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Harmonise setting the header and closing construction

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Ensure all message types work the same way including CCS so that the state
machine doesn't need to know about special cases. Put all the special logic
into ssl_set_handshake_header() and ssl_close_construct_packet().

Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Matt Caswell 2016-09-30 10:38:32 +01:00
parent 5923ad4bbe
commit 4a01c59f36
6 changed files with 168 additions and 194 deletions
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4
ssl/s3_lib.c
View File

@ -2779,6 +2779,10 @@ const SSL_CIPHER *ssl3_get_cipher(unsigned int u)
int ssl3_set_handshake_header(SSL *s, WPACKET *pkt, int htype)
{
/* No header in the event of a CCS */
if (htype == SSL3_MT_CHANGE_CIPHER_SPEC)
return 1;
/* Set the content type and 3 bytes for the message len */
if (!WPACKET_put_bytes_u8(pkt, htype)
|| !WPACKET_start_sub_packet_u24(pkt))

10
ssl/ssl_locl.h
View File

@ -1586,7 +1586,7 @@ typedef struct ssl3_enc_method {
/* Set the handshake header */
int (*set_handshake_header) (SSL *s, WPACKET *pkt, int type);
/* Close construction of the handshake message */
int (*close_construct_packet) (SSL *s, WPACKET *pkt);
int (*close_construct_packet) (SSL *s, WPACKET *pkt, int htype);
/* Write out handshake message */
int (*do_write) (SSL *s);
} SSL3_ENC_METHOD;
@ -1596,8 +1596,8 @@ typedef struct ssl3_enc_method {
(((unsigned char *)s->init_buf->data) + s->method->ssl3_enc->hhlen)
# define ssl_set_handshake_header(s, pkt, htype) \
s->method->ssl3_enc->set_handshake_header((s), (pkt), (htype))
# define ssl_close_construct_packet(s, pkt) \
s->method->ssl3_enc->close_construct_packet((s), (pkt))
# define ssl_close_construct_packet(s, pkt, htype) \
s->method->ssl3_enc->close_construct_packet((s), (pkt), (htype))
# define ssl_do_write(s) s->method->ssl3_enc->do_write(s)
/* Values for enc_flags */
@ -1901,9 +1901,9 @@ __owur int ssl3_do_change_cipher_spec(SSL *ssl);
__owur long ssl3_default_timeout(void);
__owur int ssl3_set_handshake_header(SSL *s, WPACKET *pkt, int htype);
__owur int tls_close_construct_packet(SSL *s, WPACKET *pkt);
__owur int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype);
__owur int dtls1_set_handshake_header(SSL *s, WPACKET *pkt, int htype);
__owur int dtls1_close_construct_packet(SSL *s, WPACKET *pkt);
__owur int dtls1_close_construct_packet(SSL *s, WPACKET *pkt, int htype);
__owur int ssl3_handshake_write(SSL *s);
__owur int ssl_allow_compression(SSL *s);

