  *  AlgorithmIdentifier  ::=  SEQUENCE  {
00116  *       algorithm               OBJECT IDENTIFIER,
00117  *       parameters              ANY DEFINED BY algorithm OPTIONAL  }
00118  */
00119 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
00120                        mbedtls_x509_buf *alg )
00121 {
00122     int ret;
00123 
00124     if( ( ret = mbedtls_asn1_get_alg_null( p, end, alg ) ) != 0 )
00125         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00126 
00127     return( 0 );
00128 }
00129 
00130 /*
00131  * Parse an algorithm identifier with (optional) paramaters
00132  */
00133 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
00134                   mbedtls_x509_buf *alg, mbedtls_x509_buf *params )
00135 {
00136     int ret;
00137 
00138     if( ( ret = mbedtls_asn1_get_alg( p, end, alg, params ) ) != 0 )
00139         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00140 
00141     return( 0 );
00142 }
00143 
00144 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
00145 /*
00146  * HashAlgorithm ::= AlgorithmIdentifier
00147  *
00148  * AlgorithmIdentifier  ::=  SEQUENCE  {
00149  *      algorithm               OBJECT IDENTIFIER,
00150  *      parameters              ANY DEFINED BY algorithm OPTIONAL  }
00151  *
00152  * For HashAlgorithm, parameters MUST be NULL or absent.
00153  */
00154 static int x509_get_hash_alg( const mbedtls_x509_buf *alg, mbedtls_md_type_t *md_alg )
00155 {
00156     int ret;
00157     unsigned char *p;
00158     const unsigned char *end;
00159     mbedtls_x509_buf md_oid;
00160     size_t len;
00161 
00162     /* Make sure we got a SEQUENCE and setup bounds */
00163     if( alg->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
00164         return( MBEDTLS_ERR_X509_INVALID_ALG +
00165                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00166 
00167     p = (unsigned char *) alg->p;
00168     end = p + alg->len;
00169 
00170     if( p >= end )
00171         return( MBEDTLS_ERR_X509_INVALID_ALG +
00172                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00173 
00174     /* Parse md_oid */
00175     md_oid.tag = *p;
00176 
00177     if( ( ret = mbedtls_asn1_get_tag( &p, end, &md_oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
00178         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00179 
00180     md_oid.p = p;
00181     p += md_oid.len;
00182 
00183     /* Get md_alg from md_oid */
00184     if( ( ret = mbedtls_oid_get_md_alg( &md_oid, md_alg ) ) != 0 )
00185         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00186 
00187     /* Make sure params is absent of NULL */
00188     if( p == end )
00189         return( 0 );
00190 
00191     if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_NULL ) ) != 0 || len != 0 )
00192         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00193 
00194     if( p != end )
00195         return( MBEDTLS_ERR_X509_INVALID_ALG +
00196                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00197 
00198     return( 0 );
00199 }
00200 
00201 /*
00202  *    RSASSA-PSS-params  ::=  SEQUENCE  {
00203  *       hashAlgorithm     [0] HashAlgorithm DEFAULT sha1Identifier,
00204  *       maskGenAlgorithm  [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier,
00205  *       saltLength        [2] INTEGER DEFAULT 20,
00206  *       trailerField      [3] INTEGER DEFAULT 1  }
00207  *    -- Note that the tags in this Sequence are explicit.
00208  *
00209  * RFC 4055 (which defines use of RSASSA-PSS in PKIX) states that the value
00210  * of trailerField MUST be 1, and PKCS#1 v2.2 doesn't even define any other
00211  * option. Enfore this at parsing time.
00212  */
00213 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
00214                                 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
00215                                 int *salt_len )
00216 {
00217     int ret;
00218     unsigned char *p;
00219     const unsigned char *end, *end2;
00220     size_t len;
00221     mbedtls_x509_buf alg_id, alg_params;
00222 
00223     /* First set everything to defaults */
00224     *md_alg = MBEDTLS_MD_SHA1;
00225     *mgf_md = MBEDTLS_MD_SHA1;
00226     *salt_len = 20;
00227 
00228     /* Make sure params is a SEQUENCE and setup bounds */
00229     if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
00230         return( MBEDTLS_ERR_X509_INVALID_ALG +
00231                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00232 
00233     p = (unsigned char *) params->p;
00234     end = p + params->len;
00235 
00236     if( p == end )
00237         return( 0 );
00238 
00239     /*
00240      * HashAlgorithm
00241      */
00242     if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
00243                     MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
00244     {
00245         end2 = p + len;
00246 
00247         /* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */
00248         if( ( ret = mbedtls_x509_get_alg_null( &p, end2, &alg_id ) ) != 0 )
00249             return( ret );
00250 
00251         if( ( ret = mbedtls_oid_get_md_alg( &alg_id, md_alg ) ) != 0 )
00252             return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00253 
00254         if( p != end2 )
00255             return( MBEDTLS_ERR_X509_INVALID_ALG +
00256                     MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00257     }
00258     else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
00259         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00260 
00261     if( p == end )
00262         return( 0 );
00263 
00264     /*
00265      * MaskGenAlgorithm
00266      */
00267     if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
00268                     MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
00269     {
00270         end2 = p + len;
00271 
00272         /* MaskGenAlgorithm ::= AlgorithmIdentifier (params = HashAlgorithm) */
00273         if( ( ret = mbedtls_x509_get_alg( &p, end2, &alg_id, &alg_params ) ) != 0 )
00274             return( ret );
00275 
00276         /* Only MFG1 is recognised for now */
00277         if( MBEDTLS_OID_CMP( MBEDTLS_OID_MGF1, &alg_id ) != 0 )
00278             return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE +
00279                     MBEDTLS_ERR_OID_NOT_FOUND );
00280 
00281         /* Parse HashAlgorithm */
00282         if( ( ret = x509_get_hash_alg( &alg_params, mgf_md ) ) != 0 )
00283             return( ret );
00284 
00285         if( p != end2 )
00286             return( MBEDTLS_ERR_X509_INVALID_ALG +
00287                     MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00288     }
00289     else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
00290         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00291 
00292     if( p == end )
00293         return( 0 );
00294 
00295     /*
00296      * salt_len
00297      */
00298     if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
00299                     MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 2 ) ) == 0 )
00300     {
00301         end2 = p + len;
00302 
00303         if( ( ret = mbedtls_asn1_get_int( &p, end2, salt_len ) ) != 0 )
00304             return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00305 
00306         if( p != end2 )
00307             return( MBEDTLS_ERR_X509_INVALID_ALG +
00308                     MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00309     }
00310     else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
00311         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00312 
00313     if( p == end )
00314         return( 0 );
00315 
00316     /*
00317      * trailer_field (if present, must be 1)
00318      */
00319     if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
00320                     MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 3 ) ) == 0 )
00321     {
00322         int trailer_field;
00323 
00324         end2 = p + len;
00325 
00326         if( ( ret = mbedtls_asn1_get_int( &p, end2, &trailer_field ) ) != 0 )
00327             return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00328 
00329         if( p != end2 )
00330             return( MBEDTLS_ERR_X509_INVALID_ALG +
00331                     MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00332 
00333         if( trailer_field != 1 )
00334             return( MBEDTLS_ERR_X509_INVALID_ALG );
00335     }
00336     else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
00337         return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
00338 
00339     if( p != end )
00340         return( MBEDTLS_ERR_X509_INVALID_ALG +
00341                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00342 
00343     return( 0 );
00344 }
00345 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
00346 
00347 /*
00348  *  AttributeTypeAndValue ::= SEQUENCE {
00349  *    type     AttributeType,
00350  *    value    AttributeValue }
00351  *
00352  *  AttributeType ::= OBJECT IDENTIFIER
00353  *
00354  *  AttributeValue ::= ANY DEFINED BY AttributeType
00355  */
