mirror of
https://github.com/yuzu-emu/mbedtls.git
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Merge pull request #1360 from mazimkhan/cert-write-AndrzejKurek-opaque-keys-interfaces
Add support for using opaque keys in cert_write.c to sign a certificate
This commit is contained in:
Gilles Peskine
GitHub
commit
765ca4dcb5
@ -53,10 +53,14 @@ int main( void )
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/md.h"
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#include "mbedtls/error.h"
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#include "mbedtls/pk_info.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(_WIN32)
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#include <Windows.h>
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#endif
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#if defined(MBEDTLS_X509_CSR_PARSE_C)
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#define USAGE_CSR \
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@ -90,6 +94,8 @@ int main( void )
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#define DFL_CONSTRAINTS 1
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#define DFL_DIGEST MBEDTLS_MD_SHA256
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#define UNUSED(x) ((void)(x))
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#define USAGE \
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"\n usage: cert_write param=<>...\n" \
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"\n acceptable parameters:\n" \
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@ -179,6 +185,448 @@ struct options
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unsigned char ns_cert_type; /* NS cert type */
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} opt;
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#if defined(_WIN32)
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/** Below are the constants used for remote Opaque key implementation.
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*/
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/* Remote cryptoprocessor sync pattern. Sent to sync with the device before
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* sending commands. */
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#define REMOTE_KEY_MAGIC_PATTERN "rEmOtEkEy"
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#define REMOTE_KEY_CMD_TAG "//opaque_pk/ATCA"
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#define REMOTE_KEY_ID_MIN 0
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#define REMOTE_KEY_ID_MAX 7
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#define REMOTE_KEY_SERIAL_BAUD CBR_9600
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#define REMOTE_KEY_FUNC_GET_PUBKEY 0xA
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#define REMOTE_KEY_FUNC_SIGN 0xB
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int is_remote_key( const char *remote_info )
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{
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size_t tag_len = strlen( REMOTE_KEY_CMD_TAG );
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if ( strlen( remote_info ) > tag_len &&
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strncmp( remote_info, REMOTE_KEY_CMD_TAG, tag_len ) == 0 )
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return( 1 );
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return( 0 );
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}
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int parse_remote_info( const char *remote_info, int *key_idx, const char **serial_port )
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{
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size_t offset = 0;
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size_t remote_info_len = strlen( remote_info );
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if( !is_remote_key( remote_info ) )
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return( -1 );
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offset = strlen( REMOTE_KEY_CMD_TAG );
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offset++; // Skip the delimiter. FUTURE: Add validation.
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if( offset >= remote_info_len )
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return( -1 );
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*key_idx = (int) remote_info[offset++];
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offset++; // Skip the delimiter
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if( offset >= remote_info_len )
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return( -1 );
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*key_idx = *key_idx - 48; // ascii to decimal
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if ( *key_idx < REMOTE_KEY_ID_MIN || *key_idx > REMOTE_KEY_ID_MAX )
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{
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mbedtls_printf( " failed\n ! Invalid remote key index %d\n\n", *key_idx );
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return( -1 );
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}
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*serial_port = remote_info + offset;
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printf( "Got key id %d and com port %s\n", *key_idx, *serial_port );
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return( 0 );
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}
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/**
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* @brief Send a command to remote cryptoprocessor and receive response.
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*
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* It
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* - first sends a sync pattern 'rEmOtEkEy' and waits for an echo to sync
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* with the remote.
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* - Then it sends the tx buf supplied by the caller.
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* - It waits for a 4 byte length indicator. Value 0 means error.
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* - Finally it reads no. of bytes specified in received Length indicator
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* and fills received data in rx_buf and returns.
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* Note: success is considered when a length indicator > 0 is received and
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* data size == length indicator is successfully received.
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*
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*
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* @param serial_port Serial port to send & recv data.
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* @param tx_buf Command Tx buffer
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* @param tx_buf_len Tx buffer length
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* @param rx_buf Out response Rx buffer
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* @param rx_buf_len Rx buffer length
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* @param rx_len Received data length
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*
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* @retval 0 if success, or -1.