104
ssl/statem/statem_clnt.c
View File

@ -516,69 +516,69 @@ int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt)
int (*confunc) (SSL *s, WPACKET *pkt) = NULL;
int ret = 1, mt;
if (st->hand_state == TLS_ST_CW_CHANGE) {
/* Special case becase it is a different content type */
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_CW_CHANGE:
if (SSL_IS_DTLS(s))
return dtls_construct_change_cipher_spec(s, pkt);
confunc = dtls_construct_change_cipher_spec;
else
confunc = tls_construct_change_cipher_spec;
mt = SSL3_MT_CHANGE_CIPHER_SPEC;
break;
return tls_construct_change_cipher_spec(s, pkt);
} else {
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_CW_CLNT_HELLO:
confunc = tls_construct_client_hello;
mt = SSL3_MT_CLIENT_HELLO;
break;
case TLS_ST_CW_CLNT_HELLO:
confunc = tls_construct_client_hello;
mt = SSL3_MT_CLIENT_HELLO;
break;
case TLS_ST_CW_CERT:
confunc = tls_construct_client_certificate;
mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_CW_CERT:
confunc = tls_construct_client_certificate;
mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_CW_KEY_EXCH:
confunc = tls_construct_client_key_exchange;
mt = SSL3_MT_CLIENT_KEY_EXCHANGE;
break;
case TLS_ST_CW_KEY_EXCH:
confunc = tls_construct_client_key_exchange;
mt = SSL3_MT_CLIENT_KEY_EXCHANGE;
break;
case TLS_ST_CW_CERT_VRFY:
confunc = tls_construct_client_verify;
mt = SSL3_MT_CERTIFICATE_VERIFY;
break;
case TLS_ST_CW_CERT_VRFY:
confunc = tls_construct_client_verify;
mt = SSL3_MT_CERTIFICATE_VERIFY;
break;
#if !defined(OPENSSL_NO_NEXTPROTONEG)
case TLS_ST_CW_NEXT_PROTO:
confunc = tls_construct_next_proto;
mt = SSL3_MT_NEXT_PROTO;
break;
case TLS_ST_CW_NEXT_PROTO:
confunc = tls_construct_next_proto;
mt = SSL3_MT_NEXT_PROTO;
break;
#endif
case TLS_ST_CW_FINISHED:
mt = SSL3_MT_FINISHED;
break;
}
case TLS_ST_CW_FINISHED:
mt = SSL3_MT_FINISHED;
break;
}
if (!ssl_set_handshake_header(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_CLIENT_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (!ssl_set_handshake_header(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_CLIENT_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (st->hand_state == TLS_ST_CW_FINISHED)
ret = tls_construct_finished(s, pkt,
s->method->
ssl3_enc->client_finished_label,
s->method->
ssl3_enc->client_finished_label_len);
else
ret = confunc(s, pkt);
if (st->hand_state == TLS_ST_CW_FINISHED)
ret = tls_construct_finished(s, pkt,
s->method->
ssl3_enc->client_finished_label,
s->method->
ssl3_enc->client_finished_label_len);
else
ret = confunc(s, pkt);
if (!ret || !ssl_close_construct_packet(s, pkt)) {
SSLerr(SSL_F_OSSL_STATEM_CLIENT_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (!ret || !ssl_close_construct_packet(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_CLIENT_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
return 1;
}

72
ssl/statem/statem_dtls.c
View File

@ -874,41 +874,16 @@ static int dtls_get_reassembled_message(SSL *s, long *len)
*/
int dtls_construct_change_cipher_spec(SSL *s, WPACKET *pkt)
{
if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) {
SSLerr(SSL_F_DTLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
goto err;
}
s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
s->init_num = DTLS1_CCS_HEADER_LENGTH;
if (s->version == DTLS1_BAD_VER) {
s->d1->next_handshake_write_seq++;
if (!WPACKET_put_bytes_u16(pkt, s->d1->handshake_write_seq)) {
SSLerr(SSL_F_DTLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
goto err;
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
}
s->init_num += 2;
}
s->init_off = 0;
dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
s->d1->handshake_write_seq, 0, 0);
/* buffer the message to handle re-xmits */
if (!dtls1_buffer_message(s, 1)) {
SSLerr(SSL_F_DTLS_CONSTRUCT_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR);
goto err ;
}
return 1;
err:
ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
return 0;
}
#ifndef OPENSSL_NO_SCTP
@ -1206,35 +1181,48 @@ int dtls1_set_handshake_header(SSL *s, WPACKET *pkt, int htype)
{
unsigned char *header;
dtls1_set_message_header(s, htype, 0, 0, 0);
/*
* We allocate space at the start for the message header. This gets filled
* in later
*/
if (!WPACKET_allocate_bytes(pkt, DTLS1_HM_HEADER_LENGTH, &header)
|| !WPACKET_start_sub_packet(pkt))
return 0;
if (htype == SSL3_MT_CHANGE_CIPHER_SPEC) {
s->d1->handshake_write_seq = s->d1->next_handshake_write_seq;
dtls1_set_message_header_int(s, SSL3_MT_CCS, 0,
s->d1->handshake_write_seq, 0, 0);
if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS))
return 0;
} else {
dtls1_set_message_header(s, htype, 0, 0, 0);
/*
* We allocate space at the start for the message header. This gets
* filled in later
*/
if (!WPACKET_allocate_bytes(pkt, DTLS1_HM_HEADER_LENGTH, &header)
|| !WPACKET_start_sub_packet(pkt))
return 0;
}
return 1;
}
int dtls1_close_construct_packet(SSL *s, WPACKET *pkt)
int dtls1_close_construct_packet(SSL *s, WPACKET *pkt, int htype)
{
size_t msglen;
if (!WPACKET_close(pkt)
if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt))
|| !WPACKET_get_length(pkt, &msglen)
|| msglen > INT_MAX)
return 0;
s->d1->w_msg_hdr.msg_len = msglen - DTLS1_HM_HEADER_LENGTH;
s->d1->w_msg_hdr.frag_len = msglen - DTLS1_HM_HEADER_LENGTH;
if (htype != SSL3_MT_CHANGE_CIPHER_SPEC) {
s->d1->w_msg_hdr.msg_len = msglen - DTLS1_HM_HEADER_LENGTH;
s->d1->w_msg_hdr.frag_len = msglen - DTLS1_HM_HEADER_LENGTH;
}
s->init_num = (int)msglen;
s->init_off = 0;
/* Buffer the message to handle re-xmits */
if (!dtls1_buffer_message(s, 0))
return 0;
if (htype != DTLS1_MT_HELLO_VERIFY_REQUEST) {
/* Buffer the message to handle re-xmits */
if (!dtls1_buffer_message(s, htype == SSL3_MT_CHANGE_CIPHER_SPEC
? 1 : 0))
return 0;
}
return 1;
}

