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Fix for pkcs12 with NULL or zero length password

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Previously passing a NULL or zero length password into either
mbedtls_pkcs12_pbe() or mbedtls_pkcs12_derive() could cause an infinate
loop, and it was also possible to pass a NULL password, with a non-zero
length, which would cause memory corruption.
I have fixed these errors, and improved the documentation to reflect the
changes and further explain what is expected of the inputs.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott
2021-11-11 19:00:38 +00:00
parent 18a59b7d4c
commit fe724fe618
3 changed files with 31 additions and 14 deletions
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21
library/pkcs12.c
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@ -179,6 +179,9 @@ int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
mbedtls_cipher_context_t cipher_ctx;
size_t olen = 0;
if( pwd == NULL && pwdlen != 0 )
return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
cipher_info = mbedtls_cipher_info_from_type( cipher_type );
if( cipher_info == NULL )
return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
@ -231,13 +234,18 @@ static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
unsigned char *p = data;
size_t use_len;
while( data_len > 0 )
if( filler != NULL && fill_len != 0 )
{
use_len = ( data_len > fill_len ) ? fill_len : data_len;
memcpy( p, filler, use_len );
p += use_len;
data_len -= use_len;
while( data_len > 0 )
{
use_len = ( data_len > fill_len ) ? fill_len : data_len;
memcpy( p, filler, use_len );
p += use_len;
data_len -= use_len;
}
}
else
memset( data, 0, data_len );
}
int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
@ -263,6 +271,9 @@ int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
if( pwd == NULL && pwdlen != 0 )
return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
md_info = mbedtls_md_info_from_type( md_type );
if( md_info == NULL )
return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );