diff options
Diffstat (limited to 'polarssl/src/library/ssl_srv.c')
| -rw-r--r-- | polarssl/src/library/ssl_srv.c | 1080 |
1 files changed, 1080 insertions, 0 deletions
diff --git a/polarssl/src/library/ssl_srv.c b/polarssl/src/library/ssl_srv.c new file mode 100644 index 0000000..ecf1536 --- /dev/null +++ b/polarssl/src/library/ssl_srv.c @@ -0,0 +1,1080 @@ +/* + * SSLv3/TLSv1 server-side functions + * + * Copyright (C) 2006-2012, Brainspark B.V. + * + * This file is part of PolarSSL (http://www.polarssl.org) + * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "polarssl/config.h" + +#if defined(POLARSSL_SSL_SRV_C) + +#include "polarssl/debug.h" +#include "polarssl/ssl.h" + +#if defined(POLARSSL_PKCS11_C) +#include "polarssl/pkcs11.h" +#endif /* defined(POLARSSL_PKCS11_C) */ + +#include <stdlib.h> +#include <stdio.h> +#include <time.h> + +static int ssl_parse_client_hello( ssl_context *ssl ) +{ + int ret; + unsigned int i, j; + size_t n; + unsigned int ciph_len, sess_len; + unsigned int chal_len, comp_len; + unsigned char *buf, *p; + + SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); + + if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); + return( ret ); + } + + buf = ssl->in_hdr; + + if( ( buf[0] & 0x80 ) != 0 ) + { + SSL_DEBUG_BUF( 4, "record header", buf, 5 ); + + SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", + buf[2] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", + ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", + buf[3], buf[4] ) ); + + /* + * SSLv2 Client Hello + * + * Record layer: + * 0 . 1 message length + * + * SSL layer: + * 2 . 2 message type + * 3 . 4 protocol version + */ + if( buf[2] != SSL_HS_CLIENT_HELLO || + buf[3] != SSL_MAJOR_VERSION_3 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; + + if( n < 17 || n > 512 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ssl->max_major_ver = buf[3]; + ssl->max_minor_ver = buf[4]; + + ssl->major_ver = SSL_MAJOR_VERSION_3; + ssl->minor_ver = ( buf[4] <= SSL_MINOR_VERSION_3 ) + ? buf[4] : SSL_MINOR_VERSION_3; + + if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); + return( ret ); + } + + ssl->update_checksum( ssl, buf + 2, n ); + + buf = ssl->in_msg; + n = ssl->in_left - 5; + + /* + * 0 . 1 ciphersuitelist length + * 2 . 3 session id length + * 4 . 5 challenge length + * 6 . .. ciphersuitelist + * .. . .. session id + * .. . .. challenge + */ + SSL_DEBUG_BUF( 4, "record contents", buf, n ); + + ciph_len = ( buf[0] << 8 ) | buf[1]; + sess_len = ( buf[2] << 8 ) | buf[3]; + chal_len = ( buf[4] << 8 ) | buf[5]; + + SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d", + ciph_len, sess_len, chal_len ) ); + + /* + * Make sure each parameter length is valid + */ + if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( sess_len > 32 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( chal_len < 8 || chal_len > 32 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( n != 6 + ciph_len + sess_len + chal_len ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", + buf + 6, ciph_len ); + SSL_DEBUG_BUF( 3, "client hello, session id", + buf + 6 + ciph_len, sess_len ); + SSL_DEBUG_BUF( 3, "client hello, challenge", + buf + 6 + ciph_len + sess_len, chal_len ); + + p = buf + 6 + ciph_len; + ssl->session->length = sess_len; + memset( ssl->session->id, 0, sizeof( ssl->session->id ) ); + memcpy( ssl->session->id, p, ssl->session->length ); + + p += sess_len; + memset( ssl->randbytes, 0, 64 ); + memcpy( ssl->randbytes + 32 - chal_len, p, chal_len ); + + for( i = 0; ssl->ciphersuites[i] != 0; i++ ) + { + for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) + { + if( p[0] == 0 && + p[1] == 0 && + p[2] == ssl->ciphersuites[i] ) + goto have_ciphersuite; + } + } + } + else + { + SSL_DEBUG_BUF( 4, "record header", buf, 5 ); + + SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d", + buf[0] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d", + ( buf[3] << 8 ) | buf[4] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v3, protocol ver: [%d:%d]", + buf[1], buf[2] ) ); + + /* + * SSLv3 Client Hello + * + * Record layer: + * 0 . 0 message type + * 1 . 2 protocol version + * 3 . 4 message length + */ + if( buf[0] != SSL_MSG_HANDSHAKE || + buf[1] != SSL_MAJOR_VERSION_3 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + n = ( buf[3] << 8 ) | buf[4]; + + if( n < 45 || n > 512 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( ( ret = ssl_fetch_input( ssl, 5 + n ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); + return( ret ); + } + + buf = ssl->in_msg; + n = ssl->in_left - 5; + + ssl->update_checksum( ssl, buf, n ); + + /* + * SSL layer: + * 0 . 0 handshake type + * 1 . 3 handshake length + * 4 . 5 protocol version + * 6 . 9 UNIX time() + * 10 . 37 random bytes + * 38 . 38 session id length + * 39 . 38+x session id + * 39+x . 40+x ciphersuitelist length + * 41+x . .. ciphersuitelist + * .. . .. compression alg. + * .. . .. extensions + */ + SSL_DEBUG_BUF( 4, "record contents", buf, n ); + + SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", + buf[0] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d", + ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) ); + SSL_DEBUG_MSG( 3, ( "client hello v3, max. version: [%d:%d]", + buf[4], buf[5] ) ); + + /* + * Check the handshake type and protocol version + */ + if( buf[0] != SSL_HS_CLIENT_HELLO || + buf[4] != SSL_MAJOR_VERSION_3 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ssl->major_ver = SSL_MAJOR_VERSION_3; + ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_3 ) + ? buf[5] : SSL_MINOR_VERSION_3; + + ssl->max_major_ver = buf[4]; + ssl->max_minor_ver = buf[5]; + + memcpy( ssl->randbytes, buf + 6, 32 ); + + /* + * Check the handshake message length + */ + if( buf[1] != 0 || n != (unsigned int) 4 + ( ( buf[2] << 8 ) | buf[3] ) ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + /* + * Check the session length + */ + sess_len = buf[38]; + + if( sess_len > 32 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ssl->session->length = sess_len; + memset( ssl->session->id, 0, sizeof( ssl->session->id ) ); + memcpy( ssl->session->id, buf + 39 , ssl->session->length ); + + /* + * Check the ciphersuitelist length + */ + ciph_len = ( buf[39 + sess_len] << 8 ) + | ( buf[40 + sess_len] ); + + if( ciph_len < 2 || ciph_len > 256 || ( ciph_len % 2 ) != 0 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + /* + * Check the compression algorithms length + */ + comp_len = buf[41 + sess_len + ciph_len]; + + if( comp_len < 1 || comp_len > 16 ) + { + SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + SSL_DEBUG_BUF( 3, "client hello, random bytes", + buf + 6, 32 ); + SSL_DEBUG_BUF( 3, "client hello, session id", + buf + 38, sess_len ); + SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", + buf + 41 + sess_len, ciph_len ); + SSL_DEBUG_BUF( 3, "client hello, compression", + buf + 42 + sess_len + ciph_len, comp_len ); + + /* + * Search for a matching ciphersuite + */ + for( i = 0; ssl->ciphersuites[i] != 0; i++ ) + { + for( j = 0, p = buf + 41 + sess_len; j < ciph_len; + j += 2, p += 2 ) + { + if( p[0] == 0 && p[1] == ssl->ciphersuites[i] ) + goto have_ciphersuite; + } + } + } + + SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); + + return( POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN ); + +have_ciphersuite: + + ssl->session->ciphersuite = ssl->ciphersuites[i]; + ssl_kickstart_checksum( ssl, ssl->session->ciphersuite, buf, n ); + + ssl->in_left = 0; + ssl->state++; + + SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); + + return( 0 ); +} + +static int ssl_write_server_hello( ssl_context *ssl ) +{ + time_t t; + int ret, n; + unsigned char *buf, *p; + + SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); + + /* + * 0 . 0 handshake type + * 1 . 3 handshake length + * 4 . 5 protocol version + * 6 . 9 UNIX time() + * 10 . 