X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fs3_srvr.c;h=587dc86175039c53ad4de6cdb7a9d6f8ad8a1fda;hp=197a498924d63870c520f748c735c3e1920483e3;hb=5733919dbca0b2469673a38ec4290d663d594ae4;hpb=70051b1d88497829470b8d63cbc326fff8d5c1c7 diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c index 197a498924..587dc86175 100644 --- a/ssl/s3_srvr.c +++ b/ssl/s3_srvr.c @@ -181,24 +181,25 @@ static const SSL_METHOD *ssl3_get_server_method(int ver) } #ifndef OPENSSL_NO_SRP -static int SSL_check_srp_ext_ClientHello(SSL *s,int *ad) +static int ssl_check_srp_ext_ClientHello(SSL *s,int *al) { int ret = SSL_ERROR_NONE; - *ad = SSL_AD_UNRECOGNIZED_NAME; + *al = SSL_AD_UNRECOGNIZED_NAME; if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) && (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) { if(s->srp_ctx.login == NULL) { - /* There isn't any srp login extension !!! */ - ret = SSL3_AL_WARNING; - *ad = SSL_AD_MISSING_SRP_USERNAME; + /* RFC 5054 says SHOULD reject, + we do so if There is no srp login name */ + ret = SSL3_AL_FATAL; + *al = SSL_AD_UNKNOWN_PSK_IDENTITY; } else { - ret = SSL_srp_server_param_with_username(s,ad); + ret = SSL_srp_server_param_with_username(s,al); } } return ret; @@ -217,9 +218,6 @@ int ssl3_accept(SSL *s) void (*cb)(const SSL *ssl,int type,int val)=NULL; int ret= -1; int new_state,state,skip=0; -#ifndef OPENSSL_NO_SRP - int srp_no_username =0; -#endif RAND_add(&Time,sizeof(Time),0); ERR_clear_error(); @@ -240,6 +238,18 @@ int ssl3_accept(SSL *s) return(-1); } +#ifndef OPENSSL_NO_HEARTBEATS + /* If we're awaiting a HeartbeatResponse, pretend we + * already got and don't await it anymore, because + * Heartbeats don't make sense during handshakes anyway. + */ + if (s->tlsext_hb_pending) + { + s->tlsext_hb_pending = 0; + s->tlsext_hb_seq++; + } +#endif + for (;;) { state=s->state; @@ -287,6 +297,7 @@ int ssl3_accept(SSL *s) } s->init_num=0; + s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE; if (s->state != SSL_ST_RENEGOTIATE) { @@ -340,37 +351,34 @@ int ssl3_accept(SSL *s) case SSL3_ST_SR_CLNT_HELLO_A: case SSL3_ST_SR_CLNT_HELLO_B: case SSL3_ST_SR_CLNT_HELLO_C: -#ifndef OPENSSL_NO_SRP - case SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME: -#endif - s->shutdown=0; - ret=ssl3_get_client_hello(s); - if (ret <= 0) goto end; + if (s->rwstate != SSL_X509_LOOKUP) + { + ret=ssl3_get_client_hello(s); + if (ret <= 0) goto end; + } #ifndef OPENSSL_NO_SRP { - int extension_error = 0,al; - - if ((al = SSL_check_srp_ext_ClientHello(s,&extension_error)) != SSL_ERROR_NONE) - { - ssl3_send_alert(s,al,extension_error); - if (extension_error == SSL_AD_MISSING_SRP_USERNAME) + int al; + if ((ret = ssl_check_srp_ext_ClientHello(s,&al)) < 0) { - if (srp_no_username) goto end; - ERR_clear_error(); - srp_no_username = 1; - s->state=SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME; - if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); - if ((ret=BIO_flush(s->wbio)) <= 0) goto end; - s->init_num=0; - break; + /* callback indicates firther work to be done */ + s->rwstate=SSL_X509_LOOKUP; + goto end; } - ret = -1; - SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT); - goto end; + if (ret != SSL_ERROR_NONE) + { + ssl3_send_alert(s,SSL3_AL_FATAL,al); + /* This is not really an error but the only means to + for a client to detect whether srp is supported. */ + if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) + SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT); + ret = SSL_TLSEXT_ERR_ALERT_FATAL; + ret= -1; + goto end; } } -#endif +#endif s->renegotiate = 2; s->state=SSL3_ST_SW_SRVR_HELLO_A; @@ -695,14 +703,11 @@ int ssl3_accept(SSL *s) ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, SSL3_ST_SR_FINISHED_B); if (ret <= 0) goto end; -#ifndef OPENSSL_NO_TLSEXT - if (s->tlsext_ticket_expected) - s->state=SSL3_ST_SW_SESSION_TICKET_A; - else if (s->hit) - s->state=SSL_ST_OK; -#else if (s->hit) s->state=SSL_ST_OK; +#ifndef OPENSSL_NO_TLSEXT + else if (s->tlsext_ticket_expected) + s->state=SSL3_ST_SW_SESSION_TICKET_A; #endif else s->state=SSL3_ST_SW_CHANGE_A; @@ -789,9 +794,6 @@ int ssl3_accept(SSL *s) if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ { - /* actually not necessarily a 'new' session unless - * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ - s->renegotiate=0; s->new_session=0; @@ -870,6 +872,14 @@ int ssl3_check_client_hello(SSL *s) int ok; long n; + /* We only allow the client to restart the handshake once per + * negotiation. */ + if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE) + { + SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS); + return -1; + } + /* this function is called when we really expect a Certificate message, * so permit appropriate message length */ n=s->method->ssl_get_message(s, @@ -883,9 +893,7 @@ int ssl3_check_client_hello(SSL *s) if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO) { /* Throw away what we have done so far in the current handshake, - * which will now be aborted. (A full SSL_clear would be too much.) - * I hope that tmp.dh is the only thing that may need to be cleared - * when a handshake is not completed ... */ + * which will now be aborted. (A full SSL_clear would be too much.) */ #ifndef OPENSSL_NO_DH if (s->s3->tmp.dh != NULL) { @@ -893,6 +901,14 @@ int ssl3_check_client_hello(SSL *s) s->s3->tmp.dh = NULL; } #endif +#ifndef OPENSSL_NO_ECDH + if (s->s3->tmp.ecdh != NULL) + { + EC_KEY_free(s->s3->tmp.ecdh); + s->s3->tmp.ecdh = NULL; + } +#endif + s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE; return 2; } return 1; @@ -918,9 +934,6 @@ int ssl3_get_client_hello(SSL *s) * TLSv1. */ if (s->state == SSL3_ST_SR_CLNT_HELLO_A -#ifndef OPENSSL_NO_SRP - || (s->state == SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME) -#endif ) { s->state=SSL3_ST_SR_CLNT_HELLO_B; @@ -978,13 +991,16 @@ int ssl3_get_client_hello(SSL *s) j= *(p++); s->hit=0; - /* Versions before 0.9.7 always allow session reuse during renegotiation - * (i.e. when s->new_session is true), option - * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7. - * Maybe this optional behaviour should always have been the default, - * but we cannot safely change the default behaviour (or new applications - * might be written that become totally unsecure when compiled with - * an earlier library version) + /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation. + * 0.9.7 and later allow this by default, but optionally ignore resumption requests + * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather + * than a change to default behavior so that applications relying on this for security + * won't even compile against older library versions). + * + * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request + * renegotiation but not a new session (s->new_session remains unset): for servers, + * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION + * setting will be ignored. */ if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { @@ -1439,20 +1455,20 @@ int ssl3_send_server_hello(SSL *s) memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); p+=SSL3_RANDOM_SIZE; - /* now in theory we have 3 options to sending back the - * session id. If it is a re-use, we send back the - * old session-id, if it is a new session, we send - * back the new session-id or we send back a 0 length - * session-id if we want it to be single use. - * Currently I will not implement the '0' length session-id - * 12-Jan-98 - I'll now support the '0' length stuff. - * - * We also have an additional case where stateless session - * resumption is successful: we always send back the old - * session id. In this case s->hit is non zero: this can - * only happen if stateless session resumption is succesful - * if session caching is disabled so existing functionality - * is unaffected. + /* There are several cases for the session ID to send + * back in the server hello: + * - For session reuse from the session cache, + * we send back the old session ID. + * - If