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, size_t n, int *res )
00484 {
00485     *res = 0;
00486 
00487     for( ; n > 0; --n )
00488     {
00489         if( ( **p < '0') || ( **p > '9' ) )
00490             return ( MBEDTLS_ERR_X509_INVALID_DATE );
00491 
00492         *res *= 10;
00493         *res += ( *(*p)++ - '0' );
00494     }
00495 
00496     return( 0 );
00497 }
00498 
00499 static int x509_date_is_valid(const mbedtls_x509_time *t)
00500 {
00501     int ret = MBEDTLS_ERR_X509_INVALID_DATE;
00502 
00503     CHECK_RANGE( 0, 9999, t->year );
00504     CHECK_RANGE( 0, 23,   t->hour );
00505     CHECK_RANGE( 0, 59,   t->min  );
00506     CHECK_RANGE( 0, 59,   t->sec  );
00507 
00508     switch( t->mon )
00509     {
00510         case 1: case 3: case 5: case 7: case 8: case 10: case 12:
00511             CHECK_RANGE( 1, 31, t->day );
00512             break;
00513         case 4: case 6: case 9: case 11:
00514             CHECK_RANGE( 1, 30, t->day );
00515             break;
00516         case 2:
00517             CHECK_RANGE( 1, 28 + (t->year % 4 == 0), t->day );
00518             break;
00519         default:
00520             return( ret );
00521     }
00522 
00523     return( 0 );
00524 }
00525 
00526 /*
00527  * Parse an ASN1_UTC_TIME (yearlen=2) or ASN1_GENERALIZED_TIME (yearlen=4)
00528  * field.
00529  */
00530 static int x509_parse_time( unsigned char **p, size_t len, size_t yearlen,
00531                             mbedtls_x509_time *tm )
00532 {
00533     int ret;
00534 
00535     /*
00536      * Minimum length is 10 or 12 depending on yearlen
00537      */
00538     if ( len < yearlen + 8 )
00539         return ( MBEDTLS_ERR_X509_INVALID_DATE );
00540     len -= yearlen + 8;
00541 
00542     /*
00543      * Parse year, month, day, hour, minute
00544      */
00545     CHECK( x509_parse_int( p, yearlen, &tm->year ) );
00546     if ( 2 == yearlen )
00547     {
00548         if ( tm->year < 50 )
00549             tm->year += 100;
00550 
00551         tm->year += 1900;
00552     }
00553 
00554     CHECK( x509_parse_int( p, 2, &tm->mon ) );
00555     CHECK( x509_parse_int( p, 2, &tm->day ) );
00556     CHECK( x509_parse_int( p, 2, &tm->hour ) );
00557     CHECK( x509_parse_int( p, 2, &tm->min ) );
00558 
00559     /*
00560      * Parse seconds if present
00561      */
00562     if ( len >= 2 )
00563     {
00564         CHECK( x509_parse_int( p, 2, &tm->sec ) );
00565         len -= 2;
00566     }
00567     else
00568         return ( MBEDTLS_ERR_X509_INVALID_DATE );
00569 
00570     /*
00571      * Parse trailing 'Z' if present
00572      */
00573     if ( 1 == len && 'Z' == **p )
00574     {
00575         (*p)++;
00576         len--;
00577     }
00578 
00579     /*
00580      * We should have parsed all characters at this point
00581      */
00582     if ( 0 != len )
00583         return ( MBEDTLS_ERR_X509_INVALID_DATE );
00584 
00585     CHECK( x509_date_is_valid( tm ) );
00586 
00587     return ( 0 );
00588 }
00589 
00590 /*
00591  *  Time ::= CHOICE {
00592  *       utcTime        UTCTime,
00593  *       generalTime    GeneralizedTime }
00594  */
00595 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
00596                            mbedtls_x509_time *tm )
00597 {
00598     int ret;
00599     size_t len, year_len;
00600     unsigned char tag;
00601 
00602     if( ( end - *p ) < 1 )
00603         return( MBEDTLS_ERR_X509_INVALID_DATE +
00604                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00605 
00606     tag = **p;
00607 
00608     if( tag == MBEDTLS_ASN1_UTC_TIME )
00609         year_len = 2;
00610     else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME )
00611         year_len = 4;
00612     else
00613         return( MBEDTLS_ERR_X509_INVALID_DATE +
00614                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
00615 
00616     (*p)++;
00617     ret = mbedtls_asn1_get_len( p, end, &len );
00618 
00619     if( ret != 0 )
00620         return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
00621 
00622     return x509_parse_time( p, len, year_len, tm );
00623 }
00624 
00625 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig )
00626 {
00627     int ret;
00628     size_t len;
00629     int tag_type;
00630 
00631     if( ( end - *p ) < 1 )
00632         return( MBEDTLS_ERR_X509_INVALID_SIGNATURE +
00633                 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
00634 
00635     tag_type = **p;
00636 
00637     if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
00638         return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret );
00639 
00640     sig->tag = tag_type;
00641     sig->len = len;
00642     sig->p = *p;
00643 
00644     *p += len;
00645 
00646     return( 0 );
00647 }
00648 
00649 /*
00650  * Get signature algorithm from alg OID and optional parameters
00651  */
00652 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
00653                       mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
00654                       void **sig_opts )
00655 {
00656     int ret;
00657 
00658     if( *sig_opts != NULL )
00659         return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
00660 
00661     if( ( ret = mbedtls_oid_get_sig_alg( sig_oid, md_alg, pk_alg ) ) != 0 )
00662         return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + ret );
00663 
00664 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
00665     if( *pk_alg == MBEDTLS_PK_RSASSA_PSS )
00666     {
00667         mbedtls_pk_rsassa_pss_options *pss_opts;
00668 
00669         pss_opts = mbedtls_calloc( 1, sizeof( mbedtls_pk_rsassa_pss_options ) );
00670         if( pss_opts == NULL )
00671             return( MBEDTLS_ERR_X509_ALLOC_FAILED );
00672 
00673         ret = mbedtls_x509_get_rsassa_pss_params( sig_params,
00674                                           md_alg,
00675                                           &pss_opts->mgf1_hash_id,
00676                                           &pss_opts->expected_salt_len );
00677         if( ret != 0 )
00678         {
00679             mbedtls_free( pss_opts );
00680             return( ret );
00681         }
00682 
00683         *sig_opts = (void *) pss_opts;
00684     }
00685     else
00686 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
00687     {
00688         /* Make sure parameters are absent or NULL */
00689         if( ( sig_params->tag != MBEDTLS_ASN1_NULL && sig_params->tag != 0 ) ||
00690               sig_params->len != 0 )
00691         return( MBEDTLS_ERR_X509_INVALID_ALG );
00692     }
00693 
00694     return( 0 );
00695 }
00696 
00697 /*
00698  * X.509 Extensions (No parsing of extensions, pointer should
00699  * be either manually updated or extensions should be parsed!)
00700  */
00701 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
00702                   mbedtls_x509_buf *ext, int tag )
00703 {
00704     int ret;
00705     size_t len;
00706 
00707     if( *p == end )
00708         return( 0 );
00709 
00710     ext->tag = **p;
00711 
00712     if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
00713             MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ) ) != 0 )
00714         return( ret );
00715 
00716     ext->p = *p;
00717     end = *p + ext->len;
00718 
00719     /*
00720      * Extensions  ::=  SEQUENCE SIZE (1..MAX) OF Extension
00721      *
00722      * Extension  ::=  SEQUENCE  {
00723      *      extnID      OBJECT IDENTIFIER,
00724      *      critical    BOOLEAN DEFAULT FALSE,
00725      *      extnValue   OCTET STRING  }
00726      */
00727     if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
00728             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
00729         return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
00730 
00731     if( end != *p + len )
00732         return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
00733                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
00734 
00735     return( 0 );
00736 }
00737 
00738 /*
00739  * Store the name in printable form into buf; no more
00740  * than size characters will be written
00741  */
00742 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn )
00743 {
00744     int ret;
00745     size_t i, n;
00746     unsigned char c, merge = 0;
00747     const mbedtls_x509_name *name;
00748     const char *short_name = NULL;
00749     char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
00750 
00751     memset( s, 0, sizeof( s ) );
00752 
00753     name = dn;
00754     p = buf;
00755     n = size;
00756 
00757     while( name != NULL )
00758     {
00759         if( !name->oid.p )
00760         {
00761             name = name->next;
00762             continue;
00763         }
00764 
00765         if( name != dn )
00766         {
00767             ret = mbedtls_snprintf( p, n, merge ? " + " : ", " );
00768             MBEDTLS_X509_SAFE_SNPRINTF;
00769         }
00770 
00771         ret = mbedtls_oid_get_attr_short_name( &name->oid, &short_name );
00772 
00773         if( ret == 0 )
00774             ret = mbedtls_snprintf( p, n, "%s=", short_name );
00775         else
00776             ret = mbedtls_snprintf( p, n, "\?\?=" );
00777         MBEDTLS_X509_SAFE_SNPRINTF;
00778 
00779         for( i = 0; i < name->val.len; i++ )
00780         {
00781             if( i >= sizeof( s ) - 1 )
00782                 break;
00783 
00784             c = name->val.p[i];
00785             if( c < 32 || c == 127 || ( c > 128 && c < 160 ) )
00786                  s[i] = '?';
00787             else s[i] = c;
00788         }
00789         s[i] = '\0';
00790         ret = mbedtls_snprintf( p, n, "%s", s );
00791         MBEDTLS_X509_SAFE_SNPRINTF;
00792 
00793         merge = name->next_merged;
00794         name = name->next;
00795     }
00796 
00797     return( (int) ( size - n ) );
00798 }
00799 
00800 /*
00801  * Store the serial in printable form into buf; no more
00802  * than size characters will be written
00803  */
00804 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial )
00805 {
00806     int ret;
00807     size_t i, n, nr;
00808     char *p;
00809 
00810     p = buf;
00811     n = size;
00812 
00813     nr = ( serial->len <= 32 )
00814         ? serial->len  : 28;
00815 
00816     for( i = 0; i < nr; i++ )
00817     {
00818         if( i == 0 && nr > 1 && serial->p[i] == 0x0 )
00819             continue;
00820 
00821         ret = mbedtls_snprintf( p, n, "%02X%s",
00822                 serial->p[i], ( i < nr - 1 ) ? ":" : "" );
00823         MBEDTLS_X509_SAFE_SNPRINTF;
00824     }
00825 
00826     if( nr != serial->len )
00827     {
00828         ret = mbedtls_snprintf( p, n, "...." );
00829         MBEDTLS_X509_SAFE_SNPRINTF;
00830     }
00831 
00832     return( (int) ( size - n ) );
00833 }
00834 
00835 /*
00836  * Helper for writing signature algorithms
00837  */
00838 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
00839                        mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
00840                        const void *sig_opts )
00841 {
00842     int ret;
00843     char *p = buf;
00844     size_t n = size;
00845     const char *desc = NULL;
00846 
00847     ret = mbedtls_oid_get_sig_alg_desc( sig_oid, &desc );
00848     if( ret != 0 )
00849         ret = mbedtls_snprintf( p, n, "???"  );
00850     else
00851         ret = mbedtls_snprintf( p, n, "%s", desc );
00852     MBEDTLS_X509_SAFE_SNPRINTF;
00853 
00854 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
00855     if( pk_alg == MBEDTLS_PK_RSASSA_PSS )
00856     {
00857         const mbedtls_pk_rsassa_pss_options *pss_opts;
00858         const mbedtls_md_info_t *md_info, *mgf_md_info;
00859 
00860         pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
00861 
00862         md_info = mbedtls_md_info_from_type( md_alg );
00863         mgf_md_info = mbedtls_md_info_from_type( pss_opts->mgf1_hash_id );
00864 
00865         ret = mbedtls_snprintf( p, n, " (%s, MGF1-%s, 0x%02X)",
00866                               md_info ? mbedtls_md_get_name( md_info ) : "???",
00867                               mgf_md_info ? mbedtls_md_get_name( mgf_md_info ) : "???",
00868                               pss_opts->expected_salt_len );
00869         MBEDTLS_X509_SAFE_SNPRINTF;
00870     }
00871 #else
00872     ((void) pk_alg);
00873     ((void) md_alg);
00874     ((void) sig_opts);
00875 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
00876 
00877     return( (int)( size - n ) );
00878 }
00879 
00880 /*
00881  * Helper for writing "RSA key size", "EC key size", etc
00882  */
00883 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name )
00884 {
00885     char *p = buf;
00886     size_t n = buf_size;
00887     int ret;
00888 
00889     ret = mbedtls_snprintf( p, n, "%s key size", name );
00890     MBEDTLS_X509_SAFE_SNPRINTF;
00891 
00892     return( 0 );
00893 }
00894 
00895 #if defined(MBEDTLS_HAVE_TIME_DATE)
00896 /*
00897  * Set the time structure to the current time.
00898  * Return 0 on success, non-zero on failure.
