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- Added option to add minimum accepted SSL/TLS protocol version

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This commit is contained in:
Paul Bakker 2012-09-28 13:28:45 +00:00
parent 5d19f86fdd
commit 1d29fb5e33
8 changed files with 142 additions and 1 deletions
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1
ChangeLog
View file

@ -28,6 +28,7 @@ Features
* Added predefined DHM groups from RFC 5114
* Added simple SSL session cache implementation
* Added ServerName extension parsing (SNI) at server side
* Added option to add minimum accepted SSL/TLS protocol version
Changes
* Removed redundant POLARSSL_DEBUG_MSG define

16
include/polarssl/ssl.h
View file

@ -90,6 +90,7 @@
#define POLARSSL_ERR_SSL_HW_ACCEL_FAILED -0x7F80 /**< Hardware acceleration function returned with error */
#define POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH -0x6F80 /**< Hardware acceleration function skipped / left alone data */
#define POLARSSL_ERR_SSL_COMPRESSION_FAILED -0x6F00 /**< Processing of the compression / decompression failed */
#define POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION -0x6E80 /**< Handshake protocol not within min/max boundaries */
/*
* Various constants
@ -389,6 +390,8 @@ struct _ssl_context
int max_major_ver; /*!< max. major version from client */
int max_minor_ver; /*!< max. minor version from client */
int min_minor_ver; /*!< min. major version accepted */
int min_major_ver; /*!< min. minor version accepted */
/*
* Callbacks (RNG, debug, I/O, verification)
@ -828,6 +831,19 @@ void ssl_set_sni( ssl_context *ssl,
*/
void ssl_set_max_version( ssl_context *ssl, int major, int minor );
/**
* \brief Set the minimum accepted SSL/TLS protocol version
* (Default: SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0)
*
* \param ssl SSL context
* \param major Major version number (only SSL_MAJOR_VERSION_3 supported)
* \param minor Minor version number (SSL_MINOR_VERSION_0,
* SSL_MINOR_VERSION_1 and SSL_MINOR_VERSION_2,
* SSL_MINOR_VERSION_3 supported)
*/
void ssl_set_min_version( ssl_context *ssl, int major, int minor );
/**
* \brief Enable / Disable renegotiation support for connection
* (Default: SSL_RENEGOTIATION_ENABLED)

2
library/error.c
View file

@ -303,6 +303,8 @@ void error_strerror( int ret, char *buf, size_t buflen )
snprintf( buf, buflen, "SSL - Hardware acceleration function skipped / left alone data" );
if( use_ret == -(POLARSSL_ERR_SSL_COMPRESSION_FAILED) )
snprintf( buf, buflen, "SSL - Processing of the compression / decompression failed" );
if( use_ret == -(POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION) )
snprintf( buf, buflen, "SSL - Handshake protocol not within min/max boundaries" );
#endif /* POLARSSL_SSL_TLS_C */
#if defined(POLARSSL_X509_PARSE_C)

12
library/ssl_cli.c
View file

@ -413,6 +413,18 @@ static int ssl_parse_server_hello( ssl_context *ssl )
ssl->minor_ver = buf[5];
if( ssl->minor_ver < ssl->min_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "server only supports ssl smaller than minimum"
" [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver,
buf[4], buf[5] ) );
ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL,
SSL_ALERT_MSG_PROTOCOL_VERSION );
return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
}
#if defined(POLARSSL_DEBUG_C)
t = ( (time_t) buf[6] << 24 )
| ( (time_t) buf[7] << 16 )

12
library/ssl_srv.c
View file

@ -222,6 +222,18 @@ static int ssl_parse_client_hello( ssl_context *ssl )
ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_3 )
? buf[5] : SSL_MINOR_VERSION_3;
if( ssl->minor_ver < ssl->min_minor_ver )
{
SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
" [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver,
buf[4], buf[5] ) );
ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL,
SSL_ALERT_MSG_PROTOCOL_VERSION );
return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
}
ssl->max_major_ver = buf[4];
ssl->max_minor_ver = buf[5];

9
library/ssl_tls.c
View file

@ -2855,6 +2855,9 @@ int ssl_init( ssl_context *ssl )
ssl->rsa_sign = ssl_rsa_sign;
ssl->rsa_key_len = ssl_rsa_key_len;
ssl->min_major_ver = SSL_MAJOR_VERSION_3;
ssl->min_minor_ver = SSL_MINOR_VERSION_0;
#if defined(POLARSSL_DHM_C)
if( ( ret = mpi_read_string( &ssl->dhm_P, 16,
POLARSSL_DHM_RFC5114_MODP_1024_P) ) != 0 ||
@ -3133,6 +3136,12 @@ void ssl_set_max_version( ssl_context *ssl, int major, int minor )
ssl->max_minor_ver = minor;
}
void ssl_set_min_version( ssl_context *ssl, int major, int minor )
{
ssl->min_major_ver = major;
ssl->min_minor_ver = minor;
}
void ssl_set_renegotiation( ssl_context *ssl, int renegotiation )
{
ssl->disable_renegotiation = renegotiation;

68
programs/ssl/ssl_client2.c
View file

@ -52,6 +52,8 @@
#define DFL_FORCE_CIPHER 0
#define DFL_RENEGOTIATION SSL_RENEGOTIATION_ENABLED
#define DFL_ALLOW_LEGACY SSL_LEGACY_NO_RENEGOTIATION
#define DFL_MIN_VERSION -1
#define DFL_MAX_VERSION -1
#define GET_REQUEST "GET %s HTTP/1.0\r\n\r\n"
@ -71,6 +73,8 @@ struct options
int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
int renegotiation; /* enable / disable renegotiation */
int allow_legacy; /* allow legacy renegotiation */
int min_version; /* minimum protocol version accepted */
int max_version; /* maximum protocol version accepted */
} opt;
void my_debug( void *ctx, int level, const char *str )
@ -142,6 +146,12 @@ int my_verify( void *data, x509_cert *crt, int depth, int *flags )
" request_page=%%s default: \".\"\n" \
" renegotiation=%%d default: 1 (enabled)\n" \
" allow_legacy=%%d default: 0 (disabled)\n" \
"\n" \
" min_version=%%s default: \"\" (ssl3)\n" \
" max_version=%%s default: \"\" (tls1_2)\n" \
" force_version=%%s default: \"\" (none)\n" \
" options: ssl3, tls1, tls1_1, tls1_2\n" \
"\n" \
" force_ciphersuite=<name> default: all enabled\n"\
" acceptable ciphersuite names:\n"
@ -215,6 +225,8 @@ int main( int argc, char *argv[] )
opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
opt.renegotiation = DFL_RENEGOTIATION;
opt.allow_legacy = DFL_ALLOW_LEGACY;
opt.min_version = DFL_MIN_VERSION;
opt.max_version = DFL_MAX_VERSION;
for( i = 1; i < argc; i++ )
{
@ -271,6 +283,57 @@ int main( int argc, char *argv[] )
if( opt.allow_legacy < 0 || opt.allow_legacy > 1 )
goto usage;
}
else if( strcmp( p, "min_version" ) == 0 )
{
if( strcmp( q, "ssl3" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_0;
else if( strcmp( q, "tls1" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_1;
else if( strcmp( q, "tls1_1" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_2;
else if( strcmp( q, "tls1_2" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_3;
else
goto usage;
}
else if( strcmp( p, "max_version" ) == 0 )
{
if( strcmp( q, "ssl3" ) == 0 )
opt.max_version = SSL_MINOR_VERSION_0;
else if( strcmp( q, "tls1" ) == 0 )
opt.max_version = SSL_MINOR_VERSION_1;
else if( strcmp( q, "tls1_1" ) == 0 )
opt.max_version = SSL_MINOR_VERSION_2;
else if( strcmp( q, "tls1_2" ) == 0 )
opt.max_version = SSL_MINOR_VERSION_3;
else
goto usage;
}
else if( strcmp( p, "force_version" ) == 0 )
{
if( strcmp( q, "ssl3" ) == 0 )
{
opt.min_version = SSL_MINOR_VERSION_0;
opt.max_version = SSL_MINOR_VERSION_0;
}
else if( strcmp( q, "tls1" ) == 0 )
{
opt.min_version = SSL_MINOR_VERSION_1;
opt.max_version = SSL_MINOR_VERSION_1;
}
else if( strcmp( q, "tls1_1" ) == 0 )
{
opt.min_version = SSL_MINOR_VERSION_2;
opt.max_version = SSL_MINOR_VERSION_2;
}
else if( strcmp( q, "tls1_2" ) == 0 )
{
opt.min_version = SSL_MINOR_VERSION_3;
opt.max_version = SSL_MINOR_VERSION_3;
}
else
goto usage;
}
else
goto usage;
}
@ -425,6 +488,11 @@ int main( int argc, char *argv[] )
ssl_set_hostname( &ssl, opt.server_name );
if( opt.min_version != -1 )
ssl_set_min_version( &ssl, SSL_MAJOR_VERSION_3, opt.min_version );
if( opt.max_version != -1 )
ssl_set_max_version( &ssl, SSL_MAJOR_VERSION_3, opt.max_version );
/*
* 4. Handshake
*/

