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Create cert profile API (unimplemented yet)

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-06-15 10:39:46 +02:00
parent bc7bbbc85a
commit 9505164ef4
4 changed files with 101 additions and 11 deletions
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7
include/mbedtls/x509.h
View File

@ -97,6 +97,13 @@
#define MBEDTLS_X509_BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
#define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
#define MBEDTLS_X509_BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
#define MBEDTLS_X509_BADCERT_BAD_MD 0x4000 /**< The certificate is signed with an unacceptable hash. */
#define MBEDTLS_X509_BADCERT_BAD_PK 0x8000 /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
#define MBEDTLS_X509_BADCERT_BAD_KEY 0x010000 /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
#define MBEDTLS_X509_BADCRL_BAD_MD 0x020000 /**< The CRL is signed with an unacceptable hash. */
#define MBEDTLS_X509_BADCRL_BAD_PK 0x040000 /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
#define MBEDTLS_X509_BADCRL_BAD_KEY 0x080000 /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
/* \} name */
/* \} addtogroup x509_module */

48
include/mbedtls/x509_crt.h
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@ -94,6 +94,20 @@ typedef struct mbedtls_x509_crt
}
mbedtls_x509_crt;
/*
* Security profile for certificate verification
*
* All lists are terminated by the respective _NONE value.
*/
typedef struct
{
const mbedtls_md_type_t *allowed_mds; /**< MDs for signatures */
const mbedtls_pk_type_t *allowed_pks; /**< PK algs for signatures */
size_t rsa_min_bitlen; /**< Minimum size for RSA keys */
const mbedtls_ecp_group *allowed_curves;/**< Elliptic curves for ECDSA */
}
mbedtls_x509_crt_profile;
#define MBEDTLS_X509_CRT_VERSION_1 0
#define MBEDTLS_X509_CRT_VERSION_2 1
#define MBEDTLS_X509_CRT_VERSION_3 2
@ -232,6 +246,9 @@ int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
* \note In case verification failed, the results can be displayed
* using \c mbedtls_x509_crt_verify_info()
*
* \note Same as \c mbedtls_x509_crt_verify_with_profile() with the
* default security profile.
*
* \param crt a certificate to be verified
* \param trust_ca the trusted CA chain
* \param ca_crl the CRL chain for trusted CA's
@ -255,6 +272,37 @@ int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy );
/**
* \brief Verify the certificate signature according to profile
*
* \note Same as \c mbedtls_x509_crt_verify(), but with explicit
* security profile.
*
* \param crt a certificate to be verified
* \param trust_ca the trusted CA chain
* \param ca_crl the CRL chain for trusted CA's
* \param profile security profile for verification
* \param cn expected Common Name (can be set to
* NULL if the CN must not be verified)
* \param flags result of the verification
* \param f_vrfy verification function
* \param p_vrfy verification parameter
*
* \return 0 if successful or MBEDTLS_ERR_X509_CERT_VERIFY_FAILED
* in which case *flags will have one or more
* MBEDTLS_X509_BADCERT_XXX or MBEDTLS_X509_BADCRL_XXX flags
* set,
* or another error in case of a fatal error encountered
* during the verification process.
*/
int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
mbedtls_x509_crt *trust_ca,
mbedtls_x509_crl *ca_crl,
const mbedtls_x509_crt_profile *profile,
const char *cn, uint32_t *flags,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy );
#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
/**
* \brief Check usage of certificate against keyUsage extension.