00899  */
00900 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
00901 static int x509_get_current_time( mbedtls_x509_time *now )
00902 {
00903     SYSTEMTIME st;
00904 
00905     GetSystemTime( &st );
00906 
00907     now->year = st.wYear;
00908     now->mon  = st.wMonth;
00909     now->day  = st.wDay;
00910     now->hour = st.wHour;
00911     now->min  = st.wMinute;
00912     now->sec  = st.wSecond;
00913 
00914     return( 0 );
00915 }
00916 #else
00917 static int x509_get_current_time( mbedtls_x509_time *now )
00918 {
00919     struct tm *lt;
00920     mbedtls_time_t tt;
00921     int ret = 0;
00922 
00923 #if defined(MBEDTLS_THREADING_C)
00924     if( mbedtls_mutex_lock( &mbedtls_threading_gmtime_mutex ) != 0 )
00925         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00926 #endif
00927 
00928     tt = mbedtls_time( NULL );
00929     lt = gmtime( &tt );
00930 
00931     if( lt == NULL )
00932         ret = -1;
00933     else
00934     {
00935         now->year = lt->tm_year + 1900;
00936         now->mon  = lt->tm_mon  + 1;
00937         now->day  = lt->tm_mday;
00938         now->hour = lt->tm_hour;
00939         now->min  = lt->tm_min;
00940         now->sec  = lt->tm_sec;
00941     }
00942 
00943 #if defined(MBEDTLS_THREADING_C)
00944     if( mbedtls_mutex_unlock( &mbedtls_threading_gmtime_mutex ) != 0 )
00945         return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
00946 #endif
00947 
00948     return( ret );
00949 }
00950 #endif /* _WIN32 && !EFIX64 && !EFI32 */
00951 
00952 /*
00953  * Return 0 if before <= after, 1 otherwise
00954  */
00955 static int x509_check_time( const mbedtls_x509_time *before, const mbedtls_x509_time *after )
00956 {
00957     if( before->year  > after->year )
00958         return( 1 );
00959 
00960     if( before->year == after->year &&
00961         before->mon   > after->mon )
00962         return( 1 );
00963 
00964     if( before->year == after->year &&
00965         before->mon  == after->mon  &&
00966         before->day   > after->day )
00967         return( 1 );
00968 
00969     if( before->year == after->year &&
00970         before->mon  == after->mon  &&
00971         before->day  == after->day  &&
00972         before->hour  > after->hour )
00973         return( 1 );
00974 
00975     if( before->year == after->year &&
00976         before->mon  == after->mon  &&
00977         before->day  == after->day  &&
00978         before->hour == after->hour &&
00979         before->min   > after->min  )
00980         return( 1 );
00981 
00982     if( before->year == after->year &&
00983         before->mon  == after->mon  &&
00984         before->day  == after->day  &&
00985         before->hour == after->hour &&
00986         before->min  == after->min  &&
00987         before->sec   > after->sec  )
00988         return( 1 );
00989 
00990     return( 0 );
00991 }
00992 
00993 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
00994 {
00995     mbedtls_x509_time now;
00996 
00997     if( x509_get_current_time( &now ) != 0 )
00998         return( 1 );
00999 
01000     return( x509_check_time( &now, to ) );
01001 }
01002 
01003 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
01004 {
01005     mbedtls_x509_time now;
01006 
01007     if( x509_get_current_time( &now ) != 0 )
01008         return( 1 );
01009 
01010     return( x509_check_time( from, &now ) );
01011 }
01012 
01013 #else  /* MBEDTLS_HAVE_TIME_DATE */
01014 
01015 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
01016 {
01017     ((void) to);
01018     return( 0 );
01019 }
01020 
01021 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
01022 {
01023     ((void) from);
01024     return( 0 );
01025 }
01026 #endif /* MBEDTLS_HAVE_TIME_DATE */
01027 
01028 #if defined(MBEDTLS_SELF_TEST)
01029 
01030 #include "mbedtls/x509_crt.h"
01031 #include "mbedtls/certs.h"
01032 
01033 /*
01034  * Checkup routine
01035  */
01036 int mbedtls_x509_self_test( int verbose )
01037 {
01038 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA256_C)
01039     int ret;
01040     uint32_t flags;
01041     mbedtls_x509_crt cacert;
01042     mbedtls_x509_crt clicert;
01043 
01044     if( verbose != 0 )
01045         mbedtls_printf( "  X.509 certificate load: " );
01046 
01047     mbedtls_x509_crt_init( &clicert );
01048 
01049     ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
01050                            mbedtls_test_cli_crt_len );
01051     if( ret != 0 )
01052     {
01053         if( verbose != 0 )
01054             mbedtls_printf( "failed\n" );
01055 
01056         return( ret );
01057     }
01058 
01059     mbedtls_x509_crt_init( &cacert );
01060 
01061     ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_ca_crt,
01062                           mbedtls_test_ca_crt_len );
01063     if( ret != 0 )
01064     {
01065         if( verbose != 0 )
01066             mbedtls_printf( "failed\n" );
01067 
01068         return( ret );
01069     }
01070 
01071     if( verbose != 0 )
01072         mbedtls_printf( "passed\n  X.509 signature verify: ");
01073 
01074     ret = mbedtls_x509_crt_verify( &clicert, &cacert, NULL, NULL, &flags, NULL, NULL );
01075     if( ret != 0 )
01076     {
01077         if( verbose != 0 )
01078             mbedtls_printf( "failed\n" );
01079 
01080         return( ret );
01081     }
01082 
01083     if( verbose != 0 )
01084         mbedtls_printf( "passed\n\n");
01085 
01086     mbedtls_x509_crt_free( &cacert  );
01087     mbedtls_x509_crt_free( &clicert );
01088 
01089     return( 0 );
01090 #else
01091     ((void) verbose);
01092     return( 0 );
01093 #endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */
01094 }
01095 
01096 #endif /* MBEDTLS_SELF_TEST */
01097 
01098 #endif /* MBEDTLS_X509_USE_C */