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*/
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int serial_xfer( const char * serial_port, const unsigned char * tx_buf,
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size_t tx_buf_len, unsigned char * rx_buf, size_t rx_buf_len,
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size_t * rx_len )
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{
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char c, comm_name[20]; /* \\\\.\\COMxy = 11 characters at least */
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HANDLE h_comm;
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DCB dcb_config;
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COMMTIMEOUTS comm_timeout;
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DWORD xfer_len;
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unsigned char len_buf[sizeof(size_t)];
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int ret = -1;
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size_t len = 0, sync_pattern_idx = 0;
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do
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{
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sprintf( comm_name, "\\\\.\\%s", serial_port );
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h_comm = CreateFile( comm_name, GENERIC_READ | GENERIC_WRITE, 0, 0,
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OPEN_EXISTING, 0, 0 );
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if ( h_comm == INVALID_HANDLE_VALUE )
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{
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mbedtls_printf( " failed\n ! failed to open port %s %lu\n\n", serial_port, GetLastError() );
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break;
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}
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if( GetCommState( h_comm, &dcb_config ) )
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{
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dcb_config.BaudRate = REMOTE_KEY_SERIAL_BAUD;
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dcb_config.Parity = NOPARITY;
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dcb_config.ByteSize = 8;
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dcb_config.StopBits = ONESTOPBIT;
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dcb_config.fOutxCtsFlow = FALSE; // No CTS output flow control
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dcb_config.fOutxDsrFlow = FALSE; // No DSR output flow control
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dcb_config.fDtrControl = DTR_CONTROL_DISABLE; // DTR flow control type
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dcb_config.fDsrSensitivity = FALSE; // DSR sensitivity
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dcb_config.fTXContinueOnXoff = TRUE; // XOFF continues Tx
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dcb_config.fOutX = FALSE; // No XON/XOFF out flow control
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dcb_config.fInX = FALSE; // No XON/XOFF in flow control
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dcb_config.fErrorChar = FALSE; // Disable error replacement
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dcb_config.fNull = FALSE; // Disable null stripping
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dcb_config.fRtsControl = RTS_CONTROL_DISABLE; // RTS flow control
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dcb_config.fAbortOnError = FALSE; // Do not abort reads/writes on error
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}
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else
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{
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mbedtls_printf( " failed\n ! GetCommState returned error %lu\n\n", GetLastError() );
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break;
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}
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if( !SetCommState( h_comm, &dcb_config ) )
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{
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mbedtls_printf( " failed\n ! SetCommState returned error %lu\n\n", GetLastError() );
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break;
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}
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if( GetCommTimeouts( h_comm, &comm_timeout ) )
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{
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comm_timeout.ReadIntervalTimeout = 1000;
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comm_timeout.ReadTotalTimeoutMultiplier = 10;
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comm_timeout.ReadTotalTimeoutConstant = 1000;
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comm_timeout.WriteTotalTimeoutConstant = 1000;
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comm_timeout.WriteTotalTimeoutMultiplier = 10;
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}
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else
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{
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mbedtls_printf( " failed\n ! GetCommTimeouts returned error %lu\n\n", GetLastError() );
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break;
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}
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if( !SetCommTimeouts( h_comm, &comm_timeout ) )
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{
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mbedtls_printf( " failed\n ! SetCommTimeouts returned error %lu\n\n", GetLastError() );
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break;
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}
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/* Flush data on serial before sending sync pattern */
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while( ReadFile( h_comm, &c, sizeof(c), &xfer_len, NULL ) && xfer_len != 0 );
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/* Sync with peer */
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if( !WriteFile( h_comm, REMOTE_KEY_MAGIC_PATTERN, (DWORD)strlen(REMOTE_KEY_MAGIC_PATTERN),
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&xfer_len, NULL ) )
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{
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mbedtls_printf( " failed\n ! WriteFile returned error %lu\n\n", GetLastError() );
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break;
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}
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while( sync_pattern_idx != strlen(REMOTE_KEY_MAGIC_PATTERN) )
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{
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if( !ReadFile( h_comm, &c, sizeof(c), &xfer_len, NULL ) )
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{
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mbedtls_printf( " failed\n ! ReadFile returned error %lu\n\n", GetLastError() );
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break;
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}
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if ( c == REMOTE_KEY_MAGIC_PATTERN[sync_pattern_idx] )
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sync_pattern_idx++;
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else
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sync_pattern_idx = 0;
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}
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/* Exit if there was a read error */
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if ( sync_pattern_idx != strlen(REMOTE_KEY_MAGIC_PATTERN) )
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{
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mbedtls_printf("Failed to sync!\n");
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break;
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}
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{
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size_t i;
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printf("Tx: ");
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for (i = 0; i < tx_buf_len; i++)
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printf ("0x%02x ", (tx_buf)[i]);
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printf("\n");
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}
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if( !WriteFile( h_comm, tx_buf, (DWORD)tx_buf_len,
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&xfer_len, NULL ) )
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{
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mbedtls_printf( " failed\n ! WriteFile returned error %lu\n\n", GetLastError() );
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break;
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}
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/* Read LI (length indicator) */
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if( !ReadFile( h_comm, len_buf, sizeof(len_buf), &xfer_len, NULL ) ) /* Serial error */
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{
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mbedtls_printf( " failed\n ! ReadFile returned error %lu\n\n", GetLastError() );
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break;
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}
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*rx_len = ( len_buf[0] << 24 ) | ( len_buf[1] << 16 ) | ( len_buf[2] << 8 ) | len_buf[3];
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if ( *rx_len == 0 ) /* LI == 0 indicates remote error */
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{
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mbedtls_printf( " failed\n ! Received length indicator == 0\n\n" );
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break;
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}
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if ( *rx_len > rx_buf_len ) /* Buffer too small */
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{
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mbedtls_printf( " failed\n ! Buffer too small to hold received data\n\n" );
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break;
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}
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/* Read payload */
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len = 0;
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while( len < *rx_len )
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{
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if( !ReadFile( h_comm, rx_buf + len, (DWORD)(*rx_len - len), &xfer_len, NULL ) )
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{
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mbedtls_printf( " failed\n ! ReadFile returned error %lu\n\n", GetLastError() );
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break;
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}
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len += xfer_len;
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}
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if( len < *rx_len ) /* Serial error */
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{
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mbedtls_printf( " failed\n ! ReadFile returned error %lu\n\n", GetLastError() );
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break;
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}
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printf("Received LI 0x%02x 0x%02x 0x%02x 0x%02x \n", len_buf[0], len_buf[1], len_buf[2], len_buf[3]);
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{
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size_t i;
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printf("Rx: ");
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for (i = 0; i < *rx_len; i++)
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printf ("0x%02x ", (rx_buf)[i]);
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printf("\n");
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}
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ret = 0;
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} while( 0 );
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if( h_comm != INVALID_HANDLE_VALUE )
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{
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CloseHandle( h_comm );
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h_comm = INVALID_HANDLE_VALUE;
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}
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return( ret );
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}
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/** Load a transparent public key context with public key from remote device
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* over serial.
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* This function sends:
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* rEmOtEkEy<char encoded function code=GetPubKey><char encoded private key ID>
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* Receives:
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* <4 bytes length indicator in network order><concatenated public key>
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*/
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int load_pubkey_from_remote( const char * remote_info, mbedtls_pk_context * ctx )
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{
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int key_idx = 0, offset = 0, ret = 0;
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const char * serial_port = NULL;
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unsigned char func_buffer[2]; /* Op code: 1 + key Id: 1 */
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unsigned char pub_key_buf[65]; /* ECDSA Pub key: 64 + EC octet string format tag: 1 */
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size_t rx_len = 0;
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static mbedtls_ecp_keypair ecp_key;
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if( parse_remote_info( remote_info, &key_idx, &serial_port ) != 0 )
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return( -1 );
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/* Prepare command */
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offset = 0;
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func_buffer[offset++] = REMOTE_KEY_FUNC_GET_PUBKEY;
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func_buffer[offset++] = key_idx;
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if( serial_xfer( serial_port, func_buffer, offset, pub_key_buf,
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sizeof( pub_key_buf ), &rx_len ) != 0 )
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{
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mbedtls_printf( " failed\n ! Serial error trying to get pulic key\n\n" );
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return( -1 );
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}
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/* Import public key from received binary */
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mbedtls_ecp_keypair_init(&ecp_key);
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ret = mbedtls_ecp_group_load(&ecp_key.grp, MBEDTLS_ECP_DP_SECP256R1);
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if( ret != 0 )
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{
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mbedtls_printf( " failed\n ! Failed to load ecp group\n\n" );
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return( ret );
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}
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ret = mbedtls_ecp_point_read_binary(&ecp_key.grp, &ecp_key.Q, pub_key_buf, rx_len );
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if( ret != 0 )
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{
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mbedtls_printf( " failed\n ! Failed to read ecp key from binary\n\n" );
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return( ret );
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}
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mbedtls_pk_setup( ctx, mbedtls_pk_info_from_type( MBEDTLS_PK_ECKEY ) );
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ctx->pk_ctx = &ecp_key;
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return( 0 );
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}
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/**
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* @brief Tell if the context can do the operation given by type
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*
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* @param ctx PK Context
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* @param type Target type
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*
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* @return 0 if context can't do the operations,
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* 1 otherwise.