00356 static int x509_get_attr_type_value( unsigned char **p,
00357                                      const unsigned char *end,
00358                                      mbedtls_x509_name *cur )
00359 {
00360     int ret;
00361     size_t len;
00362     mbedtls_x509_buf *oid;
00363     mbedtls_x509_buf *val;
00364 
00365     if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
00366             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
00367         return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
00368 
00369     if( ( end - *p ) < 1 )
00370         return( MBEDTLS_ERR_X509_INVALID_NAME +
00371                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00372 
00373     oid = &cur->oid;
00374     oid->tag = **p;
00375 
00376     if( ( ret = mbedtls_asn1_get_tag( p, end, &oid->len, MBEDTLS_ASN1_OID ) ) != 0 )
00377         return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
00378 
00379     oid->p = *p;
00380     *p += oid->len;
00381 
00382     if( ( end - *p ) < 1 )
00383         return( MBEDTLS_ERR_X509_INVALID_NAME +
00384                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00385 
00386     if( **p != MBEDTLS_ASN1_BMP_STRING && **p != MBEDTLS_ASN1_UTF8_STRING      &&
00387         **p != MBEDTLS_ASN1_T61_STRING && **p != MBEDTLS_ASN1_PRINTABLE_STRING &&
00388         **p != MBEDTLS_ASN1_IA5_STRING && **p != MBEDTLS_ASN1_UNIVERSAL_STRING &&
00389         **p != MBEDTLS_ASN1_BIT_STRING )
00390         return( MBEDTLS_ERR_X509_INVALID_NAME +
00391                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00392 
00393     val = &cur->val;
00394     val->tag = *(*p)++;
00395 
00396     if( ( ret = mbedtls_asn1_get_len( p, end, &val->len ) ) != 0 )
00397         return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
00398 
00399     val->p = *p;
00400     *p += val->len;
00401 
00402     cur->next = NULL;
00403 
00404     return( 0 );
00405 }
00406 
00407 /*
00408  *  Name ::= CHOICE { -- only one possibility for now --
00409  *       rdnSequence  RDNSequence }
00410  *
00411  *  RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
00412  *
00413  *  RelativeDistinguishedName ::=
00414  *    SET OF AttributeTypeAndValue
00415  *
00416  *  AttributeTypeAndValue ::= SEQUENCE {
00417  *    type     AttributeType,
00418  *    value    AttributeValue }
00419  *
00420  *  AttributeType ::= OBJECT IDENTIFIER
00421  *
00422  *  AttributeValue ::= ANY DEFINED BY AttributeType
00423  *
00424  * The data structure is optimized for the common case where each RDN has only
00425  * one element, which is represented as a list of AttributeTypeAndValue.
00426  * For the general case we still use a flat list, but we mark elements of the
00427  * same set so that they are "merged" together in the functions that consume
00428  * this list, eg mbedtls_x509_dn_gets().
00429  */
00430 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
00431                    mbedtls_x509_name *cur )
00432 {
00433     int ret;
00434     size_t set_len;
00435     const unsigned char *end_set;
00436 
00437     /* don't use recursion, we'd risk stack overflow if not optimized */
00438     while( 1 )
00439     {
00440         /*
00441          * parse SET
00442          */
00443         if( ( ret = mbedtls_asn1_get_tag( p, end, &set_len,
00444                 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET ) ) != 0 )
00445             return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
00446 
00447         end_set  = *p + set_len;
00448 
00449         while( 1 )
00450         {
00451             if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
00452                 return( ret );
00453 
00454             if( *p == end_set )
00455                 break;
00456 
00457             /* Mark this item as being no the only one in a set */
00458             cur->next_merged = 1;
00459 
00460             cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
00461 
00462             if( cur->next == NULL )
00463                 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
00464 
00465             cur = cur->next;
00466         }
00467 
00468         /*
00469          * continue until end of SEQUENCE is reached
00470          */
00471         if( *p == end )
00472             return( 0 );
00473 
00474         cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
00475 
00476         if( cur->next == NULL )
00477             return( MBEDTLS_ERR_X509_ALLOC_FAILED );
00478 
00479         cur = cur->next;
00480     }
00481 }
00482 
00483 static int x509_parse_int(unsigned char **p, unsigned n, int *res){
00484     *res = 0;
00485     for( ; n > 0; --n ){
00486         if( ( **p < '0') || ( **p > '9' ) ) return MBEDTLS_ERR_X509_INVALID_DATE;
00487         *res *= 10;
00488         *res += (*(*p)++ - '0');
00489     }
00490     return 0;
00491 }
00492 
00493 static int x509_date_is_valid(const mbedtls_x509_time *time)
00494 {
00495     int ret = MBEDTLS_ERR_X509_INVALID_DATE;
00496 
00497     CHECK_RANGE( 0, 9999, time->year );
00498     CHECK_RANGE( 0, 23,   time->hour );
00499     CHECK_RANGE( 0, 59,   time->min  );
00500     CHECK_RANGE( 0, 59,   time->sec  );
00501 
00502     switch( time->mon )
00503     {
00504         case 1: case 3: case 5: case 7: case 8: case 10: case 12:
00505             CHECK_RANGE( 1, 31, time->day );
00506             break;
00507         case 4: case 6: case 9: case 11:
