+ /* This is an ugly hack that does a lot of assumptions */
+ /* We do have to handle multi-line responses which may come
+ in a single packet or not. We therefore have to use
+ BIO_gets() which does need a buffering BIO. So during
+ the initial chitchat we do push a buffering BIO into the
+ chain that is removed again later on to not disturb the
+ rest of the s_client operation. */
+ if (starttls_proto == PROTO_SMTP)
+ {
+ int foundit=0;
+ BIO *fbio = BIO_new(BIO_f_buffer());
+ BIO_push(fbio, sbio);
+ /* wait for multi-line response to end from SMTP */
+ do
+ {
+ mbuf_len = BIO_gets(fbio,mbuf,BUFSIZZ);
+ }
+ while (mbuf_len>3 && mbuf[3]=='-');
+ /* STARTTLS command requires EHLO... */
+ BIO_printf(fbio,"EHLO openssl.client.net\r\n");
+ (void)BIO_flush(fbio);
+ /* wait for multi-line response to end EHLO SMTP response */
+ do
+ {
+ mbuf_len = BIO_gets(fbio,mbuf,BUFSIZZ);
+ if (strstr(mbuf,"STARTTLS"))
+ foundit=1;
+ }
+ while (mbuf_len>3 && mbuf[3]=='-');
+ (void)BIO_flush(fbio);
+ BIO_pop(fbio);
+ BIO_free(fbio);
+ if (!foundit)
+ BIO_printf(bio_err,
+ "didn't found starttls in server response,"
+ " try anyway...\n");
+ BIO_printf(sbio,"STARTTLS\r\n");
+ BIO_read(sbio,sbuf,BUFSIZZ);
+ }
+ else if (starttls_proto == PROTO_POP3)
+ {
+ BIO_read(sbio,mbuf,BUFSIZZ);
+ BIO_printf(sbio,"STLS\r\n");
+ BIO_read(sbio,sbuf,BUFSIZZ);
+ }
+ else if (starttls_proto == PROTO_IMAP)
+ {
+ int foundit=0;
+ BIO *fbio = BIO_new(BIO_f_buffer());
+ BIO_push(fbio, sbio);
+ BIO_gets(fbio,mbuf,BUFSIZZ);
+ /* STARTTLS command requires CAPABILITY... */
+ BIO_printf(fbio,". CAPABILITY\r\n");
+ (void)BIO_flush(fbio);
+ /* wait for multi-line CAPABILITY response */
+ do
+ {
+ mbuf_len = BIO_gets(fbio,mbuf,BUFSIZZ);
+ if (strstr(mbuf,"STARTTLS"))
+ foundit=1;
+ }
+ while (mbuf_len>3 && mbuf[0]!='.');
+ (void)BIO_flush(fbio);
+ BIO_pop(fbio);
+ BIO_free(fbio);
+ if (!foundit)
+ BIO_printf(bio_err,
+ "didn't found STARTTLS in server response,"
+ " try anyway...\n");
+ BIO_printf(sbio,". STARTTLS\r\n");
+ BIO_read(sbio,sbuf,BUFSIZZ);
+ }
+ else if (starttls_proto == PROTO_FTP)
+ {
+ BIO *fbio = BIO_new(BIO_f_buffer());
+ BIO_push(fbio, sbio);
+ /* wait for multi-line response to end from FTP */
+ do
+ {
+ mbuf_len = BIO_gets(fbio,mbuf,BUFSIZZ);
+ }
+ while (mbuf_len>3 && mbuf[3]=='-');
+ (void)BIO_flush(fbio);
+ BIO_pop(fbio);
+ BIO_free(fbio);
+ BIO_printf(sbio,"AUTH TLS\r\n");
+ BIO_read(sbio,sbuf,BUFSIZZ);
+ }
+