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*/
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static int remote_can_do_func(const void *ctx, mbedtls_pk_type_t type)
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{
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UNUSED(ctx);
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/* At the moment only ECDSA is supported */
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return (MBEDTLS_PK_ECDSA == type);
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}
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typedef struct
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{
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const char *serial_port;
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unsigned char key_idx;
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} remote_serial_pk_context;
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/**
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* @brief Sign using remote cryptoprocessor accessed over serial.
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*
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* @param ctx ECDSA context
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* @param md_alg Hash Algorithm that was used to hash the message.
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* Only SHA256 is supported.
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* @param hash Message hash
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* @param hash_len Length of hash
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* @param sig Buffer that will hold the signature
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* @param sig_len Length of the signature written
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* @param f_rng RNG function
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* @param p_rng RNG parameter
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*
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* @retval 0 if successful, or 1.
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*/
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static int remote_sign_func(void *ctx, mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hash_len,
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unsigned char *sig, size_t *sig_len,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng)
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{
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remote_serial_pk_context * remote_ctx = (remote_serial_pk_context *)ctx;
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/* Required buffer = func 1 byte + key Id 1 byte + hash len 4 bytes + hash */
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unsigned char func_buffer[MBEDTLS_MD_MAX_SIZE + 4 + 1 + 1];
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size_t offset = 0;
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UNUSED( f_rng );
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UNUSED( p_rng );
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/* Currently this feature only supports Crypto chip ATCAECC508A that only
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* supports SHA256. */
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if( md_alg != MBEDTLS_MD_SHA256 )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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if( hash_len + 4 + 1 + 1 > sizeof( func_buffer ) )
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{
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return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
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}
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func_buffer[offset++] = REMOTE_KEY_FUNC_SIGN;
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func_buffer[offset++] = remote_ctx->key_idx;
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func_buffer[offset++] = (unsigned char)(hash_len >> 24);
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func_buffer[offset++] = (unsigned char)(hash_len >> 16);
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func_buffer[offset++] = (unsigned char)(hash_len >> 8);
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func_buffer[offset++] = (unsigned char)(hash_len);
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memcpy( func_buffer + offset, hash, hash_len );
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offset += hash_len;
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if( serial_xfer( remote_ctx->serial_port, func_buffer, offset, sig,
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MBEDTLS_ECDSA_MAX_SIG_LEN(256), sig_len ) != 0 )
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{
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mbedtls_printf( " failed\n ! Serial error in signing\n\n" );
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return( -1 );
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}
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return( 0 );
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}
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void remote_free( void *ctx )
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{
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/* Nothing to free since remote context is statically allocated.
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* Within this app there is no need to scrub the memory.
