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Fix use of pem_read_buffer() in PK, DHM and X509

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Manuel Pégourié-Gonnard 2015-05-12 11:20:10 +02:00
parent 2088ba6d30
commit 43b37cbc92
13 changed files with 112 additions and 46 deletions
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3
ChangeLog
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@ -55,6 +55,9 @@ API Changes
available if POLARSSL_PEM_PARSE_C is defined (it never worked without).
* Test certificates in certs.c are no longer guaranteed to be nul-terminated
strings; use the new *_len variables instead of strlen().
* Functions mbedtls_x509_xxx_parse(), mbedtls_pk_parse_key(),
mbedtls_pk_parse_public_key() and mbedtls_dhm_parse_dhm() now expect the
length parameter to include the terminating null byte for PEM input.
* Signature of mpi_mul_mpi() changed to make the last argument unsigned
* Change SSL_DISABLE_RENEGOTIATION config.h flag to SSL_RENEGOTIATION
(support for renegotiation now needs explicit enabling in config.h).

3
include/mbedtls/dhm.h
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@ -269,11 +269,12 @@ void mbedtls_dhm_free( mbedtls_dhm_context *ctx );
#if defined(MBEDTLS_ASN1_PARSE_C)
/** \ingroup x509_module */
/**
* \brief Parse DHM parameters
* \brief Parse DHM parameters in PEM or DER format
*
* \param dhm DHM context to be initialized
* \param dhmin input buffer
* \param dhminlen size of the buffer
* (including the terminating null byte for PEM data)
*
* \return 0 if successful, or a specific DHM or PEM error code
*/

2
include/mbedtls/pem.h
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@ -73,7 +73,7 @@ void mbedtls_pem_init( mbedtls_pem_context *ctx );
* \param ctx context to use
* \param header header string to seek and expect
* \param footer footer string to seek and expect
* \param data source data to look in
* \param data source data to look in (must be nul-terminated)
* \param pwd password for decryption (can be NULL)
* \param pwdlen length of password
* \param use_len destination for total length used (set after header is

6
include/mbedtls/pk.h
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@ -427,11 +427,12 @@ mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx );
#if defined(MBEDTLS_PK_PARSE_C)
/** \ingroup pk_module */
/**
* \brief Parse a private key
* \brief Parse a private key in PEM or DER format
*
* \param ctx key to be initialized
* \param key input buffer
* \param keylen size of the buffer
* (including the terminating null byte for PEM data)
* \param pwd password for decryption (optional)
* \param pwdlen size of the password
*
@ -449,11 +450,12 @@ int mbedtls_pk_parse_key( mbedtls_pk_context *ctx,
/** \ingroup pk_module */
/**
* \brief Parse a public key
* \brief Parse a public key in PEM or DER format
*
* \param ctx key to be initialized
* \param key input buffer
* \param keylen size of the buffer
* (including the terminating null byte for PEM data)
*
* \note On entry, ctx must be empty, either freshly initialised
* with mbedtls_pk_init() or reset with mbedtls_pk_free(). If you need a

3
include/mbedtls/x509_crl.h
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@ -101,7 +101,7 @@ mbedtls_x509_crl;
*
* \param chain points to the start of the chain
* \param buf buffer holding the CRL data in DER format
* \param buflen size of the buffer
* (including the terminating null byte for PEM data)
*
* \return 0 if successful, or a specific X509 or PEM error code
*/
@ -115,6 +115,7 @@ int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain,
* \param chain points to the start of the chain
* \param buf buffer holding the CRL data in PEM or DER format
* \param buflen size of the buffer
* (including the terminating null byte for PEM data)
*
* \return 0 if successful, or a specific X509 or PEM error code
*/

3
include/mbedtls/x509_crt.h
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@ -141,8 +141,9 @@ int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *bu
* correctly, the first error is returned.
*
* \param chain points to the start of the chain
* \param buf buffer holding the certificate data
* \param buf buffer holding the certificate data in PEM or DER format
* \param buflen size of the buffer
* (including the terminating null byte for PEM data)
*
* \return 0 if all certificates parsed successfully, a positive number
* if partly successful or a specific X509 or PEM error code

