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Merge remote-tracking branch 'origin/pr/577' into baremetal

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Simon Butcher 2019-06-17 17:46:32 +01:00
parent 5aca94eafe 49f83e6748
commit 62d03b2779
9 changed files with 139 additions and 36 deletions
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8
ChangeLog
View file

@ -24,6 +24,14 @@ Features
mbedtls_ssl_session_load() to allow serializing a session, for example to
store it in non-volatile storage, and later using it for TLS session
resumption.
* Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`
which allows copy-less parsing of DER encoded X.509 CRTs,
at the cost of additional lifetime constraints on the input
buffer, but at the benefit of reduced RAM consumption.
API Changes
* Add a new X.509 API call `mbedtls_x509_parse_der_nocopy()`.
See the Features section for more information.
Bugfix
* Server's RSA certificate in certs.c was SHA-1 signed. In the default

56
include/mbedtls/x509_crt.h
View file

@ -52,6 +52,8 @@ extern "C" {
*/
typedef struct mbedtls_x509_crt
{
int own_buffer; /**< Indicates if \c raw is owned
* by the structure or not. */
mbedtls_x509_buf raw; /**< The raw certificate data (DER). */
mbedtls_x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
@ -220,15 +222,57 @@ extern const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb;
/**
* \brief Parse a single DER formatted certificate and add it
* to the chained list.
* to the end of the provided chained list.
*
* \param chain points to the start of the chain
* \param buf buffer holding the certificate DER data
* \param buflen size of the buffer
* \param chain The pointer to the start of the CRT chain to attach to.
* When parsing the first CRT in a chain, this should point
* to an instance of ::mbedtls_x509_crt initialized through
* mbedtls_x509_crt_init().
* \param buf The buffer holding the DER encoded certificate.
* \param buflen The size in Bytes of \p buf.
*
* \return 0 if successful, or a specific X509 or PEM error code
* \note This function makes an internal copy of the CRT buffer
* \p buf. In particular, \p buf may be destroyed or reused
* after this call returns. To avoid duplicating the CRT
* buffer (at the cost of stricter lifetime constraints),
* use mbedtls_x509_crt_parse_der_nocopy() instead.
*
* \return \c 0 if successful.
* \return A negative error code on failure.
*/
int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf,
int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen );
/**
* \brief Parse a single DER formatted certificate and add it
* to the end of the provided chained list. This is a
* variant of mbedtls_x509_crt_parse_der() which takes
* temporary ownership of the CRT buffer until the CRT
* is destroyed.
*
* \param chain The pointer to the start of the CRT chain to attach to.
* When parsing the first CRT in a chain, this should point
* to an instance of ::mbedtls_x509_crt initialized through
* mbedtls_x509_crt_init().
* \param buf The address of the readable buffer holding the DER encoded
* certificate to use. On success, this buffer must be
* retained and not be changed for the liftetime of the
* CRT chain \p chain, that is, until \p chain is destroyed
* through a call to mbedtls_x509_crt_free().
* \param buflen The size in Bytes of \p buf.
*
* \note This call is functionally equivalent to
* mbedtls_x509_crt_parse_der(), but it avoids creating a
* copy of the input buffer at the cost of stronger lifetime
* constraints. This is useful in constrained environments
* where duplication of the CRT cannot be tolerated.
*
* \return \c 0 if successful.
* \return A negative error code on failure.
*/
int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen );
/**

61
library/x509_crt.c
View file

@ -829,8 +829,10 @@ static int x509_get_crt_ext( unsigned char **p,
/*
* Parse and fill a single X.509 certificate in DER format
*/
static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *buf,
size_t buflen )
static int x509_crt_parse_der_core( mbedtls_x509_crt *crt,
const unsigned char *buf,
size_t buflen,
int make_copy )
{
int ret;
size_t len;
@ -847,7 +849,7 @@ static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *
if( crt == NULL || buf == NULL )
return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
// Use the original buffer until we figure out actual length
/* Use the original buffer until we figure out actual length. */
p = (unsigned char*) buf;
len = buflen;
end = p + len;
@ -865,25 +867,26 @@ static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *
return( MBEDTLS_ERR_X509_INVALID_FORMAT );
}
if( len > (size_t) ( end - p ) )
{
mbedtls_x509_crt_free( crt );
return( MBEDTLS_ERR_X509_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
}
crt_end = p + len;
// Create and populate a new buffer for the raw field
end = crt_end = p + len;
crt->raw.len = crt_end - buf;
if( make_copy != 0 )
{
/* Create and populate a new buffer for the raw field. */
crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len );
if( p == NULL )
if( crt->raw.p == NULL )
return( MBEDTLS_ERR_X509_ALLOC_FAILED );
memcpy( p, buf, crt->raw.len );
memcpy( crt->raw.p, buf, crt->raw.len );
crt->own_buffer = 1;
// Direct pointers to the new buffer
p += crt->raw.len - len;
end = crt_end = p + len;
}
else
{
crt->raw.p = (unsigned char*) buf;
crt->own_buffer = 0;
}
/*
* TBSCertificate ::= SEQUENCE {
@ -1086,8 +1089,10 @@ static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *
* Parse one X.509 certificate in DER format from a buffer and add them to a
* chained list
*/
int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf,
size_t buflen )
static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen,
int make_copy )
{
int ret;
mbedtls_x509_crt *crt = chain, *prev = NULL;
@ -1119,7 +1124,7 @@ int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *bu
crt = crt->next;
}
if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 )
if( ( ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy ) ) != 0 )
{
if( prev )
prev->next = NULL;
@ -1133,11 +1138,27 @@ int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *bu
return( 0 );
}
int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen )
{
return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0 ) );
}
int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen )
{
return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1 ) );
}
/*
* Parse one or more PEM certificates from a buffer and add them to the chained
* list
*/
int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen )
int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain,
const unsigned char *buf,
size_t buflen )
{
#if defined(MBEDTLS_PEM_PARSE_C)
int success = 0, first_error = 0, total_failed = 0;
@ -2675,7 +2696,7 @@ void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
mbedtls_free( seq_prv );
}
if( cert_cur->raw.p != NULL )
if( cert_cur->raw.p != NULL && cert_cur->own_buffer )
{
mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len );
mbedtls_free( cert_cur->raw.p );