00508             CHECK_RANGE( 1, 30, time->day );
00509             break;
00510         case 2:
00511             CHECK_RANGE( 1, 28 + (time->year % 4 == 0), time->day );
00512             break;
00513         default:
00514             return( ret );
00515     }
00516 
00517     return( 0 );
00518 }
00519 
00520 /*
00521  *  Time ::= CHOICE {
00522  *       utcTime        UTCTime,
00523  *       generalTime    GeneralizedTime }
00524  */
00525 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
00526                    mbedtls_x509_time *time )
00527 {
00528     int ret;
00529     size_t len;
00530     unsigned char tag;
00531 
00532     if( ( end - *p ) < 1 )
00533         return( MBEDTLS_ERR_X509_INVALID_DATE +
00534                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00535 
00536     tag = **p;
00537 
00538     if( tag == MBEDTLS_ASN1_UTC_TIME )
00539     {
00540         (*p)++;
00541         ret = mbedtls_asn1_get_len( p, end, &len );
00542 
00543         if( ret != 0 )
00544             return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
00545 
00546         CHECK( x509_parse_int( p, 2, &time->year ) );
00547         CHECK( x509_parse_int( p, 2, &time->mon ) );
00548         CHECK( x509_parse_int( p, 2, &time->day ) );
00549         CHECK( x509_parse_int( p, 2, &time->hour ) );
00550         CHECK( x509_parse_int( p, 2, &time->min ) );
00551         if( len > 10 )
00552             CHECK( x509_parse_int( p, 2, &time->sec ) );
00553         if( len > 12 && *(*p)++ != 'Z' )
00554             return( MBEDTLS_ERR_X509_INVALID_DATE );
00555 
00556         time->year +=  100 * ( time->year < 50 );
00557         time->year += 1900;
00558 
00559         CHECK( x509_date_is_valid( time ) );
00560 
00561         return( 0 );
00562     }
00563     else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME )
00564     {
00565         (*p)++;
00566         ret = mbedtls_asn1_get_len( p, end, &len );
00567 
00568         if( ret != 0 )
00569             return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
00570 
00571         CHECK( x509_parse_int( p, 4, &time->year ) );
00572         CHECK( x509_parse_int( p, 2, &time->mon ) );
00573         CHECK( x509_parse_int( p, 2, &time->day ) );
00574         CHECK( x509_parse_int( p, 2, &time->hour ) );
00575         CHECK( x509_parse_int( p, 2, &time->min ) );
00576         if( len > 12 )
00577             CHECK( x509_parse_int( p, 2, &time->sec ) );
00578         if( len > 14 && *(*p)++ != 'Z' )
00579             return( MBEDTLS_ERR_X509_INVALID_DATE );
00580 
00581         CHECK( x509_date_is_valid( time ) );
00582 
00583         return( 0 );
00584     }
00585     else
00586         return( MBEDTLS_ERR_X509_INVALID_DATE +
00587                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00588 }
00589 
00590 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig )
00591 {
00592     int ret;
00593     size_t len;
00594     int tag_type;
00595 
00596     if( ( end - *p ) < 1 )
00597         return( MBEDTLS_ERR_X509_INVALID_SIGNATURE +
00598                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00599 
00600     tag_type = **p;
00601 
00602     if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
00603         return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret );
00604 
00605     sig->tag = tag_type;
00606     sig->len = len;
00607     sig->p = *p;
00608 
00609     *p += len;
00610 
00611     return( 0 );
00612 }
00613 
00614 /*
00615  * Get signature algorithm from alg OID and optional parameters
00616  */
00617 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
00618                       mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
00619                       void **sig_opts )
00620 {
00621     int ret;
00622 
00623     if( *sig_opts != NULL )
00624         return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
00625 
00626     if( ( ret = mbedtls_oid_get_sig_alg( sig_oid, md_alg, pk_alg ) ) != 0 )
00627         return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + ret );
00628 
00629 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
00630     if( *pk_alg == MBEDTLS_PK_RSASSA_PSS )
00631     {
00632         mbedtls_pk_rsassa_pss_options *pss_opts;
00633 
00634         pss_opts = mbedtls_calloc( 1, sizeof( mbedtls_pk_rsassa_pss_options ) );
00635         if( pss_opts == NULL )
00636             return( MBEDTLS_ERR_X509_ALLOC_FAILED );
00637 
00638         ret = mbedtls_x509_get_rsassa_pss_params( sig_params,
00639                                           md_alg,
00640                                           &pss_opts->mgf1_hash_id,
00641                                           &pss_opts->expected_salt_len );
00642         if( ret != 0 )
00643         {
00644             mbedtls_free( pss_opts );
00645             return( ret );
00646         }
00647 
00648         *sig_opts = (void *) pss_opts;
00649     }
00650     else
00651 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
00652     {
00653         /* Make sure parameters are absent or NULL */
00654         if( ( sig_params->tag != MBEDTLS_ASN1_NULL && sig_params->tag != 0 ) ||
00655               sig_params->len != 0 )
00656         return( MBEDTLS_ERR_X509_INVALID_ALG );
00657     }
00658 
00659     return( 0 );
00660 }
00661 
00662 /*
00663  * X.509 Extensions (No parsing of extensions, pointer should
00664  * be either manually updated or extensions should be parsed!
00665  */
00666 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
00667                   mbedtls_x509_buf *ext, int tag )
00668 {
00669     int ret;
00670     size_t len;
00671 
00672     if( *p == end )
00673         return( 0 );
00674 
00675     ext->tag = **p;
00676 
00677     if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
00678             MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ) ) != 0 )
00679         return( ret );
00680 
00681     ext->p = *p;
00682     end = *p + ext->len;
00683 
00684     /*
00685      * Extensions  ::=  SEQUENCE SIZE (1..MAX) OF Extension
00686      *
00687      * Extension  ::=  SEQUENCE  {
00688      *      extnID      OBJECT IDENTIFIER,
00689      *      critical    BOOLEAN DEFAULT FALSE,
00690      *      extnValue   OCTET STRING  }
00691      */
00692     if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
00693             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
00694         return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
00695 
00696     if( end != *p + len )
00697         return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
00698                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00699 
00700     return( 0 );
00701 }
00702 
00703 /*
00704  * Store the name in printable form into buf; no more
00705  * than size characters will be written
00706  */
00707 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn )
00708 {
00709     int ret;
00710     size_t i, n;
00711     unsigned char c, merge = 0;
00712     const mbedtls_x509_name *name;
00713     const char *short_name = NULL;
00714     char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
00715 
00716     memset( s, 0, sizeof( s ) );
00717 
00718     name = dn;
00719     p = buf;
00720     n = size;
00721 
00722     while( name != NULL )
00723     {
00724         if( !name->oid.p )
00725         {
00726             name = name->next;
00727             continue;
00728         }
00729 
00730         if( name != dn )
00731         {
00732             ret = mbedtls_snprintf( p, n, merge ? " + " : ", " );
00733             MBEDTLS_X509_SAFE_SNPRINTF;
00734         }
00735 
00736         ret = mbedtls_oid_get_attr_short_name( &name->oid, &short_name );
00737 
00738         if( ret == 0 )
00739             ret = mbedtls_snprintf( p, n, "%s=", short_name );
00740         else
00741             ret = mbedtls_snprintf( p, n, "\?\?=" );
00742         MBEDTLS_X509_SAFE_SNPRINTF;
00743 
00744         for( i = 0; i < name->val.len; i++ )
00745         {
00746             if( i >= sizeof( s ) - 1 )
00747                 break;
00748 
00749             c = name->val.p[i];
00750             if( c < 32 || c == 127 || ( c > 128 && c < 160 ) )
00751                  s[i] = '?';
00752             else s[i] = c;
00753         }
00754         s[i] = '\0';
00755         ret = mbedtls_snprintf( p, n, "%s", s );
00756         MBEDTLS_X509_SAFE_SNPRINTF;
00757 
00758         merge = name->next_merged;
00759         name = name->next;
00760     }
00761 
00762     return( (int) ( size - n ) );
00763 }
00764 
00765 /*
00766  * Store the serial in printable form into buf; no more
00767  * than size characters will be written
00768  */
00769 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial )
00770 {
00771     int ret;
00772     size_t i, n, nr;
00773     char *p;
00774 
00775     p = buf;
00776     n = size;
00777 
00778     nr = ( serial->len <= 32 )
00779         ? serial->len  : 28;
00780 
00781     for( i = 0; i < nr; i++ )
00782     {
00783         if( i == 0 && nr > 1 && serial->p[i] == 0x0 )
00784             continue;
00785 
00786         ret = mbedtls_snprintf( p, n, "%02X%s",
00787                 serial->p[i], ( i < nr - 1 ) ? ":" : "" );
00788         MBEDTLS_X509_SAFE_SNPRINTF;
00789     }
00790 
00791     if( nr != serial->len )
00792     {
00793         ret = mbedtls_snprintf( p, n, "...." );
00794         MBEDTLS_X509_SAFE_SNPRINTF;
00795     }
00796 
00797     return( (int) ( size - n ) );
00798 }
00799 
00800 /*
00801  * Helper for writing signature algorithms
00802  */
00803 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
00804                        mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
00805                        const void *sig_opts )
00806 {
00807     int ret;
00808     char *p = buf;
00809     size_t n = size;
00810     const char *desc = NULL;
00811 
00812     ret = mbedtls_oid_get_sig_alg_desc( sig_oid, &desc );
00813     if( ret != 0 )
00814         ret = mbedtls_snprintf( p, n, "???"  );
00815     else
00816         ret = mbedtls_snprintf( p, n, "%s", desc );
00817     MBEDTLS_X509_SAFE_SNPRINTF;
00818 
00819 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
00820     if( pk_alg == MBEDTLS_PK_RSASSA_PSS )
00821     {
00822         const mbedtls_pk_rsassa_pss_options *pss_opts;
00823         const mbedtls_md_info_t *md_info, *mgf_md_info;
00824 
00825         pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
00826 
00827         md_info = mbedtls_md_info_from_type( md_alg );
00828         mgf_md_info = mbedtls_md_info_from_type( pss_opts->mgf1_hash_id );
00829 
00830         ret = mbedtls_snprintf( p, n, " (%s, MGF1-%s, 0x%02X)",
00831                               md_info ? mbedtls_md_get_name( md_info ) : "???",
00832                               mgf_md_info ? mbedtls_md_get_name( mgf_md_info ) : "???",
00833                               pss_opts->expected_salt_len );
00834         MBEDTLS_X509_SAFE_SNPRINTF;
00835     }
00836 #else
00837     ((void) pk_alg);
00838     ((void) md_alg);
00839     ((void) sig_opts);
00840 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
00841 
00842     return( (int)( size - n ) );
00843 }
00844 
00845 /*
00846  * Helper for writing "RSA key size", "EC key size", etc
00847  */
00848 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name )
00849 {
00850     char *p = buf;
00851     size_t n = buf_size;
00852     int ret;
00853 
00854     ret = mbedtls_snprintf( p, n, "%s key size", name );
00855     MBEDTLS_X509_SAFE_SNPRINTF;
00856 
00857     return( 0 );
00858 }
00859 
00860 #if defined(MBEDTLS_HAVE_TIME_DATE)
00861 /*
00862  * Set the time structure to the current time.
00863  * Return 0 on success, non-zero on failure.
00864  */
00865 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
00866 static int x509_get_current_time( mbedtls_x509_time *now )
00867 {
00868     SYSTEMTIME st;
00869 
00870     GetSystemTime( &st );
00871 
00872     now->year = st.wYear;
00873     now->mon  = st.wMonth;
00874     now->day  = st.wDay;
00875     now->hour = st.wHour;
00876     now->min  = st.wMinute;
00877     now->sec  = st.wSecond;
00878 
00879     return( 0 );
00880 }
00881 #else
00882 static int x509_get_current_time( mbedtls_x509_time *now )
00883 {
00884     struct tm *lt;
00885     mbedtls_time_t tt;
00886     int ret = 0;
00887 
00888 #if defined(MBEDTLS_THREADING_C)
00889     if( mbedtls_mutex_lock( &mbedtls_threading_gmtime_mutex ) != 0 )
00890         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00891 #endif
00892 
00893     tt = mbedtls_time( NULL );
00894     lt = gmtime( &tt );
00895 
00896     if( lt == NULL )
00897         ret = -1;
00898     else
00899     {
00900         now->year = lt->tm_year + 1900;
00901         now->mon  = lt->tm_mon  + 1;
00902         now->day  = lt->tm_mday;
00903         now->hour = lt->tm_hour;
00904         now->min  = lt->tm_min;
00905         now->sec  = lt->tm_sec;
00906     }
00907 
00908 #if defined(MBEDTLS_THREADING_C)
00909     if( mbedtls_mutex_unlock( &mbedtls_threading_gmtime_mutex ) != 0 )
00910         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00911 #endif
00912 
00913     return( ret );
00914 }
00915 #endif /* _WIN32 && !EFIX64 && !EFI32 */
00916 
00917 /*
00918  * Return 0 if before <= after, 1 otherwise
00919  */
00920 static int x509_check_time( const mbedtls_x509_time *before, const mbedtls_x509_time *after )
00921 {
00922     if( before->year  > after->year )
