Commit e697a4c3 authored by Emilia Kasper's avatar Emilia Kasper
Browse files

Error out immediately on empty ciphers list. 



A 0-length ciphers list is never permitted. The old code only used to
reject an empty ciphers list for connections with a session ID. It
would later error out on a NULL structure, so this change just moves
the alert closer to the problem source.

Reviewed-by: default avatarRich Salz <rsalz@openssl.org>
(cherry picked from commit 3ae91cfb)
parent 5613feaa

ssl/s3_srvr.c

+6 −7
Original line number Diff line number Diff line
@@ -1125,8 +1125,8 @@ int ssl3_get_client_hello(SSL *s) 
        goto f_err;

    }

    n2s(p, i);

    if ((i == 0) && (j != 0)) {

        /* we need a cipher if we are not resuming a session */



    if (i == 0) {

        al = SSL_AD_ILLEGAL_PARAMETER;

        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED);

        goto f_err;
@@ -1139,14 +1139,13 @@ int ssl3_get_client_hello(SSL *s) 
        SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);

        goto f_err;

    }

    if ((i > 0) && (ssl_bytes_to_cipher_list(s, p, i, &(ciphers))

                    == NULL)) {

    if (ssl_bytes_to_cipher_list(s, p, i, &(ciphers)) == NULL) {

        goto err;

    }

    p += i;



    /* If it is a hit, check that the cipher is in the list */

    if ((s->hit) && (i > 0)) {

    if (s->hit) {

        j = 0;

        id = s->session->cipher->id;
@@ -1375,8 +1374,8 @@ int ssl3_get_client_hello(SSL *s) 
            sk_SSL_CIPHER_free(s->session->ciphers);

        s->session->ciphers = ciphers;

        if (ciphers == NULL) {

            al = SSL_AD_ILLEGAL_PARAMETER;

            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_PASSED);

            al = SSL_AD_INTERNAL_ERROR;

            SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);

            goto f_err;

        }

        ciphers = NULL;