7
ssl/statem/statem_lib.c
View File

@ -57,11 +57,11 @@ int ssl3_do_write(SSL *s, int type)
return (0);
}
int tls_close_construct_packet(SSL *s, WPACKET *pkt)
int tls_close_construct_packet(SSL *s, WPACKET *pkt, int htype)
{
size_t msglen;
if (!WPACKET_close(pkt)
if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt))
|| !WPACKET_get_length(pkt, &msglen)
|| msglen > INT_MAX)
return 0;
@ -260,9 +260,6 @@ int tls_construct_change_cipher_spec(SSL *s, WPACKET *pkt)
return 0;
}
s->init_num = 1;
s->init_off = 0;
return 1;
}

165
ssl/statem/statem_srvr.c
View File

@ -625,87 +625,90 @@ int ossl_statem_server_construct_message(SSL *s, WPACKET *pkt)
int (*confunc) (SSL *s, WPACKET *pkt) = NULL;
int ret = 1, mt;
if (st->hand_state == TLS_ST_SW_CHANGE) {
/* Special case becase it is a different content type */
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case TLS_ST_SW_CHANGE:
if (SSL_IS_DTLS(s))
return dtls_construct_change_cipher_spec(s, pkt);
confunc = dtls_construct_change_cipher_spec;
else
confunc = tls_construct_change_cipher_spec;
mt = SSL3_MT_CHANGE_CIPHER_SPEC;
break;
return tls_construct_change_cipher_spec(s, pkt);
} else if (st->hand_state == DTLS_ST_SW_HELLO_VERIFY_REQUEST) {
/* Special case because we don't call ssl_close_construct_packet() */
return dtls_construct_hello_verify_request(s, pkt);
} else {
switch (st->hand_state) {
default:
/* Shouldn't happen */
return 0;
case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
confunc = dtls_construct_hello_verify_request;
mt = DTLS1_MT_HELLO_VERIFY_REQUEST;
break;
case TLS_ST_SW_HELLO_REQ:
/* No construction function needed */
mt = SSL3_MT_HELLO_REQUEST;
break;
case TLS_ST_SW_HELLO_REQ:
/* No construction function needed */
mt = SSL3_MT_HELLO_REQUEST;
break;
case TLS_ST_SW_SRVR_HELLO:
confunc = tls_construct_server_hello;
mt = SSL3_MT_SERVER_HELLO;
break;
case TLS_ST_SW_SRVR_HELLO:
confunc = tls_construct_server_hello;
mt = SSL3_MT_SERVER_HELLO;
break;
case TLS_ST_SW_CERT:
confunc = tls_construct_server_certificate;
mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_SW_CERT:
confunc = tls_construct_server_certificate;
mt = SSL3_MT_CERTIFICATE;
break;
case TLS_ST_SW_KEY_EXCH:
confunc = tls_construct_server_key_exchange;
mt = SSL3_MT_SERVER_KEY_EXCHANGE;
break;
case TLS_ST_SW_KEY_EXCH:
confunc = tls_construct_server_key_exchange;
mt = SSL3_MT_SERVER_KEY_EXCHANGE;
break;
case TLS_ST_SW_CERT_REQ:
confunc = tls_construct_certificate_request;
mt = SSL3_MT_CERTIFICATE_REQUEST;
break;
case TLS_ST_SW_CERT_REQ:
confunc = tls_construct_certificate_request;
mt = SSL3_MT_CERTIFICATE_REQUEST;
break;
case TLS_ST_SW_SRVR_DONE:
confunc = tls_construct_server_done;
mt = SSL3_MT_SERVER_DONE;
break;
case TLS_ST_SW_SRVR_DONE:
confunc = tls_construct_server_done;
mt = SSL3_MT_SERVER_DONE;
break;
case TLS_ST_SW_SESSION_TICKET:
confunc = tls_construct_new_session_ticket;
mt = SSL3_MT_NEWSESSION_TICKET;
break;
case TLS_ST_SW_SESSION_TICKET:
confunc = tls_construct_new_session_ticket;
mt = SSL3_MT_NEWSESSION_TICKET;
break;
case TLS_ST_SW_CERT_STATUS:
confunc = tls_construct_cert_status;
mt = SSL3_MT_CERTIFICATE_STATUS;
break;
case TLS_ST_SW_CERT_STATUS:
confunc = tls_construct_cert_status;
mt = SSL3_MT_CERTIFICATE_STATUS;
break;
case TLS_ST_SW_FINISHED:
mt = SSL3_MT_FINISHED;
break;
}
if (!ssl_set_handshake_header(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (st->hand_state == TLS_ST_SW_FINISHED)
ret = tls_construct_finished(s, pkt,
s->method->
ssl3_enc->server_finished_label,
s->method->
ssl3_enc->server_finished_label_len);
else if (confunc != NULL)
ret = confunc(s, pkt);
if (!ret || !ssl_close_construct_packet(s, pkt)) {
SSLerr(SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
case TLS_ST_SW_FINISHED:
mt = SSL3_MT_FINISHED;
break;
}
if (!ssl_set_handshake_header(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
if (st->hand_state == TLS_ST_SW_FINISHED)
ret = tls_construct_finished(s, pkt,
s->method->
ssl3_enc->server_finished_label,
s->method->
ssl3_enc->server_finished_label_len);
else if (confunc != NULL)
ret = confunc(s, pkt);
if (!ret || !ssl_close_construct_packet(s, pkt, mt)) {
SSLerr(SSL_F_OSSL_STATEM_SERVER_CONSTRUCT_MESSAGE,
ERR_R_INTERNAL_ERROR);
return 0;
}
return 1;
}
@ -881,8 +884,6 @@ int dtls_raw_hello_verify_request(WPACKET *pkt, unsigned char *cookie,
int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
{
size_t msglen;
if (s->ctx->app_gen_cookie_cb == NULL ||
s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
&(s->d1->cookie_len)) == 0 ||
@ -892,27 +893,12 @@ int dtls_construct_hello_verify_request(SSL *s, WPACKET *pkt)
return 0;
}
if (!ssl_set_handshake_header(s, pkt,
DTLS1_MT_HELLO_VERIFY_REQUEST)
|| !dtls_raw_hello_verify_request(pkt, s->d1->cookie,
s->d1->cookie_len)
/*
* We don't call close_construct_packet() because we don't want
* to buffer this message
*/
|| !WPACKET_close(pkt)
|| !WPACKET_get_length(pkt, &msglen)
|| !WPACKET_finish(pkt)) {
if (!dtls_raw_hello_verify_request(pkt, s->d1->cookie,
s->d1->cookie_len)) {
SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST, ERR_R_INTERNAL_ERROR);
return 0;
}
/* number of bytes to write */
s->d1->w_msg_hdr.msg_len = msglen - DTLS1_HM_HEADER_LENGTH;
s->d1->w_msg_hdr.frag_len = msglen - DTLS1_HM_HEADER_LENGTH;
s->init_num = (int)msglen;
s->init_off = 0;
return 1;
}
@ -3002,8 +2988,7 @@ int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
/* Put timeout and length */
if (!WPACKET_put_bytes_u32(pkt, 0)
|| !WPACKET_put_bytes_u16(pkt, 0)
|| !ssl_close_construct_packet(s, pkt)) {
|| !WPACKET_put_bytes_u16(pkt, 0)) {
SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET,
ERR_R_INTERNAL_ERROR);
goto err;