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*/
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UNUSED( ctx );
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}
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int mbedtls_pk_remote_setup( mbedtls_pk_context * ctx, const char * serial_port,
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unsigned char key_idx )
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{
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/* allocate remote serial context */
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static remote_serial_pk_context remote;
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/* Opaque private key */
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static const mbedtls_pk_info_t remote_pk_info =
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MBEDTLS_PK_OPAQUE_INFO_1(
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"RemoteSerial",
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NULL,
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remote_can_do_func,
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NULL,
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NULL,
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remote_sign_func,
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NULL,
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NULL,
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NULL,
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NULL,
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remote_free,
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NULL
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);
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if ( ctx == NULL )
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return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
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remote.serial_port = serial_port;
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remote.key_idx = key_idx;
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mbedtls_pk_setup( ctx, &remote_pk_info );
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ctx->pk_ctx = (void *)&remote;
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return( 0 );
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}
|
||||
|
||||
int setup_opaque_privkey( const char * remote_info, mbedtls_pk_context * ctx )
|
||||
{
|
||||
int key_idx = 0, ret = 0;
|
||||
const char * serial_port = NULL;
|
||||
|
||||
if( parse_remote_info( remote_info, &key_idx, &serial_port ) != 0 )
|
||||
return( -1 );
|
||||
|
||||
ret = mbedtls_pk_remote_setup( ctx, serial_port, key_idx );
|
||||
if( ret != 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! remote pk setup failure \n\n" );
|
||||
return( ret );
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
#endif /* _WIN32 */
|
||||
|
||||
int write_certificate( mbedtls_x509write_cert *crt, const char *output_file,
|
||||
int (*f_rng)(void *, unsigned char *, size_t),
|
||||
void *p_rng )
|
||||
@ -577,14 +1025,25 @@ int main( int argc, char *argv[] )
|
||||
mbedtls_printf( " . Loading the subject key ..." );
|
||||
fflush( stdout );
|
||||
|
||||
ret = mbedtls_pk_parse_keyfile( &loaded_subject_key, opt.subject_key,
|
||||
opt.subject_pwd );
|
||||
if( ret != 0 )
|
||||
#if defined(_WIN32)
|
||||
if ( is_remote_key( opt.subject_key ) )
|
||||
{
|
||||
mbedtls_strerror( ret, buf, 1024 );
|
||||
mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile "
|
||||
"returned -0x%04x - %s\n\n", -ret, buf );
|
||||
goto exit;
|
||||
ret = load_pubkey_from_remote( opt.subject_key, &loaded_subject_key );
|
||||
if ( ret != 0 )
|
||||
goto exit;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
{
|
||||
ret = mbedtls_pk_parse_keyfile( &loaded_subject_key, opt.subject_key,
|
||||
opt.subject_pwd );
|
||||
if( ret != 0 )
|
||||
{
|
||||
mbedtls_strerror( ret, buf, 1024 );
|
||||
mbedtls_printf( " failed\n ! mbedtls_pk_parse_keyfile "
|
||||
"returned -0x%04x - %s\n\n", -ret, buf );
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
|
||||
mbedtls_printf( " ok\n" );
|
||||
@ -593,8 +1052,20 @@ int main( int argc, char *argv[] )
|
||||
mbedtls_printf( " . Loading the issuer key ..." );
|
||||
fflush( stdout );
|
||||
|
||||
ret = mbedtls_pk_parse_keyfile( &loaded_issuer_key, opt.issuer_key,
|
||||
opt.issuer_pwd );
|
||||
#if defined(_WIN32)
|
||||
if ( is_remote_key( opt.issuer_key ) )
|
||||
{
|
||||
ret = setup_opaque_privkey( opt.issuer_key, &loaded_issuer_key );
|
||||
if ( ret != 0 )
|
||||
goto exit;
|
||||
}
|
||||
else
|
||||
#endif
|
||||
{
|
||||
ret = mbedtls_pk_parse_keyfile( &loaded_issuer_key, opt.issuer_key,
|
||||
opt.issuer_pwd );
|
||||
}
|
||||
|
||||
if( ret != 0 )
|
||||
{
|
||||
mbedtls_strerror( ret, buf, 1024 );
|
||||
@ -803,6 +1274,7 @@ exit:
|
||||
|
||||
return( ret );
|
||||
}
|
||||
|
||||
#endif /* MBEDTLS_X509_CRT_WRITE_C && MBEDTLS_X509_CRT_PARSE_C &&
|
||||
MBEDTLS_FS_IO && MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C &&
|
||||
MBEDTLS_ERROR_C && MBEDTLS_PEM_WRITE_C */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user