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Add POLARSSL_X509_MAX_INTERMEDIATE_CA

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Manuel Pégourié-Gonnard 2014-11-20 17:12:15 +01:00
parent 6a095d2383
commit 4cdb3babad
4 changed files with 25 additions and 0 deletions
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2
ChangeLog
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@ -22,6 +22,8 @@ Bugfix
Changes Changes
* Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined. * Blind RSA private operations even when POLARSSL_RSA_NO_CRT is defined.
* Forbid repeated extensions in X.509 certificates. * Forbid repeated extensions in X.509 certificates.
* Add compile-time option POLARSSL_X509_MAX_INTERMEDIATE_CA to limit the
length of an X.509 verification chain (default = 8).
= Version 1.2.12 released 2014-10-24 = Version 1.2.12 released 2014-10-24

4
include/polarssl/config.h
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@ -1021,6 +1021,10 @@
// //
#define SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */ #define SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */
// X509 options
//
#define POLARSSL_X509_MAX_INTERMEDIATE_CA 8 /**< Maximum number of intermediate CAs in a verification chain. */
#endif /* POLARSSL_CONFIG_OPTIONS */ #endif /* POLARSSL_CONFIG_OPTIONS */
/* \} name */ /* \} name */

12
include/polarssl/x509.h
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@ -36,6 +36,18 @@
* \{ * \{
*/ */
#if !defined(POLARSSL_CONFIG_OPTIONS)
/**
* Maximum number of intermediate CAs in a verification chain.
* That is, maximum length of the chain, excluding the end-entity certificate
* and the trusted root certificate.
*
* Set this to a low value to prevent an adversary from making you waste
* resources verifying an overlong certificate chain.
*/
#define POLARSSL_X509_MAX_INTERMEDIATE_CA 8
#endif
/** /**
* \name X509 Error codes * \name X509 Error codes
* \{ * \{

7
library/x509parse.c
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@ -3502,6 +3502,13 @@ static int x509parse_verify_child(
unsigned char hash[64]; unsigned char hash[64];
x509_cert *grandparent; x509_cert *grandparent;
/* path_cnt is 0 for the first intermediate CA */
if( 1 + path_cnt > POLARSSL_X509_MAX_INTERMEDIATE_CA )
{
*flags |= BADCERT_NOT_TRUSTED;
return( POLARSSL_ERR_X509_CERT_VERIFY_FAILED );
}
if( x509parse_time_expired( &child->valid_to ) ) if( x509parse_time_expired( &child->valid_to ) )
*flags |= BADCERT_EXPIRED; *flags |= BADCERT_EXPIRED;