55
library/x509_crt.c
View File

@ -1401,6 +1401,12 @@ static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
{ MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" },
{ MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" },
{ MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" },
{ MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." },
{ MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
{ MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." },
{ MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." },
{ MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
{ MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." },
{ 0, NULL }
};
@ -1502,7 +1508,8 @@ int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509
* Check that the given certificate is valid according to the CRL.
*/
static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
mbedtls_x509_crl *crl_list)
mbedtls_x509_crl *crl_list,
const mbedtls_x509_crt_profile *profile )
{
int flags = 0;
unsigned char hash[MBEDTLS_MD_MAX_SIZE];
@ -1554,6 +1561,8 @@ static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash );
(void) profile; /* WIP:TODO: check profile */
if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
crl_list->sig_md, hash, mbedtls_md_get_size( md_info ),
crl_list->sig.p, crl_list->sig.len ) != 0 )
@ -1764,7 +1773,9 @@ static int x509_crt_check_parent( const mbedtls_x509_crt *child,
static int x509_crt_verify_top(
mbedtls_x509_crt *child, mbedtls_x509_crt *trust_ca,
mbedtls_x509_crl *ca_crl, int path_cnt, uint32_t *flags,
mbedtls_x509_crl *ca_crl,
const mbedtls_x509_crt_profile *profile,
int path_cnt, uint32_t *flags,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
@ -1796,6 +1807,8 @@ static int x509_crt_verify_top(
else
mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash );
(void) profile; /* WIP:TODO: check profile */
for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next )
{
if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 )
@ -1846,7 +1859,7 @@ static int x509_crt_verify_top(
{
#if defined(MBEDTLS_X509_CRL_PARSE_C)
/* Check trusted CA's CRL for the chain's top crt */
*flags |= x509_crt_verifycrl( child, trust_ca, ca_crl );
*flags |= x509_crt_verifycrl( child, trust_ca, ca_crl, profile );
#else
((void) ca_crl);
#endif
@ -1880,8 +1893,10 @@ static int x509_crt_verify_top(
}
static int x509_crt_verify_child(
mbedtls_x509_crt *child, mbedtls_x509_crt *parent, mbedtls_x509_crt *trust_ca,
mbedtls_x509_crl *ca_crl, int path_cnt, uint32_t *flags,
mbedtls_x509_crt *child, mbedtls_x509_crt *parent,
mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl,
const mbedtls_x509_crt_profile *profile,
int path_cnt, uint32_t *flags,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
@ -1891,6 +1906,8 @@ static int x509_crt_verify_child(
mbedtls_x509_crt *grandparent;
const mbedtls_md_info_t *md_info;
(void) profile; /* WIP */
/* path_cnt is 0 for the first intermediate CA */
if( 1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
{
@ -1914,6 +1931,8 @@ static int x509_crt_verify_child(
}
else
{
(void) profile; /* WIP:TODO: check profile */
mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash );
if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
@ -1926,7 +1945,7 @@ static int x509_crt_verify_child(
#if defined(MBEDTLS_X509_CRL_PARSE_C)
/* Check trusted CA's CRL for the given crt */
*flags |= x509_crt_verifycrl(child, parent, ca_crl);
*flags |= x509_crt_verifycrl(child, parent, ca_crl, profile );
#endif
/* Look for a grandparent upwards the chain */
@ -1942,14 +1961,14 @@ static int x509_crt_verify_child(
/* Is our parent part of the chain or at the top? */
if( grandparent != NULL )
{
ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl,
ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl, profile,
path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
else
{
ret = x509_crt_verify_top( parent, trust_ca, ca_crl,
ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile,
path_cnt + 1, &parent_flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
@ -1974,6 +1993,22 @@ int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
const char *cn, uint32_t *flags,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
return( mbedtls_x509_crt_verify_with_profile( crt, trust_ca, ca_crl,
NULL /* WIP */, cn, flags, f_vrfy, p_vrfy ) );
}
/*
* Verify the certificate validity, with profile
*/
int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
mbedtls_x509_crt *trust_ca,
mbedtls_x509_crl *ca_crl,
const mbedtls_x509_crt_profile *profile,
const char *cn, uint32_t *flags,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
size_t cn_len;
int ret;
@ -2044,14 +2079,14 @@ int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
/* Are we part of the chain or at the top? */
if( parent != NULL )
{
ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl,
ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile,
pathlen, flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );
}
else
{
ret = x509_crt_verify_top( crt, trust_ca, ca_crl,
ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile,
pathlen, flags, f_vrfy, p_vrfy );
if( ret != 0 )
return( ret );

2
tests/suites/test_suite_x509parse.data
View File

@ -272,7 +272,7 @@ X509 Verify Information: two issues
x509_verify_info:MBEDTLS_X509_BADCERT_EXPIRED | MBEDTLS_X509_BADCRL_EXPIRED:"":"The certificate validity has expired\nThe CRL is expired\n"
X509 Verify Information: two issues, one unknown
x509_verify_info:MBEDTLS_X509_BADCERT_OTHER | 0x8000:"":"Other reason (can be used by verify callback)\nUnknown reason (this should not happen)\n"
x509_verify_info:MBEDTLS_X509_BADCERT_OTHER | 0x80000000:"":"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:" ! ":""