1
include/mbedtls/x509_csr.h
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@ -99,6 +99,7 @@ int mbedtls_x509_csr_parse_der( mbedtls_x509_csr *csr,
* \param csr CSR context to fill
* \param buf buffer holding the CRL data
* \param buflen size of the buffer
* (including the terminating null byte for PEM data)
*
* \return 0 if successful, or a specific X509 or PEM error code
*/

23
library/dhm.c
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@ -421,10 +421,14 @@ int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,
mbedtls_pem_init( &pem );
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN DH PARAMETERS-----",
"-----END DH PARAMETERS-----",
dhmin, NULL, 0, &dhminlen );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( dhmin[dhminlen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN DH PARAMETERS-----",
"-----END DH PARAMETERS-----",
dhmin, NULL, 0, &dhminlen );
if( ret == 0 )
{
@ -503,6 +507,10 @@ exit:
#if defined(MBEDTLS_FS_IO)
/*
* Load all data from a file into a given buffer.
*
* The file is expected to contain either PEM or DER encoded data.
* A terminating null byte is always appended. It is included in the announced
* length only if the data looks like it is PEM encoded.
*/
static int load_file( const char *path, unsigned char **buf, size_t *n )
{
@ -540,6 +548,9 @@ static int load_file( const char *path, unsigned char **buf, size_t *n )
(*buf)[*n] = '\0';
if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
++*n;
return( 0 );
}
@ -557,7 +568,7 @@ int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path )
ret = mbedtls_dhm_parse_dhm( dhm, buf, n );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );
@ -584,7 +595,7 @@ int mbedtls_dhm_self_test( int verbose )
mbedtls_printf( " DHM parameter load: " );
if( ( ret = mbedtls_dhm_parse_dhm( &dhm, (const unsigned char *) mbedtls_test_dhm_params,
strlen( mbedtls_test_dhm_params ) ) ) != 0 )
mbedtls_test_dhm_params_len ) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );

73
library/pkparse.c
View File

@ -69,6 +69,10 @@ static void mbedtls_zeroize( void *v, size_t n ) {
/*
* Load all data from a file into a given buffer.
*
* The file is expected to contain either PEM or DER encoded data.
* A terminating null byte is always appended. It is included in the announced
* length only if the data looks like it is PEM encoded.
*/
int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
{
@ -106,6 +110,9 @@ int mbedtls_pk_load_file( const char *path, unsigned char **buf, size_t *n )
(*buf)[*n] = '\0';
if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
++*n;
return( 0 );
}
@ -128,7 +135,7 @@ int mbedtls_pk_parse_keyfile( mbedtls_pk_context *ctx,
ret = mbedtls_pk_parse_key( ctx, buf, n,
(const unsigned char *) pwd, strlen( pwd ) );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );
@ -148,7 +155,7 @@ int mbedtls_pk_parse_public_keyfile( mbedtls_pk_context *ctx, const char *path )
ret = mbedtls_pk_parse_public_key( ctx, buf, n );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );
@ -1064,10 +1071,15 @@ int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
mbedtls_pem_init( &pem );
#if defined(MBEDTLS_RSA_C)
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN RSA PRIVATE KEY-----",
"-----END RSA PRIVATE KEY-----",
key, pwd, pwdlen, &len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( key[keylen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN RSA PRIVATE KEY-----",
"-----END RSA PRIVATE KEY-----",
key, pwd, pwdlen, &len );
if( ret == 0 )
{
if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == NULL )
@ -1092,10 +1104,14 @@ int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN EC PRIVATE KEY-----",
"-----END EC PRIVATE KEY-----",
key, pwd, pwdlen, &len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( key[keylen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN EC PRIVATE KEY-----",
"-----END EC PRIVATE KEY-----",
key, pwd, pwdlen, &len );
if( ret == 0 )
{
if( ( pk_info = mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) ) == NULL )
@ -1119,10 +1135,14 @@ int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
return( ret );
#endif /* MBEDTLS_ECP_C */
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN PRIVATE KEY-----",
"-----END PRIVATE KEY-----",
key, NULL, 0, &len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( key[keylen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN PRIVATE KEY-----",
"-----END PRIVATE KEY-----",
key, NULL, 0, &len );
if( ret == 0 )
{
if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
@ -1138,10 +1158,14 @@ int mbedtls_pk_parse_key( mbedtls_pk_context *pk,
return( ret );
#if defined(MBEDTLS_PKCS12_C) || defined(MBEDTLS_PKCS5_C)
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN ENCRYPTED PRIVATE KEY-----",
"-----END ENCRYPTED PRIVATE KEY-----",
key, NULL, 0, &len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( key[keylen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN ENCRYPTED PRIVATE KEY-----",
"-----END ENCRYPTED PRIVATE KEY-----",
key, NULL, 0, &len );
if( ret == 0 )
{
if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
@ -1231,10 +1255,15 @@ int mbedtls_pk_parse_public_key( mbedtls_pk_context *ctx,
mbedtls_pem_context pem;
mbedtls_pem_init( &pem );
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN PUBLIC KEY-----",
"-----END PUBLIC KEY-----",
key, NULL, 0, &len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( key[keylen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN PUBLIC KEY-----",
"-----END PUBLIC KEY-----",
key, NULL, 0, &len );
if( ret == 0 )
{