37 random bytes + */ + buf = ssl->out_msg; + p = buf + 4; + + *p++ = (unsigned char) ssl->major_ver; + *p++ = (unsigned char) ssl->minor_ver; + + SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]", + buf[4], buf[5] ) ); + + t = time( NULL ); + *p++ = (unsigned char)( t >> 24 ); + *p++ = (unsigned char)( t >> 16 ); + *p++ = (unsigned char)( t >> 8 ); + *p++ = (unsigned char)( t ); + + SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) ); + + if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 ) + return( ret ); + + p += 28; + + memcpy( ssl->randbytes + 32, buf + 6, 32 ); + + SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 ); + + /* + * 38 . 38 session id length + * 39 . 38+n session id + * 39+n . 40+n chosen ciphersuite + * 41+n . 41+n chosen compression alg. + */ + ssl->session->length = n = 32; + *p++ = (unsigned char) ssl->session->length; + + if( ssl->s_get == NULL || + ssl->s_get( ssl ) != 0 ) + { + /* + * Not found, create a new session id + */ + ssl->resume = 0; + ssl->state++; + + if( ssl->session == NULL ) + { + SSL_DEBUG_MSG( 1, ( "No session struct set" ) ); + return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); + } + + if( ( ret = ssl->f_rng( ssl->p_rng, ssl->session->id, n ) ) != 0 ) + return( ret ); + } + else + { + /* + * Found a matching session, resume it + */ + ssl->resume = 1; + ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC; + + if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); + return( ret ); + } + } + + memcpy( p, ssl->session->id, ssl->session->length ); + p += ssl->session->length; + + SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); + SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n ); + SSL_DEBUG_MSG( 3, ( "%s session has been resumed", + ssl->resume ? "a" : "no" ) ); + + *p++ = (unsigned char)( ssl->session->ciphersuite >> 8 ); + *p++ = (unsigned char)( ssl->session->ciphersuite ); + *p++ = SSL_COMPRESS_NULL; + + SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d", + ssl->session->ciphersuite ) ); + SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", 0 ) ); + + ssl->out_msglen = p - buf; + ssl->out_msgtype = SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = SSL_HS_SERVER_HELLO; + + ret = ssl_write_record( ssl ); + + SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); + + return( ret ); +} + +static int ssl_write_certificate_request( ssl_context *ssl ) +{ + int ret; + size_t n; + unsigned char *buf, *p; + const x509_cert *crt; + + SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); + + ssl->state++; + + if( ssl->authmode == SSL_VERIFY_NONE ) + { + SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); + return( 0 ); + } + + /* + * 0 . 0 handshake type + * 1 . 3 handshake length + * 4 . 4 cert type count + * 5 .. n-1 cert types + * n .. n+1 length of all DNs + * n+2 .. n+3 length of DN 1 + * n+4 .. ... Distinguished Name #1 + * ... .. ... length of DN 2, etc. + */ + buf = ssl->out_msg; + p = buf + 4; + + /* + * At the moment, only RSA certificates are supported + */ + *p++ = 1; + *p++ = 1; + + p += 2; + crt = ssl->ca_chain; + + while( crt != NULL ) + { + if( p - buf > 4096 ) + break; + + n = crt->subject_raw.len; + *p++ = (unsigned char)( n >> 8 ); + *p++ = (unsigned char)( n ); + memcpy( p, crt->subject_raw.p, n ); + + SSL_DEBUG_BUF( 3, "requested DN", p, n ); + p += n; crt = crt->next; + } + + ssl->out_msglen = n = p - buf; + ssl->out_msgtype = SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = SSL_HS_CERTIFICATE_REQUEST; + ssl->out_msg[6] = (unsigned char)( ( n - 8 ) >> 8 ); + ssl->out_msg[7] = (unsigned char)( ( n - 8 ) ); + + ret = ssl_write_record( ssl ); + + SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); + + return( ret ); +} + +static int ssl_write_server_key_exchange( ssl_context *ssl ) +{ +#if defined(POLARSSL_DHM_C) + int ret; + size_t n, rsa_key_len = 0; + unsigned char hash[48]; + md5_context md5; + sha1_context sha1; + int hash_id; + unsigned int hashlen; +#endif + + SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); + + if( ssl->session->ciphersuite != SSL_EDH_RSA_DES_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_DES_168_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA256 && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA256 && + ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA && + ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA256 && + ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA256 && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_GCM_SHA256 && + ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_GCM_SHA384 ) + { + SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); + ssl->state++; + return( 0 ); + } + +#if !defined(POLARSSL_DHM_C) + SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) ); + return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); +#else + + if( ssl->rsa_key == NULL ) + { +#if defined(POLARSSL_PKCS11_C) + if( ssl->pkcs11_key == NULL ) + { +#endif /* defined(POLARSSL_PKCS11_C) */ + SSL_DEBUG_MSG( 1, ( "got no private key" ) ); + return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); +#if defined(POLARSSL_PKCS11_C) + } +#endif /* defined(POLARSSL_PKCS11_C) */ + } + + /* + * Ephemeral DH parameters: + * + * struct { + * opaque dh_p<1..2^16-1>; + * opaque dh_g<1..2^16-1>; + * opaque dh_Ys<1..2^16-1>; + * } ServerDHParams; + */ + if( ( ret = dhm_make_params( &ssl->dhm_ctx, 256, ssl->out_msg + 4, + &n, ssl->f_rng, ssl->p_rng ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "dhm_make_params", ret ); + return( ret ); + } + + SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X ); + SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P ); + SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G ); + SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX ); + + if( ssl->minor_ver != SSL_MINOR_VERSION_3 ) + { + /* + * digitally-signed struct { + * opaque md5_hash[16]; + * opaque sha_hash[20]; + * }; + * + * md5_hash + * MD5(ClientHello.random + ServerHello.random + * + ServerParams); + * sha_hash + * SHA(ClientHello.random + ServerHello.random + * + ServerParams); + */ + md5_starts( &md5 ); + md5_update( &md5, ssl->randbytes, 64 ); + md5_update( &md5, ssl->out_msg + 4, n ); + md5_finish( &md5, hash ); + + sha1_starts( &sha1 ); + sha1_update( &sha1, ssl->randbytes, 64 ); + sha1_update( &sha1, ssl->out_msg + 4, n ); + sha1_finish( &sha1, hash + 16 ); + + hashlen = 36; + hash_id = SIG_RSA_RAW; + } + else + { + /* + * digitally-signed struct { + * opaque client_random[32]; + * opaque server_random[32]; + * ServerDHParams params; + * }; + */ + /* TODO TLS1.2 Get a supported hash algorithm from the + * signature_algorithms extension, Otherwise SHA1 + RSA! + */ + + sha1_starts( &sha1 ); + sha1_update( &sha1, ssl->randbytes, 64 ); + sha1_update( &sha1, ssl->out_msg + 4, n ); + sha1_finish( &sha1, hash ); + + hashlen = 20; + hash_id = SIG_RSA_SHA1; + } + + SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen ); + + if ( ssl->rsa_key ) + rsa_key_len = ssl->rsa_key->len; +#if defined(POLARSSL_PKCS11_C) + else + rsa_key_len = ssl->pkcs11_key->len; +#endif /* defined(POLARSSL_PKCS11_C) */ + + if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) + { + // TODO TLS1.2 Base on selection above (SHA1 + RSA is default choice) + ssl->out_msg[4 + n] = SSL_HASH_SHA1; + ssl->out_msg[5 + n] = SSL_SIG_RSA; + + n += 2; + } + + ssl->out_msg[4 + n] = (unsigned char)( rsa_key_len >> 8 ); + ssl->out_msg[5 + n] = (unsigned char)( rsa_key_len ); + + if ( ssl->rsa_key ) + { + ret = rsa_pkcs1_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng, + RSA_PRIVATE, + hash_id, hashlen, hash, ssl->out_msg + 6 + n ); + } +#if defined(POLARSSL_PKCS11_C) + else { + ret = pkcs11_sign( ssl->pkcs11_key, RSA_PRIVATE, + hash_id, hashlen, hash, ssl->out_msg + 6 + n ); + } +#endif /* defined(POLARSSL_PKCS11_C) */ + + if( ret != 0 ) + { + SSL_DEBUG_RET( 1, "pkcs1_sign", ret ); + return( ret ); + } + + SSL_DEBUG_BUF( 3, "my RSA sig", ssl->out_msg + 6 + n, rsa_key_len ); + + ssl->out_msglen = 6 + n + rsa_key_len; + ssl->out_msgtype = SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE; + + ssl->state++; + + if( ( ret = ssl_write_record( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_write_record", ret ); + return( ret ); + } + + SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); + + return( 0 ); +#endif +} + +static int ssl_write_server_hello_done( ssl_context *ssl ) +{ + int ret; + + SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) ); + + ssl->out_msglen = 4; + ssl->out_msgtype = SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = SSL_HS_SERVER_HELLO_DONE; + + ssl->state++; + + if( ( ret = ssl_write_record( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_write_record", ret ); + return( ret ); + } + + SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) ); + + return( 0 ); +} + +static int ssl_parse_client_key_exchange( ssl_context *ssl ) +{ + int ret; + size_t i, n = 0; + + SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); + + if( ( ret = ssl_read_record( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_read_record", ret ); + return( ret ); + } + + if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ssl->in_msg[0] != SSL_HS_CLIENT_KEY_EXCHANGE ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ssl->session->ciphersuite == SSL_EDH_RSA_DES_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_DES_168_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA256 || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA256 || + ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA || + ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA256 || + ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA256 || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_GCM_SHA256 || + ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 ) + { +#if !defined(POLARSSL_DHM_C) + SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) ); + return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); +#else + /* + * Receive G^Y mod P, premaster = (G^Y)^X mod P + */ + n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; + + if( n < 1 || n > ssl->dhm_ctx.len || + n + 6 != ssl->in_hslen ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ( ret = dhm_read_public( &ssl->dhm_ctx, + ssl->in_msg + 6, n ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "dhm_read_public", ret ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_DHM_RP ); + } + + SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY ); + + ssl->pmslen = ssl->dhm_ctx.len; + + if( ( ret = dhm_calc_secret( &ssl->dhm_ctx, + ssl->premaster, &ssl->pmslen ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_DHM_CS ); + } + + SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K ); +#endif + } + else + { + if( ssl->rsa_key == NULL ) + { +#if defined(POLARSSL_PKCS11_C) + if( ssl->pkcs11_key == NULL ) + { +#endif + SSL_DEBUG_MSG( 1, ( "got no private key" ) ); + return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); +#if defined(POLARSSL_PKCS11_C) + } +#endif + } + + /* + * Decrypt the premaster using own private RSA key + */ + i = 4; + if( ssl->rsa_key ) + n = ssl->rsa_key->len; +#if defined(POLARSSL_PKCS11_C) + else + n = ssl->pkcs11_key->len; +#endif + ssl->pmslen = 48; + + if( ssl->minor_ver != SSL_MINOR_VERSION_0 ) + { + i += 2; + if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) || + ssl->in_msg[5] != ( ( n ) & 0xFF ) ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + } + + if( ssl->in_hslen != i + n ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ssl->rsa_key ) { + ret = rsa_pkcs1_decrypt( ssl->rsa_key, RSA_PRIVATE, &ssl->pmslen, + ssl->in_msg + i, ssl->premaster, + sizeof(ssl->premaster) ); + } +#if defined(POLARSSL_PKCS11_C) + else { + ret = pkcs11_decrypt( ssl->pkcs11_key, RSA_PRIVATE, &ssl->pmslen, + ssl->in_msg + i, ssl->premaster, + sizeof(ssl->premaster) ); + } +#endif /* defined(POLARSSL_PKCS11_C) */ + + if( ret != 0 || ssl->pmslen != 48 || + ssl->premaster[0] != ssl->max_major_ver || + ssl->premaster[1] != ssl->max_minor_ver ) + { + SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + + /* + * Protection against Bleichenbacher's attack: + * invalid PKCS#1 v1.5 padding must not cause + * the connection to end immediately; instead, + * send a bad_record_mac later in the handshake. + */ + ssl->pmslen = 48; + + ret = ssl->f_rng( ssl->p_rng, ssl->premaster, ssl->pmslen ); + if( ret != 0 ) + return( ret ); + } + } + + if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); + return( ret ); + } + + if( ssl->s_set != NULL ) + ssl->s_set( ssl ); + + ssl->state++; + + SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); + + return( 0 ); +} + +static int ssl_parse_certificate_verify( ssl_context *ssl ) +{ + int ret; + size_t n1, n2; + unsigned char hash[48]; + + SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); + + if( ssl->peer_cert == NULL ) + { + SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); + ssl->state++; + return( 0 ); + } + + ssl->calc_verify( ssl, hash ); + + if( ( ret = ssl_read_record( ssl ) ) != 0 ) + { + SSL_DEBUG_RET( 1, "ssl_read_record", ret ); + return( ret ); + } + + ssl->state++; + + if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) + { + SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); + } + + if( ssl->in_msg[0] != SSL_HS_CERTIFICATE_VERIFY ) + { + SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); + } + + n1 = ssl->peer_cert->rsa.len; + n2 = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; + + if( n1 + 6 != ssl->in_hslen || n1 != n2 ) + { + SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); + return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); + } + + ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC, + SIG_RSA_RAW, 36, hash, ssl->in_msg + 6 ); + if( ret != 0 ) + { + SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret ); + return( ret ); + } + + SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) ); + + return( 0 ); +} + +/* + * SSL handshake -- server side + */ +int ssl_handshake_server( ssl_context *ssl ) +{ + int ret = 0; + + SSL_DEBUG_MSG( 2, ( "=> handshake server" ) ); + + while( ssl->state != SSL_HANDSHAKE_OVER ) + { + SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); + + if( ( ret = ssl_flush_output( ssl ) ) != 0 ) + break; + + switch( ssl->state ) + { + case SSL_HELLO_REQUEST: + ssl->state = SSL_CLIENT_HELLO; + break; + + /* + * <== ClientHello + */ + case SSL_CLIENT_HELLO: + ret = ssl_parse_client_hello( ssl ); + break; + + /* + * ==> ServerHello + * Certificate + * ( ServerKeyExchange ) + * ( CertificateRequest ) + * ServerHelloDone + */ + case SSL_SERVER_HELLO: + ret = ssl_write_server_hello( ssl ); + break; + + case SSL_SERVER_CERTIFICATE: + ret = ssl_write_certificate( ssl ); + break; + + case SSL_SERVER_KEY_EXCHANGE: + ret = ssl_write_server_key_exchange( ssl ); + break; + + case SSL_CERTIFICATE_REQUEST: + ret = ssl_write_certificate_request( ssl ); + break; + + case SSL_SERVER_HELLO_DONE: + ret = ssl_write_server_hello_done( ssl ); + break; + + /* + * <== ( Certificate/Alert ) + * ClientKeyExchange + * ( CertificateVerify ) + * ChangeCipherSpec + * Finished + */ + case SSL_CLIENT_CERTIFICATE: + ret = ssl_parse_certificate( ssl ); + break; + + case SSL_CLIENT_KEY_EXCHANGE: + ret = ssl_parse_client_key_exchange( ssl ); + break; + + case SSL_CERTIFICATE_VERIFY: + ret = ssl_parse_certificate_verify( ssl ); + break; + + case SSL_CLIENT_CHANGE_CIPHER_SPEC: + ret = ssl_parse_change_cipher_spec( ssl ); + break; + + case SSL_CLIENT_FINISHED: + ret = ssl_parse_finished( ssl ); + break; + + /* + * ==> ChangeCipherSpec + * Finished + */ + case SSL_SERVER_CHANGE_CIPHER_SPEC: + ret = ssl_write_change_cipher_spec( ssl ); + break; + + case SSL_SERVER_FINISHED: + ret = ssl_write_finished( ssl ); + break; + + case SSL_FLUSH_BUFFERS: + SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); + ssl->state = SSL_HANDSHAKE_OVER; + break; + + default: + SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); + return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); + } + + if( ret != 0 ) + break; + } + + SSL_DEBUG_MSG( 2, ( "<= handshake server" ) ); + + return( ret ); +} + +#endif |