From 5f18bc589865e6cc07e47ba7412a4cfd208abd04 Mon Sep 17 00:00:00 2001 From: TJ Saunders Date: Wed, 23 Mar 2016 11:55:53 -0700 Subject: [PATCH] Issue #719: If no serverinfo extension is found in some cases, do not abort the handshake, but simply omit/skip that extension. Check for already-registered serverinfo callbacks during serverinfo registration. Update SSL_CTX_use_serverinfo() documentation to mention the need to reload the same serverinfo per certificate, for servers with multiple server certificates. Reviewed-by: Richard Levitte Reviewed-by: Rich Salz --- doc/ssl/SSL_CTX_use_serverinfo.pod | 8 ++++++++ ssl/ssl_rsa.c | 29 ++++++++++++++++++++++------- 2 files changed, 30 insertions(+), 7 deletions(-) diff --git a/doc/ssl/SSL_CTX_use_serverinfo.pod b/doc/ssl/SSL_CTX_use_serverinfo.pod index 318e052e2b..caeb28de76 100644 --- a/doc/ssl/SSL_CTX_use_serverinfo.pod +++ b/doc/ssl/SSL_CTX_use_serverinfo.pod @@ -30,6 +30,14 @@ must consist of a 2-byte Extension Type, a 2-byte length, and then length bytes of extension_data. Each PEM extension name must begin with the phrase "BEGIN SERVERINFO FOR ". +If more than one certificate (RSA/DSA) is installed using +SSL_CTX_use_certificate(), the serverinfo extension will be loaded into the +last certificate installed. If e.g. the last item was a RSA certificate, the +loaded serverinfo extension data will be loaded for that certificate. To +use the serverinfo extension for multiple certificates, +SSL_CTX_use_serverinfo() needs to be called multiple times, once B +each time a certificate is loaded. + =head1 NOTES =head1 RETURN VALUES diff --git a/ssl/ssl_rsa.c b/ssl/ssl_rsa.c index 00bf887fdb..34632bbe2d 100644 --- a/ssl/ssl_rsa.c +++ b/ssl/ssl_rsa.c @@ -831,7 +831,7 @@ static int serverinfo_srv_add_cb(SSL *s, unsigned int ext_type, return 0; /* No extension found, don't send extension */ return 1; /* Send extension */ } - return -1; /* No serverinfo data found, don't send + return 0; /* No serverinfo data found, don't send * extension */ } @@ -860,12 +860,27 @@ static int serverinfo_process_buffer(const unsigned char *serverinfo, /* Register callbacks for extensions */ ext_type = (serverinfo[0] << 8) + serverinfo[1]; - if (ctx && !SSL_CTX_add_server_custom_ext(ctx, ext_type, - serverinfo_srv_add_cb, - NULL, NULL, - serverinfo_srv_parse_cb, - NULL)) - return 0; + if (ctx) { + int have_ext_cbs = 0; + size_t i; + custom_ext_methods *exts = &ctx->cert->srv_ext; + custom_ext_method *meth = exts->meths; + + /* check for existing callbacks for this extension */ + for (i = 0; i < exts->meths_count; i++, meth++) { + if (ext_type == meth->ext_type) { + have_ext_cbs = 1; + break; + } + } + + if (!have_ext_cbs && !SSL_CTX_add_server_custom_ext(ctx, ext_type, + serverinfo_srv_add_cb, + NULL, NULL, + serverinfo_srv_parse_cb, + NULL)) + return 0; + } serverinfo += 2; serverinfo_length -= 2; -- 2.25.1