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Add x509_crt_verify_info()

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Manuel Pégourié-Gonnard 2015-04-17 16:14:32 +02:00
parent 23c0608e28
commit 39a183a629
6 changed files with 115 additions and 8 deletions
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1
ChangeLog
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@ -5,6 +5,7 @@ mbed TLS ChangeLog (Sorted per branch, date)
Security
Features
* Add x509_crt_verify_info() to display certificate verification results.
* Add support for reading DH parameters with privateValueLength included
(contributed by Daniel Kahn Gillmor).
* Add support for bit strings in X.509 names (request by Fredrik Axelsson).

8
include/polarssl/x509.h
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@ -82,17 +82,21 @@
* \name X509 Verify codes
* \{
*/
/* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
#define BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
#define BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
#define BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
#define BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
#define BADCRL_NOT_TRUSTED 0x10 /**< CRL is not correctly signed by the trusted CA. */
#define BADCRL_EXPIRED 0x20 /**< CRL is expired. */
#define BADCRL_NOT_TRUSTED 0x10 /**< The CRL is not correctly signed by the trusted CA. */
#define BADCRL_EXPIRED 0x20 /**< The CRL is expired. */
#define BADCERT_MISSING 0x40 /**< Certificate was missing. */
#define BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
#define BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
#define BADCERT_FUTURE 0x0200 /**< The certificate validity starts in the future. */
#define BADCRL_FUTURE 0x0400 /**< The CRL is from the future */
#define BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
#define BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
#define BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
/* \} name */
/* \} addtogroup x509_module */

26
include/polarssl/x509_crt.h
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@ -202,6 +202,21 @@ int x509_crt_parse_path( x509_crt *chain, const char *path );
int x509_crt_info( char *buf, size_t size, const char *prefix,
const x509_crt *crt );
/**
* \brief Returns an informational string about the
* verification status of a certificate.
*
* \param buf Buffer to write to
* \param size Maximum size of buffer
* \param prefix A line prefix
* \param flags Verification flags created by x509_crt_verify()
*
* \return The amount of data written to the buffer, or -1 in
* case of an error.
*/
int x509_crt_verify_info( char *buf, size_t size, const char *prefix,
int flags );
/**
* \brief Verify the certificate signature
*
@ -219,6 +234,9 @@ int x509_crt_info( char *buf, size_t size, const char *prefix,
* are also returned to the application. The function should
* return 0 for anything but a fatal error.
*
* \note In case verification failed, the results can be displayed
* using \c x509_crt_verify_info()
*
* \param crt a certificate to be verified
* \param trust_ca the trusted CA chain
* \param ca_crl the CRL chain for trusted CA's
@ -229,12 +247,8 @@ int x509_crt_info( char *buf, size_t size, const char *prefix,
* \param p_vrfy verification parameter
*
* \return 0 if successful or POLARSSL_ERR_X509_SIG_VERIFY_FAILED,
* in which case *flags will have one or more of
* the following values set:
* BADCERT_EXPIRED --
* BADCERT_REVOKED --
* BADCERT_CN_MISMATCH --
* BADCERT_NOT_TRUSTED
* in which case *flags will have one or more BADCERT_XXX or
* BADCRL_XXX flags set,
* or another error in case of a fatal error encountered
* during the verification process.
*/

51
library/x509_crt.c
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@ -1382,6 +1382,57 @@ int x509_crt_info( char *buf, size_t size, const char *prefix,
return( (int) ( size - n ) );
}
struct x509_crt_verify_string {
int code;
const char *string;
};
static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
{ BADCERT_EXPIRED, "The certificate validity has expired" },
{ BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" },
{ BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" },
{ BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" },
{ BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" },
{ BADCRL_EXPIRED, "The CRL is expired" },
{ BADCERT_MISSING, "Certificate was missing" },
{ BADCERT_SKIP_VERIFY, "Certificate verification was skipped" },
{ BADCERT_OTHER, "Other reason (can be used by verify callback)" },
{ BADCERT_FUTURE, "The certificate validity starts in the future" },
{ BADCRL_FUTURE, "The CRL is from the future" },
{ BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" },
{ BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" },
{ BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" },
{ 0, NULL }
};
int x509_crt_verify_info( char *buf, size_t size, const char *prefix,
int flags )
{
int ret;
const struct x509_crt_verify_string *cur;
char *p = buf;
size_t n = size;
for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
{
if( ( flags & cur->code ) == 0 )
continue;
ret = polarssl_snprintf( p, n, "%s%s\n", prefix, cur->string );
SAFE_SNPRINTF();
flags ^= cur->code;
}
if( flags != 0 )
{
ret = polarssl_snprintf( p, n, "%sUnknown reason "
"(this should not happen)\n", prefix );
SAFE_SNPRINTF();
}
return( (int) ( size - n ) );
}
#if defined(POLARSSL_X509_CHECK_KEY_USAGE)
int x509_crt_check_key_usage( const x509_crt *crt, int usage )
{

21
tests/suites/test_suite_x509parse.data
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@ -262,6 +262,27 @@ X509 CSR Information RSA-PSS with SHA512
depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_X509_RSASSA_PSS_SUPPORT:POLARSSL_SHA512_C
x509_csr_info:"data_files/server9.req.sha512":"CSR version \: 1\nsubject name \: C=NL, O=PolarSSL, CN=localhost\nsigned using \: RSASSA-PSS (SHA512, MGF1-SHA512, 0x3E)\nRSA key size \: 1024 bits\n"
X509 Verify Information: empty
x509_verify_info:0:"":""
X509 Verify Information: one issue
x509_verify_info:BADCERT_MISSING:"":"Certificate was missing\n"
X509 Verify Information: two issues
x509_verify_info:BADCERT_EXPIRED | BADCRL_EXPIRED:"":"The certificate validity has expired\nThe CRL is expired\n"
X509 Verify Information: two issues, one unknown
x509_verify_info:BADCERT_OTHER | 0x8000:"":"Other reason (can be used by verify callback)\nUnknown reason (this should not happen)\n"
X509 Verify Information: empty, with prefix
x509_verify_info:0:" ! ":""
X509 Verify Information: one issue, with prefix
x509_verify_info:BADCERT_MISSING:" ! ":" ! Certificate was missing\n"
X509 Verify Information: two issues, with prefix
x509_verify_info:BADCERT_EXPIRED | BADCRL_EXPIRED:" ! ":" ! The certificate validity has expired\n ! The CRL is expired\n"
X509 Get Distinguished Name #1
depends_on:POLARSSL_PEM_PARSE_C:POLARSSL_RSA_C
x509_dn_gets:"data_files/server1.crt":"subject":"C=NL, O=PolarSSL, CN=PolarSSL Server 1"

16
tests/suites/test_suite_x509parse.function
View File

@ -102,6 +102,22 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_X509_CRT_PARSE_C */
void x509_verify_info( int flags, char *prefix, char *result_str )
{
char buf[2000];
int res;
memset( buf, 0, sizeof( buf ) );
res = x509_crt_verify_info( buf, sizeof( buf ), prefix, flags );
TEST_ASSERT( res >= 0 );
TEST_ASSERT( strcmp( buf, result_str ) == 0 );
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_FS_IO:POLARSSL_X509_CRT_PARSE_C:POLARSSL_X509_CRL_PARSE_C */
void x509_verify( char *crt_file, char *ca_file, char *crl_file,
char *cn_name_str, int result, int flags_result,