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Use a callback to set our DH parameters; set SSL_OP_SINGLE_DH_USE.

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svn:r5371
This commit is contained in:
Nick Mathewson 2005-11-14 19:20:47 +00:00
parent 887178e710
commit 027d0ef18c
1 changed files with 18 additions and 3 deletions
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21
src/common/tortls.c
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@ -290,6 +290,21 @@ tor_tls_create_certificate(crypto_pk_env_t *rsa,
#define CIPHER_LIST SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA
#endif
static DH *
dh_callback(SSL *ssl, int is_export, int keylength)
{
DH *dh;
crypto_dh_env_t *env = crypto_dh_new();
crypto_dh_generate_public(env);
dh = _crypto_dh_env_get_dh(env);
notice(LD_CRYPTO, "%d references to the DH key?", dh->references);
++dh->references;
crypto_dh_free(env);
--dh->references;
notice(LD_CRYPTO, "%d references to the DH key!", dh->references);
return dh;
}
/** Create a new TLS context. If we are going to be using it as a
* server, it must have isServer set to true, <b>identity</b> set to the
* identity key used to sign that certificate, and <b>nickname</b> set to
@ -352,6 +367,7 @@ tor_tls_context_new(crypto_pk_env_t *identity,
goto error;
SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2);
#endif
SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE);
if (!SSL_CTX_set_cipher_list(*ctx, CIPHER_LIST))
goto error;
if (!client_only) {
@ -375,9 +391,7 @@ tor_tls_context_new(crypto_pk_env_t *identity,
if (!SSL_CTX_check_private_key(*ctx))
goto error;
}
dh = crypto_dh_new();
SSL_CTX_set_tmp_dh(*ctx, _crypto_dh_env_get_dh(dh));
crypto_dh_free(dh);
SSL_CTX_set_tmp_dh_callback(*ctx, dh_callback);
SSL_CTX_set_verify(*ctx, SSL_VERIFY_PEER,
always_accept_verify_cb);
/* let us realloc bufs that we're writing from */
@ -438,6 +452,7 @@ tor_tls_new(int sock, int isServer, int use_no_cert)
result->state = TOR_TLS_ST_HANDSHAKE;
result->isServer = isServer;
result->wantwrite_n = 0;
SSL_set_tmp_dh_callback(result->ssl,dh_callback);
/* Not expected to get called. */
tls_log_errors(LOG_WARN, "generating TLS context");
return result;