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Handle SSL_shutdown while in init more appropriately

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Calling SSL_shutdown while in init previously gave a "1" response, meaning
everything was successfully closed down (even though it wasn't). Better is
to send our close_notify, but fail when trying to receive one.

The problem with doing a shutdown while in the middle of a handshake is
that once our close_notify is sent we shouldn't really do anything else
(including process handshake/CCS messages) until we've received a
close_notify back from the peer. However the peer might send a CCS before
acting on our close_notify - so we won't be able to read it because we're
not acting on CCS messages!

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
This commit is contained in:
Matt Caswell 2015-12-07 16:50:38 +00:00
parent 3aeb934865
commit 7bb196a71a
4 changed files with 20 additions and 4 deletions
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2
include/openssl/ssl.h
View File

@ -1992,6 +1992,7 @@ void ERR_load_SSL_strings(void);
# define SSL_F_SSL3_SETUP_KEY_BLOCK 157
# define SSL_F_SSL3_SETUP_READ_BUFFER 156
# define SSL_F_SSL3_SETUP_WRITE_BUFFER 291
# define SSL_F_SSL3_SHUTDOWN 396
# define SSL_F_SSL3_WRITE_BYTES 158
# define SSL_F_SSL3_WRITE_PENDING 159
# define SSL_F_SSL_ACCEPT 390
@ -2344,6 +2345,7 @@ void ERR_load_SSL_strings(void);
# define SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING 345
# define SSL_R_SERVERHELLO_TLSEXT 275
# define SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED 277
# define SSL_R_SHUTDOWN_WHILE_IN_INIT 407
# define SSL_R_SIGNATURE_ALGORITHMS_ERROR 360
# define SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE 220
# define SSL_R_SRP_A_CALC 361

15
ssl/s3_lib.c
View File

@ -4328,6 +4328,21 @@ int ssl3_shutdown(SSL *s)
return (ret);
}
} else if (!(s->shutdown & SSL_RECEIVED_SHUTDOWN)) {
if (SSL_in_init(s)) {
/*
* We can't shutdown properly if we are in the middle of a
* handshake. Doing so is problematic because the peer may send a
* CCS before it acts on our close_notify. However we should not
* continue to process received handshake messages or CCS once our
* close_notify has been sent. Therefore any close_notify from
* the peer will be unreadable because we have not moved to the next
* cipher state. Its best just to avoid this can-of-worms. Return
* an error if we are wanting to wait for a close_notify from the
* peer and we are in init.
*/
SSLerr(SSL_F_SSL3_SHUTDOWN, SSL_R_SHUTDOWN_WHILE_IN_INIT);
return -1;
}
/*
* If we are waiting for a close from our peer, we are closed
*/

2
ssl/ssl_err.c
View File

@ -128,6 +128,7 @@ static ERR_STRING_DATA SSL_str_functs[] = {
{ERR_FUNC(SSL_F_SSL3_SETUP_KEY_BLOCK), "ssl3_setup_key_block"},
{ERR_FUNC(SSL_F_SSL3_SETUP_READ_BUFFER), "ssl3_setup_read_buffer"},
{ERR_FUNC(SSL_F_SSL3_SETUP_WRITE_BUFFER), "ssl3_setup_write_buffer"},
{ERR_FUNC(SSL_F_SSL3_SHUTDOWN), "ssl3_shutdown"},
{ERR_FUNC(SSL_F_SSL3_WRITE_BYTES), "ssl3_write_bytes"},
{ERR_FUNC(SSL_F_SSL3_WRITE_PENDING), "ssl3_write_pending"},
{ERR_FUNC(SSL_F_SSL_ACCEPT), "SSL_accept"},
@ -577,6 +578,7 @@ static ERR_STRING_DATA SSL_str_reasons[] = {
{ERR_REASON(SSL_R_SERVERHELLO_TLSEXT), "serverhello tlsext"},
{ERR_REASON(SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED),
"session id context uninitialized"},
{ERR_REASON(SSL_R_SHUTDOWN_WHILE_IN_INIT), "shutdown while in init"},
{ERR_REASON(SSL_R_SIGNATURE_ALGORITHMS_ERROR),
"signature algorithms error"},
{ERR_REASON(SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE),

5
ssl/ssl_lib.c
View File

@ -1564,10 +1564,7 @@ int SSL_shutdown(SSL *s)
return -1;
}
if (!SSL_in_init(s))
return (s->method->ssl_shutdown(s));
else
return (1);
return s->method->ssl_shutdown(s);
}
int SSL_renegotiate(SSL *s)