+ BIO_printf(bio_err," -starttls prot - use the STARTTLS command before starting TLS\n");
+ BIO_printf(bio_err," for those protocols that support it, where\n");
+ BIO_printf(bio_err," 'prot' defines which one to assume. Currently,\n");
+ BIO_printf(bio_err," only \"smtp\", \"pop3\", \"imap\", \"ftp\" and \"xmpp\"\n");
+ BIO_printf(bio_err," are supported.\n");
+ BIO_printf(bio_err," -xmpphost host - When used with \"-starttls xmpp\" specifies the virtual host.\n");
+#ifndef OPENSSL_NO_ENGINE
+ BIO_printf(bio_err," -engine id - Initialise and use the specified engine\n");
+#endif
+ BIO_printf(bio_err," -rand file%cfile%c...\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
+ BIO_printf(bio_err," -sess_out arg - file to write SSL session to\n");
+ BIO_printf(bio_err," -sess_in arg - file to read SSL session from\n");
+#ifndef OPENSSL_NO_TLSEXT
+ BIO_printf(bio_err," -servername host - Set TLS extension servername in ClientHello\n");
+ BIO_printf(bio_err," -tlsextdebug - hex dump of all TLS extensions received\n");
+ BIO_printf(bio_err," -status - request certificate status from server\n");
+ BIO_printf(bio_err," -no_ticket - disable use of RFC4507bis session tickets\n");
+ BIO_printf(bio_err," -serverinfo types - send empty ClientHello extensions (comma-separated numbers)\n");
+ BIO_printf(bio_err," -auth - send and receive RFC 5878 TLS auth extensions and supplemental data\n");
+ BIO_printf(bio_err," -auth_require_reneg - Do not send TLS auth extensions until renegotiation\n");
+# ifndef OPENSSL_NO_NEXTPROTONEG
+ BIO_printf(bio_err," -nextprotoneg arg - enable NPN extension, considering named protocols supported (comma-separated list)\n");
+# endif
+ BIO_printf(bio_err," -alpn arg - enable ALPN extension, considering named protocols supported (comma-separated list)\n");
+#endif
+ BIO_printf(bio_err," -legacy_renegotiation - enable use of legacy renegotiation (dangerous)\n");
+ BIO_printf(bio_err," -use_srtp profiles - Offer SRTP key management with a colon-separated profile list\n");
+ BIO_printf(bio_err," -keymatexport label - Export keying material using label\n");
+ BIO_printf(bio_err," -keymatexportlen len - Export len bytes of keying material (default 20)\n");
+ }
+
+#ifndef OPENSSL_NO_TLSEXT
+
+/* This is a context that we pass to callbacks */
+typedef struct tlsextctx_st {
+ BIO * biodebug;
+ int ack;
+} tlsextctx;
+
+
+static int MS_CALLBACK ssl_servername_cb(SSL *s, int *ad, void *arg)
+ {
+ tlsextctx * p = (tlsextctx *) arg;
+ const char * hn= SSL_get_servername(s, TLSEXT_NAMETYPE_host_name);
+ if (SSL_get_servername_type(s) != -1)
+ p->ack = !SSL_session_reused(s) && hn != NULL;
+ else
+ BIO_printf(bio_err,"Can't use SSL_get_servername\n");
+
+ return SSL_TLSEXT_ERR_OK;
+ }
+
+#ifndef OPENSSL_NO_SRP
+
+/* This is a context that we pass to all callbacks */
+typedef struct srp_arg_st
+ {
+ char *srppassin;
+ char *srplogin;
+ int msg; /* copy from c_msg */
+ int debug; /* copy from c_debug */
+ int amp; /* allow more groups */
+ int strength /* minimal size for N */ ;
+ } SRP_ARG;
+
+#define SRP_NUMBER_ITERATIONS_FOR_PRIME 64
+
+static int srp_Verify_N_and_g(const BIGNUM *N, const BIGNUM *g)
+ {
+ BN_CTX *bn_ctx = BN_CTX_new();
+ BIGNUM *p = BN_new();
+ BIGNUM *r = BN_new();
+ int ret =
+ g != NULL && N != NULL && bn_ctx != NULL && BN_is_odd(N) &&
+ BN_is_prime_ex(N, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) &&
+ p != NULL && BN_rshift1(p, N) &&
+
+ /* p = (N-1)/2 */
+ BN_is_prime_ex(p, SRP_NUMBER_ITERATIONS_FOR_PRIME, bn_ctx, NULL) &&
+ r != NULL &&
+
+ /* verify g^((N-1)/2) == -1 (mod N) */
+ BN_mod_exp(r, g, p, N, bn_ctx) &&
+ BN_add_word(r, 1) &&
+ BN_cmp(r, N) == 0;
+
+ if(r)
+ BN_free(r);
+ if(p)
+ BN_free(p);
+ if(bn_ctx)
+ BN_CTX_free(bn_ctx);
+ return ret;
+ }
+
+/* This callback is used here for two purposes:
+ - extended debugging
+ - making some primality tests for unknown groups
+ The callback is only called for a non default group.
+
+ An application does not need the call back at all if
+ only the stanard groups are used. In real life situations,
+ client and server already share well known groups,
+ thus there is no need to verify them.
+ Furthermore, in case that a server actually proposes a group that
+ is not one of those defined in RFC 5054, it is more appropriate
+ to add the group to a static list and then compare since
+ primality tests are rather cpu consuming.
+*/
+
+static int MS_CALLBACK ssl_srp_verify_param_cb(SSL *s, void *arg)
+ {
+ SRP_ARG *srp_arg = (SRP_ARG *)arg;
+ BIGNUM *N = NULL, *g = NULL;
+ if (!(N = SSL_get_srp_N(s)) || !(g = SSL_get_srp_g(s)))
+ return 0;
+ if (srp_arg->debug || srp_arg->msg || srp_arg->amp == 1)
+ {
+ BIO_printf(bio_err, "SRP parameters:\n");
+ BIO_printf(bio_err,"\tN="); BN_print(bio_err,N);
+ BIO_printf(bio_err,"\n\tg="); BN_print(bio_err,g);
+ BIO_printf(bio_err,"\n");
+ }
+
+ if (SRP_check_known_gN_param(g,N))
+ return 1;
+
+ if (srp_arg->amp == 1)
+ {
+ if (srp_arg->debug)
+ BIO_printf(bio_err, "SRP param N and g are not known params, going to check deeper.\n");
+
+/* The srp_moregroups is a real debugging feature.
+ Implementors should rather add the value to the known ones.
+ The minimal size has already been tested.
+*/
+ if (BN_num_bits(g) <= BN_BITS && srp_Verify_N_and_g(N,g))
+ return 1;
+ }
+ BIO_printf(bio_err, "SRP param N and g rejected.\n");
+ return 0;
+ }
+
+#define PWD_STRLEN 1024
+
+static char * MS_CALLBACK ssl_give_srp_client_pwd_cb(SSL *s, void *arg)
+ {
+ SRP_ARG *srp_arg = (SRP_ARG *)arg;
+ char *pass = (char *)OPENSSL_malloc(PWD_STRLEN+1);
+ PW_CB_DATA cb_tmp;
+ int l;
+
+ cb_tmp.password = (char *)srp_arg->srppassin;
+ cb_tmp.prompt_info = "SRP user";
+ if ((l = password_callback(pass, PWD_STRLEN, 0, &cb_tmp))<0)
+ {
+ BIO_printf (bio_err, "Can't read Password\n");
+ OPENSSL_free(pass);
+ return NULL;
+ }
+ *(pass+l)= '\0';