diff options
| author | Matt Caswell <matt@openssl.org> | 2017-04-21 14:00:20 +0100 |
|---|---|---|
| committer | Matt Caswell <matt@openssl.org> | 2017-04-25 11:13:39 +0100 |
| commit | aefb925647175a310df73416c9c7253424a65106 (patch) | |
| tree | 97d2879bf217a87b49a0e9c32a50e120f0e1fb72 /ssl | |
| parent | bd79bcb42bab120575fc398692b7b61b1c5e6ed2 (diff) | |
Don't attempt to send fragments > max_send_fragment in DTLS
We were allocating the write buffer based on the size of max_send_fragment,
but ignoring it when writing data. We should fragment handshake messages
if they exceed max_send_fragment and reject application data writes that
are too large.
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3286)
Diffstat (limited to 'ssl')
| -rw-r--r-- | ssl/record/rec_layer_d1.c | 5 | ||||
| -rw-r--r-- | ssl/ssl_err.c | 2 | ||||
| -rw-r--r-- | ssl/statem/statem_dtls.c | 3 |
3 files changed, 10 insertions, 0 deletions
diff --git a/ssl/record/rec_layer_d1.c b/ssl/record/rec_layer_d1.c index ca7f427377..243eff7004 100644 --- a/ssl/record/rec_layer_d1.c +++ b/ssl/record/rec_layer_d1.c @@ -882,6 +882,11 @@ int do_dtls1_write(SSL *s, int type, const unsigned char *buf, if (len == 0 && !create_empty_fragment) return 0; + if (len > s->max_send_fragment) { + SSLerr(SSL_F_DO_DTLS1_WRITE, SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE); + return 0; + } + sess = s->session; if ((sess == NULL) || diff --git a/ssl/ssl_err.c b/ssl/ssl_err.c index c7e407fc27..296ce0de03 100644 --- a/ssl/ssl_err.c +++ b/ssl/ssl_err.c @@ -590,6 +590,8 @@ static ERR_STRING_DATA SSL_str_reasons[] = { "error in received cipher list"}, {ERR_REASON(SSL_R_ERROR_SETTING_TLSA_BASE_DOMAIN), "error setting tlsa base domain"}, + {ERR_REASON(SSL_R_EXCEEDS_MAX_FRAGMENT_SIZE), + "exceeds max fragment size"}, {ERR_REASON(SSL_R_EXCESSIVE_MESSAGE_SIZE), "excessive message size"}, {ERR_REASON(SSL_R_EXTRA_DATA_IN_MESSAGE), "extra data in message"}, {ERR_REASON(SSL_R_EXT_LENGTH_MISMATCH), "ext length mismatch"}, diff --git a/ssl/statem/statem_dtls.c b/ssl/statem/statem_dtls.c index 34964dbd5d..b2ba35763a 100644 --- a/ssl/statem/statem_dtls.c +++ b/ssl/statem/statem_dtls.c @@ -214,6 +214,9 @@ int dtls1_do_write(SSL *s, int type) else len = s->init_num; + if (len > s->max_send_fragment) + len = s->max_send_fragment; + /* * XDTLS: this function is too long. split out the CCS part */ |