stateless session reuse (using a session ticket) + * is successful, we send back the client's "session ID" + * (which doesn't actually identify the session). + * - If it is a new session, we send back the new + * session ID. + * - However, if we want the new session to be single-use, + * we send back a 0-length session ID. + * s->hit is non-zero in either case of session reuse, + * so the following won't overwrite an ID that we're supposed + * to send back. */ if (s->session->not_resumable || (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) @@ -1622,7 +1638,6 @@ int ssl3_send_server_key_exchange(SSL *s) if (s->s3->tmp.dh != NULL) { - DH_free(dh); SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } @@ -1683,7 +1698,6 @@ int ssl3_send_server_key_exchange(SSL *s) if (s->s3->tmp.ecdh != NULL) { - EC_KEY_free(s->s3->tmp.ecdh); SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); goto err; } @@ -1694,12 +1708,11 @@ int ssl3_send_server_key_exchange(SSL *s) SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); goto err; } - if (!EC_KEY_up_ref(ecdhp)) + if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) { SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); goto err; } - ecdh = ecdhp; s->s3->tmp.ecdh=ecdh; if ((EC_KEY_get0_public_key(ecdh) == NULL) || @@ -2611,6 +2624,12 @@ int ssl3_get_client_key_exchange(SSL *s) /* Get encoded point length */ i = *p; p += 1; + if (n != 1 + i) + { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + ERR_R_EC_LIB); + goto err; + } if (EC_POINT_oct2point(group, clnt_ecpoint, p, i, bn_ctx) == 0) { @@ -3333,13 +3352,17 @@ int ssl3_send_server_certificate(SSL *s) /* SSL3_ST_SW_CERT_B */ return(ssl3_do_write(s,SSL3_RT_HANDSHAKE)); } + #ifndef OPENSSL_NO_TLSEXT +/* send a new session ticket (not necessarily for a new session) */ int ssl3_send_newsession_ticket(SSL *s) { if (s->state == SSL3_ST_SW_SESSION_TICKET_A) { unsigned char *p, *senc, *macstart; - int len, slen; + const unsigned char *const_p; + int len, slen_full, slen; + SSL_SESSION *sess; unsigned int hlen; EVP_CIPHER_CTX ctx; HMAC_CTX hctx; @@ -3348,12 +3371,38 @@ int ssl3_send_newsession_ticket(SSL *s) unsigned char key_name[16]; /* get session encoding length */ - slen = i2d_SSL_SESSION(s->session, NULL); + slen_full = i2d_SSL_SESSION(s->session, NULL); /* Some length values are 16 bits, so forget it if session is * too long */ - if (slen > 0xFF00) + if (slen_full > 0xFF00) return -1; + senc = OPENSSL_malloc(slen_full); + if (!senc) + return -1; + p = senc; + i2d_SSL_SESSION(s->session, &p); + + /* create a fresh copy (not shared with other threads) to clean up */ + const_p = senc; + sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); + if (sess == NULL) + { + OPENSSL_free(senc); + return -1; + } + sess->session_id_length = 0; /* ID is irrelevant for the ticket */ + + slen = i2d_SSL_SESSION(sess, NULL); + if (slen > slen_full) /* shouldn't ever happen */ + { + OPENSSL_free(senc); + return -1; + } + p = senc; + i2d_SSL_SESSION(sess, &p); + SSL_SESSION_free(sess); + /* Grow buffer if need be: the length calculation is as * follows 1 (size of message name) + 3 (message length * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) + @@ -3365,11 +3414,6 @@ int ssl3_send_newsession_ticket(SSL *s) 26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) return -1; - senc = OPENSSL_malloc(slen); - if (!senc) - return -1; - p = senc; - i2d_SSL_SESSION(s->session, &p); p=(unsigned char *)s->init_buf->data; /* do the header */ @@ -3400,7 +3444,13 @@ int ssl3_send_newsession_ticket(SSL *s) tlsext_tick_md(), NULL); memcpy(key_name, tctx->tlsext_tick_key_name, 16); } - l2n(s->session->tlsext_tick_lifetime_hint, p); + + /* Ticket lifetime hint (advisory only): + * We leave this unspecified for resumed session (for simplicity), + * and guess that tickets for new sessions will live as long + * as their sessions. */ + l2n(s->hit ? 0 : s->session->timeout, p); + /* Skip ticket length for now */ p += 2; /* Output key name */