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Move x509_name_cmp() from x509_crt.c to x509.c

Browse source 
This is to prepare a subsequent rewrite of `x509_name_cmp()` in terms
of the X.509 name traversal helper `x509_set_sequence_iterate()`
from `x509.c`.
This commit is contained in:
Hanno Becker 2019-02-20 12:41:55 +00:00
parent 83cd8676fa
commit 88de342c95
3 changed files with 108 additions and 103 deletions
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3
include/mbedtls/x509.h
View file

@ -303,6 +303,9 @@ int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
mbedtls_x509_time *t );
int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *serial );
int mbedtls_x509_name_cmp( const mbedtls_x509_name *a,
const mbedtls_x509_name *b );
int mbedtls_x509_memcasecmp( const void *s1, const void *s2, size_t len );
int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *ext, int tag );

99
library/x509.c
View file

@ -484,6 +484,105 @@ int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
return( 0 );
}
/*
* Like memcmp, but case-insensitive and always returns -1 if different
*/
int mbedtls_x509_memcasecmp( const void *s1, const void *s2, size_t len )
{
size_t i;
unsigned char diff;
const unsigned char *n1 = s1, *n2 = s2;
for( i = 0; i < len; i++ )
{
diff = n1[i] ^ n2[i];
if( diff == 0 )
continue;
if( diff == 32 &&
( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
{
continue;
}
return( -1 );
}
return( 0 );
}
/*
* Compare two X.509 strings, case-insensitive, and allowing for some encoding
* variations (but not all).
*
* Return 0 if equal, -1 otherwise.
*/
static int x509_string_cmp( const mbedtls_x509_buf *a,
const mbedtls_x509_buf *b )
{
if( a->tag == b->tag &&
a->len == b->len &&
memcmp( a->p, b->p, b->len ) == 0 )
{
return( 0 );
}
if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
a->len == b->len &&
mbedtls_x509_memcasecmp( a->p, b->p, b->len ) == 0 )
{
return( 0 );
}
return( -1 );
}
/*
* Compare two X.509 Names (aka rdnSequence).
*
* See RFC 5280 section 7.1, though we don't implement the whole algorithm:
* we sometimes return unequal when the full algorithm would return equal,
* but never the other way. (In particular, we don't do Unicode normalisation
* or space folding.)
*
* Return 0 if equal, -1 otherwise.
*/
int mbedtls_x509_name_cmp( const mbedtls_x509_name *a,
const mbedtls_x509_name *b )
{
/* Avoid recursion, it might not be optimised by the compiler */
while( a != NULL || b != NULL )
{
if( a == NULL || b == NULL )
return( -1 );
/* type */
if( a->oid.tag != b->oid.tag ||
a->oid.len != b->oid.len ||
memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
{
return( -1 );
}
/* value */
if( x509_string_cmp( &a->val, &b->val ) != 0 )
return( -1 );
/* structure of the list of sets */
if( a->next_merged != b->next_merged )
return( -1 );
a = a->next;
b = b->next;
}
/* a == NULL == b */
return( 0 );
}
static int x509_parse_int( unsigned char **p, size_t n, int *res )
{
*res = 0;

109
library/x509_crt.c
View file

@ -227,35 +227,6 @@ static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
return( -1 );
}
/*
* Like memcmp, but case-insensitive and always returns -1 if different
*/
static int x509_memcasecmp( const void *s1, const void *s2, size_t len )
{
size_t i;
unsigned char diff;
const unsigned char *n1 = s1, *n2 = s2;
for( i = 0; i < len; i++ )
{
diff = n1[i] ^ n2[i];
if( diff == 0 )
continue;
if( diff == 32 &&
( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
{
continue;
}
return( -1 );
}
return( 0 );
}
/*
* Return 0 if name matches wildcard, -1 otherwise
*/
@ -281,7 +252,7 @@ static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
return( -1 );
if( cn_len - cn_idx == name->len - 1 &&
x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
mbedtls_x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
{
return( 0 );
}
@ -289,74 +260,6 @@ static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
return( -1 );
}
/*
* Compare two X.509 strings, case-insensitive, and allowing for some encoding
* variations (but not all).
*
* Return 0 if equal, -1 otherwise.
*/
static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b )
{
if( a->tag == b->tag &&
a->len == b->len &&
memcmp( a->p, b->p, b->len ) == 0 )
{
return( 0 );
}
if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
a->len == b->len &&
x509_memcasecmp( a->p, b->p, b->len ) == 0 )
{
return( 0 );
}
return( -1 );
}
/*
* Compare two X.509 Names (aka rdnSequence).
*
* See RFC 5280 section 7.1, though we don't implement the whole algorithm:
* we sometimes return unequal when the full algorithm would return equal,
* but never the other way. (In particular, we don't do Unicode normalisation
* or space folding.)
*
* Return 0 if equal, -1 otherwise.
*/
static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b )
{
/* Avoid recursion, it might not be optimised by the compiler */
while( a != NULL || b != NULL )
{
if( a == NULL || b == NULL )
return( -1 );
/* type */
if( a->oid.tag != b->oid.tag ||
a->oid.len != b->oid.len ||
memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
{
return( -1 );
}
/* value */
if( x509_string_cmp( &a->val, &b->val ) != 0 )
return( -1 );
/* structure of the list of sets */
if( a->next_merged != b->next_merged )
return( -1 );
a = a->next;
b = b->next;
}
/* a == NULL == b */
return( 0 );
}
/*
* Reset (init or clear) a verify_chain
*/
@ -1838,7 +1741,7 @@ static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
while( crl_list != NULL )
{
if( crl_list->version == 0 ||
x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 )
mbedtls_x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 )
{
crl_list = crl_list->next;
continue;
@ -1959,7 +1862,7 @@ static int x509_crt_check_parent( const mbedtls_x509_crt *child,
int need_ca_bit;
/* Parent must be the issuer */
if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
if( mbedtls_x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
return( -1 );
/* Parent must have the basicConstraints CA bit set as a general rule */
@ -2225,7 +2128,7 @@ static int x509_crt_check_ee_locally_trusted(
mbedtls_x509_crt *cur;
/* must be self-issued */
if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 )
if( mbedtls_x509_name_cmp( &crt->issuer, &crt->subject ) != 0 )
return( -1 );
/* look for an exact match with trusted cert */
@ -2390,7 +2293,7 @@ find_parent:
* These can occur with some strategies for key rollover, see [SIRO],
* and should be excluded from max_pathlen checks. */
if( ver_chain->len != 1 &&
x509_name_cmp( &child->issuer, &child->subject ) == 0 )
mbedtls_x509_name_cmp( &child->issuer, &child->subject ) == 0 )
{
self_cnt++;
}
@ -2435,7 +2338,7 @@ static int x509_crt_check_cn( const mbedtls_x509_buf *name,
{
/* try exact match */
if( name->len == cn_len &&
x509_memcasecmp( cn, name->p, cn_len ) == 0 )
mbedtls_x509_memcasecmp( cn, name->p, cn_len ) == 0 )
{
return( 0 );
}