8
tests/data_files/Makefile
View file

@ -44,7 +44,9 @@ all_intermediate += test-ca.req.sha256
test-ca.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
$(MBEDTLS_CERT_WRITE) is_ca=1 serial=3 request_file=test-ca.req.sha256 selfsign=1 issuer_name="C=NL,O=PolarSSL,CN=PolarSSL Test CA" issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20110212144400 not_after=20210212144400 md=SHA1 version=3 output_file=$@
all_final += test-ca.crt
test-ca.der: test-ca.crt
$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
all_final += test-ca.crt test-ca.der
test-ca-sha1.crt: $(test_ca_key_file_rsa) test-ca.req.sha256
$(MBEDTLS_CERT_WRITE) is_ca=1 serial=3 request_file=test-ca.req.sha256 selfsign=1 issuer_name="C=NL,O=PolarSSL,CN=PolarSSL Test CA" issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20110212144400 not_after=20210212144400 md=SHA1 version=3 output_file=$@
@ -903,7 +905,9 @@ server1_all: server1.crt server1.noauthid.crt server1.crt.openssl server1.v1.crt
server2.crt: server2.req.sha256
$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=2 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20110212144406 not_after=20210212144406 md=SHA1 version=3 output_file=$@
all_final += server2.crt
server2.der: server2.crt
$(OPENSSL) x509 -inform PEM -in $< -outform DER -out $@
all_final += server2.crt server2.der
server2-sha256.crt: server2.req.sha256
$(MBEDTLS_CERT_WRITE) request_file=server2.req.sha256 serial=2 issuer_crt=$(test_ca_crt) issuer_key=$(test_ca_key_file_rsa) issuer_pwd=$(test_ca_pwd_rsa) not_before=20110212144406 not_after=20210212144406 md=SHA256 version=3 output_file=$@

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tests/data_files/server2.der Normal file
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tests/data_files/test-ca.der Normal file
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12
tests/suites/test_suite_x509parse.data
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@ -2,14 +2,26 @@ X509 Certificate information #1
depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/server1.crt":"cert. version \: 3\nserial number \: 01\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=PolarSSL Server 1\nissued on \: 2011-02-12 14\:44\:06\nexpires on \: 2021-02-12 14\:44\:06\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=false\n"
X509 Certificate information #1 (DER)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/server1.der":"cert. version \: 3\nserial number \: 01\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=PolarSSL Server 1\nissued on \: 2011-02-12 14\:44\:06\nexpires on \: 2021-02-12 14\:44\:06\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=false\n"
X509 Certificate information #2
depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/server2.crt":"cert. version \: 3\nserial number \: 02\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=localhost\nissued on \: 2011-02-12 14\:44\:06\nexpires on \: 2021-02-12 14\:44\:06\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=false\n"
X509 Certificate information #2 (DER)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/server2.der":"cert. version \: 3\nserial number \: 02\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=localhost\nissued on \: 2011-02-12 14\:44\:06\nexpires on \: 2021-02-12 14\:44\:06\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=false\n"
X509 Certificate information #3
depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/test-ca.crt":"cert. version \: 3\nserial number \: 03\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nissued on \: 2011-02-12 14\:44\:00\nexpires on \: 2021-02-12 14\:44\:00\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=true\n"
X509 Certificate information #3 (DER)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA1_C
x509_cert_info:"data_files/test-ca.der":"cert. version \: 3\nserial number \: 03\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nissued on \: 2011-02-12 14\:44\:00\nexpires on \: 2021-02-12 14\:44\:00\nsigned using \: RSA with SHA1\nRSA key size \: 2048 bits\nbasic constraints \: CA=true\n"
X509 Certificate information MD2 Digest
depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_MD2_C
x509_cert_info:"data_files/cert_md2.crt":"cert. version \: 3\nserial number \: 09\nissuer name \: C=NL, O=PolarSSL, CN=PolarSSL Test CA\nsubject name \: C=NL, O=PolarSSL, CN=PolarSSL Cert MD2\nissued on \: 2009-07-12 10\:56\:59\nexpires on \: 2011-07-12 10\:56\:59\nsigned using \: RSA with MD2\nRSA key size \: 2048 bits\nbasic constraints \: CA=false\n"

16
tests/suites/test_suite_x509parse.function
View file

@ -505,8 +505,22 @@ void x509parse_crt( data_t * buf, char * result_str, int result )
mbedtls_x509_crt_init( &crt );
memset( output, 0, 2000 );
TEST_ASSERT( mbedtls_x509_crt_parse_der( &crt, buf->x, buf->len ) == ( result ) );
if( ( result ) == 0 )
{
res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
TEST_ASSERT( mbedtls_x509_crt_parse( &crt, buf->x, buf->len ) == ( result ) );
TEST_ASSERT( res != -1 );
TEST_ASSERT( res != -2 );
TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
}
mbedtls_x509_crt_free( &crt );
mbedtls_x509_crt_init( &crt );
memset( output, 0, 2000 );
TEST_ASSERT( mbedtls_x509_crt_parse_der_nocopy( &crt, buf->x, buf->len ) == ( result ) );
if( ( result ) == 0 )
{
res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );