This patch adds support for TLS SessionTicket extension (RFC 5077) for the parts used by EAP-FAST (RFC 4851). This is based on the patch from Alexey Kobozev (sent to openssl-dev mailing list on Tue, 07 Jun 2005 15:40:58 +0300). Index: openssl-SNAP-20081111/ssl/s3_clnt.c =================================================================== --- openssl-SNAP-20081111.orig/ssl/s3_clnt.c +++ openssl-SNAP-20081111/ssl/s3_clnt.c @@ -788,6 +788,23 @@ int ssl3_get_server_hello(SSL *s) goto f_err; } +#ifndef OPENSSL_NO_TLSEXT + /* check if we want to resume the session based on external pre-shared secret */ + if (s->version >= TLS1_VERSION && s->tls_session_secret_cb) + { + SSL_CIPHER *pref_cipher=NULL; + s->session->master_key_length=sizeof(s->session->master_key); + if (s->tls_session_secret_cb(s, s->session->master_key, + &s->session->master_key_length, + NULL, &pref_cipher, + s->tls_session_secret_cb_arg)) + { + s->session->cipher = pref_cipher ? + pref_cipher : ssl_get_cipher_by_char(s, p+j); + } + } +#endif /* OPENSSL_NO_TLSEXT */ + if (j != 0 && j == s->session->session_id_length && memcmp(p,s->session->session_id,j) == 0) { @@ -2927,11 +2944,8 @@ static int ssl3_check_finished(SSL *s) { int ok; long n; - /* If we have no ticket or session ID is non-zero length (a match of - * a non-zero session length would never reach here) it cannot be a - * resumed session. - */ - if (!s->session->tlsext_tick || s->session->session_id_length) + /* If we have no ticket it cannot be a resumed session. */ + if (!s->session->tlsext_tick) return 1; /* this function is called when we really expect a Certificate * message, so permit appropriate message length */ Index: openssl-SNAP-20081111/ssl/s3_srvr.c =================================================================== --- openssl-SNAP-20081111.orig/ssl/s3_srvr.c +++ openssl-SNAP-20081111/ssl/s3_srvr.c @@ -1010,6 +1010,59 @@ int ssl3_get_client_hello(SSL *s) SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); goto err; } + + /* Check if we want to use external pre-shared secret for this + * handshake for not reused session only. We need to generate + * server_random before calling tls_session_secret_cb in order to allow + * SessionTicket processing to use it in key derivation. */ + { + unsigned long Time; + unsigned char *pos; + Time=(unsigned long)time(NULL); /* Time */ + pos=s->s3->server_random; + l2n(Time,pos); + if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0) + { + al=SSL_AD_INTERNAL_ERROR; + goto f_err; + } + } + + if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) + { + SSL_CIPHER *pref_cipher=NULL; + + s->session->master_key_length=sizeof(s->session->master_key); + if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length, + ciphers, &pref_cipher, s->tls_session_secret_cb_arg)) + { + s->hit=1; + s->session->ciphers=ciphers; + s->session->verify_result=X509_V_OK; + + ciphers=NULL; + + /* check if some cipher was preferred by call back */ + pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s)); + if (pref_cipher == NULL) + { + al=SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER); + goto f_err; + } + + s->session->cipher=pref_cipher; + + if (s->cipher_list) + sk_SSL_CIPHER_free(s->cipher_list); + + if (s->cipher_list_by_id) + sk_SSL_CIPHER_free(s->cipher_list_by_id); + + s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); + s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers); + } + } #endif /* Worst case, we will use the NULL compression, but if we have other @@ -1134,16 +1187,22 @@ int ssl3_send_server_hello(SSL *s) unsigned char *buf; unsigned char *p,*d; int i,sl; - unsigned long l,Time; + unsigned long l; +#ifdef OPENSSL_NO_TLSEXT + unsigned long Time; +#endif if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { buf=(unsigned char *)s->init_buf->data; +#ifdef