00923         return( 1 );
00924 
00925     if( before->year == after->year &&
00926         before->mon   > after->mon )
00927         return( 1 );
00928 
00929     if( before->year == after->year &&
00930         before->mon  == after->mon  &&
00931         before->day   > after->day )
00932         return( 1 );
00933 
00934     if( before->year == after->year &&
00935         before->mon  == after->mon  &&
00936         before->day  == after->day  &&
00937         before->hour  > after->hour )
00938         return( 1 );
00939 
00940     if( before->year == after->year &&
00941         before->mon  == after->mon  &&
00942         before->day  == after->day  &&
00943         before->hour == after->hour &&
00944         before->min   > after->min  )
00945         return( 1 );
00946 
00947     if( before->year == after->year &&
00948         before->mon  == after->mon  &&
00949         before->day  == after->day  &&
00950         before->hour == after->hour &&
00951         before->min  == after->min  &&
00952         before->sec   > after->sec  )
00953         return( 1 );
00954 
00955     return( 0 );
00956 }
00957 
00958 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
00959 {
00960     mbedtls_x509_time now;
00961 
00962     if( x509_get_current_time( &now ) != 0 )
00963         return( 1 );
00964 
00965     return( x509_check_time( &now, to ) );
00966 }
00967 
00968 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
00969 {
00970     mbedtls_x509_time now;
00971 
00972     if( x509_get_current_time( &now ) != 0 )
00973         return( 1 );
00974 
00975     return( x509_check_time( from, &now ) );
00976 }
00977 
00978 #else  /* MBEDTLS_HAVE_TIME_DATE */
00979 
00980 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
00981 {
00982     ((void) to);
00983     return( 0 );
00984 }
00985 
00986 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
00987 {
00988     ((void) from);
00989     return( 0 );
00990 }
00991 #endif /* MBEDTLS_HAVE_TIME_DATE */
00992 
00993 #if defined(MBEDTLS_SELF_TEST)
00994 
00995 #include "mbedtls/x509_crt.h"
00996 #include "mbedtls/certs.h"
00997 
00998 /*
00999  * Checkup routine
01000  */
01001 int mbedtls_x509_self_test( int verbose )
01002 {
01003 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA1_C)
01004     int ret;
01005     uint32_t flags;
01006     mbedtls_x509_crt cacert;
01007     mbedtls_x509_crt clicert;
01008 
01009     if( verbose != 0 )
01010         mbedtls_printf( "  X.509 certificate load: " );
01011 
01012     mbedtls_x509_crt_init( &clicert );
01013 
01014     ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
01015                            mbedtls_test_cli_crt_len );
01016     if( ret != 0 )
01017     {
01018         if( verbose != 0 )
01019             mbedtls_printf( "failed\n" );
01020 
01021         return( ret );
01022     }
01023 
01024     mbedtls_x509_crt_init( &cacert );
01025 
01026     ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_ca_crt,
01027                           mbedtls_test_ca_crt_len );
01028     if( ret != 0 )
01029     {
01030         if( verbose != 0 )
01031             mbedtls_printf( "failed\n" );
01032 
01033         return( ret );
01034     }
01035 
01036     if( verbose != 0 )
01037         mbedtls_printf( "passed\n  X.509 signature verify: ");
01038 
01039     ret = mbedtls_x509_crt_verify( &clicert, &cacert, NULL, NULL, &flags, NULL, NULL );
01040     if( ret != 0 )
01041     {
01042         if( verbose != 0 )
01043             mbedtls_printf( "failed\n" );
01044 
01045         return( ret );
01046     }
01047 
01048     if( verbose != 0 )
01049         mbedtls_printf( "passed\n\n");
01050 
01051     mbedtls_x509_crt_free( &cacert  );
01052     mbedtls_x509_crt_free( &clicert );
01053 
01054     return( 0 );
01055 #else
01056     ((void) verbose);
01057     return( 0 );
01058 #endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */
01059 }
01060 
01061 #endif /* MBEDTLS_SELF_TEST */
01062 
01063 #endif /* MBEDTLS_X509_USE_C */