23
programs/ssl/ssl_server2.c
View file

@ -59,6 +59,7 @@
#define DFL_FORCE_CIPHER 0
#define DFL_RENEGOTIATION SSL_RENEGOTIATION_ENABLED
#define DFL_ALLOW_LEGACY SSL_LEGACY_NO_RENEGOTIATION
#define DFL_MIN_VERSION -1
#define HTTP_RESPONSE \
"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
@ -79,6 +80,7 @@ struct options
int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
int renegotiation; /* enable / disable renegotiation */
int allow_legacy; /* allow legacy renegotiation */
int min_version; /* minimum protocol version accepted */
} opt;
void my_debug( void *ctx, int level, const char *str )
@ -110,6 +112,8 @@ void my_debug( void *ctx, int level, const char *str )
" request_page=%%s default: \".\"\n" \
" renegotiation=%%d default: 1 (enabled)\n" \
" allow_legacy=%%d default: 0 (disabled)\n" \
" min_version=%%s default: \"ssl3\"\n" \
" options: ssl3, tls1, tls1_1, tls1_2\n" \
" force_ciphersuite=<name> default: all enabled\n"\
" acceptable ciphersuite names:\n"
@ -189,6 +193,7 @@ int main( int argc, char *argv[] )
opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
opt.renegotiation = DFL_RENEGOTIATION;
opt.allow_legacy = DFL_ALLOW_LEGACY;
opt.min_version = DFL_MIN_VERSION;
for( i = 1; i < argc; i++ )
{
@ -241,6 +246,19 @@ int main( int argc, char *argv[] )
if( opt.allow_legacy < 0 || opt.allow_legacy > 1 )
goto usage;
}
else if( strcmp( p, "min_version" ) == 0 )
{
if( strcmp( q, "ssl3" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_0;
else if( strcmp( q, "tls1" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_1;
else if( strcmp( q, "tls1_1" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_2;
else if( strcmp( q, "tls1_2" ) == 0 )
opt.min_version = SSL_MINOR_VERSION_3;
else
goto usage;
}
else
goto usage;
}
@ -395,6 +413,9 @@ int main( int argc, char *argv[] )
POLARSSL_DHM_RFC5114_MODP_2048_G );
#endif
if( opt.min_version != -1 )
ssl_set_min_version( &ssl, SSL_MAJOR_VERSION_3, opt.min_version );
printf( " ok\n" );
reset:
@ -464,7 +485,7 @@ reset:
if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
{
printf( " failed\n ! ssl_handshake returned -0x%x\n\n", -ret );
goto exit;
goto reset;
}
}