OPENSSL_NO_TLSEXT p=s->s3->server_random; + /* Generate server_random if it was not needed previously */ Time=(unsigned long)time(NULL); /* Time */ l2n(Time,p); if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) return -1; +#endif /* Do the message type and length last */ d=p= &(buf[4]); Index: openssl-SNAP-20081111/ssl/ssl_err.c =================================================================== --- openssl-SNAP-20081111.orig/ssl/ssl_err.c +++ openssl-SNAP-20081111/ssl/ssl_err.c @@ -263,6 +263,7 @@ static ERR_STRING_DATA SSL_str_functs[]= {ERR_FUNC(SSL_F_TLS1_PRF), "tls1_prf"}, {ERR_FUNC(SSL_F_TLS1_SETUP_KEY_BLOCK), "TLS1_SETUP_KEY_BLOCK"}, {ERR_FUNC(SSL_F_WRITE_PENDING), "WRITE_PENDING"}, +{ERR_FUNC(SSL_F_SSL_SET_SESSION_TICKET_EXT), "SSL_set_session_ticket_ext"}, {0,NULL} }; Index: openssl-SNAP-20081111/ssl/ssl.h =================================================================== --- openssl-SNAP-20081111.orig/ssl/ssl.h +++ openssl-SNAP-20081111/ssl/ssl.h @@ -355,6 +355,7 @@ extern "C" { * 'struct ssl_st *' function parameters used to prototype callbacks * in SSL_CTX. */ typedef struct ssl_st *ssl_crock_st; +typedef struct tls_session_ticket_ext_st TLS_SESSION_TICKET_EXT; /* used to hold info on the particular ciphers used */ typedef struct ssl_cipher_st @@ -378,6 +379,8 @@ typedef struct ssl_cipher_st DECLARE_STACK_OF(SSL_CIPHER) +typedef int (*tls_session_secret_cb_fn)(SSL *s, void *secret, int *secret_len, STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg); + /* Used to hold functions for SSLv2 or SSLv3/TLSv1 functions */ typedef struct ssl_method_st { @@ -1145,6 +1148,13 @@ struct ssl_st void *tlsext_opaque_prf_input; size_t tlsext_opaque_prf_input_len; + /* TLS Session Ticket extension override */ + TLS_SESSION_TICKET_EXT *tlsext_session_ticket; + + /* TLS pre-shared secret session resumption */ + tls_session_secret_cb_fn tls_session_secret_cb; + void *tls_session_secret_cb_arg; + SSL_CTX * initial_ctx; /* initial ctx, used to store sessions */ #define session_ctx initial_ctx #else @@ -1746,6 +1756,16 @@ void *SSL_COMP_get_compression_methods(v int SSL_COMP_add_compression_method(int id,void *cm); #endif +/* NOTE: This function will be removed; it is only here for backwards + * compatibility for the API during testing. */ +int SSL_set_hello_extension(SSL *s, int ext_type, void *ext_data, int ext_len); + +/* TLS extensions functions */ +int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len); + +/* Pre-shared secret session resumption functions */ +int SSL_set_session_secret_cb(SSL *s, tls_session_secret_cb_fn tls_session_secret_cb, void *arg); + /* BEGIN ERROR CODES */ /* The following lines are auto generated by the script mkerr.pl. Any changes * made after this point may be overwritten when the script is next run. @@ -1948,6 +1968,7 @@ void ERR_load_SSL_strings(void); #define SSL_F_TLS1_PRF 284 #define SSL_F_TLS1_SETUP_KEY_BLOCK 211 #define SSL_F_WRITE_PENDING 212 +#define SSL_F_SSL_SET_SESSION_TICKET_EXT 213 /* Reason codes. */ #define SSL_R_APP_DATA_IN_HANDSHAKE 100 Index: openssl-SNAP-20081111/ssl/ssl_sess.c =================================================================== --- openssl-SNAP-20081111.orig/ssl/ssl_sess.c +++ openssl-SNAP-20081111/ssl/ssl_sess.c @@ -834,6 +834,62 @@ long SSL_CTX_get_timeout(const SSL_CTX * return(s->session_timeout); } +#ifndef OPENSSL_NO_TLSEXT +int SSL_set_session_secret_cb(SSL *s, int (*tls_session_secret_cb)(SSL *s, void *secret, int *secret_len, + STACK_OF(SSL_CIPHER) *peer_ciphers, SSL_CIPHER **cipher, void *arg), void *arg) + { + if (s == NULL) return(0); + s->tls_session_secret_cb = tls_session_secret_cb; + s->tls_session_secret_cb_arg = arg; + return(1); + } + +int SSL_set_session_ticket_ext(SSL *s, void *ext_data, int ext_len) + { + if (s->version >= TLS1_VERSION) + { + if (s->tlsext_session_ticket) + { + OPENSSL_free(s->tlsext_session_ticket); + s->tlsext_session_ticket = NULL; + } + + s->tlsext_session_ticket = OPENSSL_malloc(sizeof(TLS_SESSION_TICKET_EXT) + ext_len); + if (!s->tlsext_session_ticket) + { + SSLerr(SSL_F_SSL_SET_SESSION_TICKET_EXT, ERR_R_MALLOC_FAILURE); + return 0; + } + + if (ext_data) + { + s->tlsext_session_ticket->length = ext_len; + s->tlsext_session_ticket->data = s->tlsext_session_ticket + 1; + memcpy(s->tlsext_session_ticket->data, ext_data, ext_len); + } + else + { + s->tlsext_session_ticket->length = 0; + s->tlsext_session_ticket->data = NULL; + } + + return 1; + } + + return 0; + } + +/* NOTE: This function will be removed; it is only here for backwards + * compatibility for the API during testing. */ +int SSL_set_hello_extension(SSL *s, int ext_type, void *ext_data, int ext_len) + { + if (ext_type != TLSEXT_TYPE_session_ticket) + return 0; + + return SSL_set_session_ticket_ext(s, ext_data, ext_len); + } +#endif /* OPENSSL_NO_TLSEXT */ + typedef struct timeout_param_st { SSL_CTX *ctx; Index: openssl-SNAP-20081111/ssl/t1_lib.c =================================================================== --- openssl-SNAP-20081111.orig/ssl/t1_lib.c +++ openssl-SNAP-20081111/ssl/t1_lib.c @@ -154,6 +154,12 @@ int tls1_new(SSL *s) void tls1_free(SSL *s) { +#ifndef OPENSSL_NO_TLSEXT + if (s->tlsext_session_ticket) + { + OPENSSL_free(s->tlsext_session_ticket); + } +#endif /* OPENSSL_NO_TLSEXT */ ssl3_free(s); } @@ -357,8 +363,23 @@ unsigned char *ssl_add_clienthello_tlsex int ticklen; if (s->session && s->session->tlsext_tick) ticklen = s->session->tlsext_ticklen; + else if (s->session && s->tlsext_session_ticket && + s->tlsext_session_ticket->data) + { + ticklen = s->tlsext_session_ticket->length; + s->session->tlsext_tick = OPENSSL_malloc(ticklen); + if (!s->session->tlsext_tick) + return NULL; + memcpy(s->session->tlsext_tick, + s->tlsext_session_ticket->data, + ticklen); + s->session->tlsext_ticklen = ticklen; + } else ticklen = 0; + if (ticklen == 0 && s->tlsext_session_ticket && + s->tlsext_session_ticket->data == NULL) + goto skip_ext; /* Check for enough room 2 for extension type, 2 for len * rest for ticket */ @@ -371,6 +392,7 @@ unsigned char *ssl_add_clienthello_tlsex ret += ticklen; } } + skip_ext: #ifdef TLSEXT_TYPE_opaque_prf_input if (s->s3->client_opaque_prf_input != NULL) @@ -1435,6 +1457,15 @@ int tls1_process_ticket(SSL *s, unsigned s->tlsext_ticket_expected = 1; return 0; /* Cache miss */ } + if (s->tls_session_secret_cb) + { + /* Indicate cache miss here and instead of + * generating the session from ticket now, + * trigger abbreviated handshake based on + * external mechanism to calculate the master + * secret later. */ + return 0; + } return tls_decrypt_ticket(s, p, size, session_id, len, ret); } Index: openssl-SNAP-20081111/ssl/tls1.h =================================================================== --- openssl-SNAP-20081111.orig/ssl/tls1.h +++ openssl-SNAP-20081111/ssl/tls1.h @@ -512,6 +512,13 @@ SSL_CTX_callback_ctrl(ssl,SSL_CTRL_SET_T #define TLS_MD_MASTER_SECRET_CONST "\x6d\x61\x73\x74\x65\x72\x20\x73\x65\x63\x72\x65\x74" /*master secret*/ #endif +/* TLS Session Ticket extension struct */ +struct tls_session_ticket_ext_st + { + unsigned short length; + void *data; + }; + #ifdef __cplusplus } #endif Index: openssl-SNAP-20081111/util/ssleay.num =================================================================== --- openssl-SNAP-20081111.orig/util/ssleay.num +++ openssl-SNAP-20081111/util/ssleay.num @@ -254,3 +254,5 @@ PEM_read_bio_SSL_SESSION SSL_CTX_set_psk_server_callback 303 EXIST::FUNCTION:PSK SSL_get_psk_identity 304 EXIST::FUNCTION:PSK PEM_write_SSL_SESSION 305 EXIST:!WIN16:FUNCTION: +SSL_set_session_ticket_ext 306 EXIST::FUNCTION:TLSEXT +SSL_set_session_secret_cb 307 EXIST::FUNCTION:TLSEXT