4
library/x509.c
View File

@ -1008,7 +1008,7 @@ int mbedtls_x509_self_test( int verbose )
mbedtls_x509_crt_init( &clicert );
ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
strlen( mbedtls_test_cli_crt ) );
mbedtls_test_cli_crt_len );
if( ret != 0 )
{
if( verbose != 0 )
@ -1020,7 +1020,7 @@ int mbedtls_x509_self_test( int verbose )
mbedtls_x509_crt_init( &cacert );
ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_ca_crt,
strlen( mbedtls_test_ca_crt ) );
mbedtls_test_ca_crt_len );
if( ret != 0 )
{
if( verbose != 0 )

11
library/x509_crl.c
View File

@ -503,6 +503,11 @@ int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, s
do
{
mbedtls_pem_init( &pem );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( buf[buflen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN X509 CRL-----",
"-----END X509 CRL-----",
@ -532,7 +537,9 @@ int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, s
return( ret );
}
}
while( is_pem && buflen > 0 );
/* In the PEM case, buflen is 1 at the end, for the terminated NULL byte.
* And a valid CRL cannot be less than 1 byte anyway. */
while( is_pem && buflen > 1 );
if( is_pem )
return( 0 );
@ -556,7 +563,7 @@ int mbedtls_x509_crl_parse_file( mbedtls_x509_crl *chain, const char *path )
ret = mbedtls_x509_crl_parse( chain, buf, n );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );

11
library/x509_crt.c
View File

@ -852,8 +852,11 @@ int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, s
* one or more PEM certificates.
*/
#if defined(MBEDTLS_PEM_PARSE_C)
if( strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
if( buf[buflen - 1] == '\0' &&
strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
{
buf_format = MBEDTLS_X509_FORMAT_PEM;
}
#endif
if( buf_format == MBEDTLS_X509_FORMAT_DER )
@ -865,11 +868,13 @@ int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, s
int ret;
mbedtls_pem_context pem;
while( buflen > 0 )
/* 1 rather than 0 since the terminating NULL byte is counted in */
while( buflen > 1 )
{
size_t use_len;
mbedtls_pem_init( &pem );
/* If we get there, we know the string is null-terminated */
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN CERTIFICATE-----",
"-----END CERTIFICATE-----",
@ -953,7 +958,7 @@ int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
ret = mbedtls_x509_crt_parse( chain, buf, n );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );

15
library/x509_csr.c
View File

@ -274,10 +274,15 @@ int mbedtls_x509_csr_parse( mbedtls_x509_csr *csr, const unsigned char *buf, siz
#if defined(MBEDTLS_PEM_PARSE_C)
mbedtls_pem_init( &pem );
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN CERTIFICATE REQUEST-----",
"-----END CERTIFICATE REQUEST-----",
buf, NULL, 0, &use_len );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( buf[buflen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN CERTIFICATE REQUEST-----",
"-----END CERTIFICATE REQUEST-----",
buf, NULL, 0, &use_len );
if( ret == 0 )
{
@ -315,7 +320,7 @@ int mbedtls_x509_csr_parse_file( mbedtls_x509_csr *csr, const char *path )
ret = mbedtls_x509_csr_parse( csr, buf, n );
mbedtls_zeroize( buf, n + 1 );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );