#include "ssl_locl.h"
-#ifndef OPENSSL_NO_TLSEXT
-
-/* Find a custom extension from the list */
+/* Find a custom extension from the list. */
static custom_ext_method *custom_ext_find(custom_ext_methods *exts,
- unsigned short ext_type)
- {
- size_t i;
- custom_ext_method *meth = exts->meths;
- for (i = 0; i < exts->meths_count; i++, meth++)
- {
- if (ext_type == meth->ext_type)
- return meth;
- }
- return NULL;
- }
-/* Initialise custom extensions flags to indicate neither sent nor
- * received.
+ unsigned int ext_type)
+{
+ size_t i;
+ custom_ext_method *meth = exts->meths;
+ for (i = 0; i < exts->meths_count; i++, meth++) {
+ if (ext_type == meth->ext_type)
+ return meth;
+ }
+ return NULL;
+}
+
+/*
+ * Initialise custom extensions flags to indicate neither sent nor received.
*/
void custom_ext_init(custom_ext_methods *exts)
- {
- size_t i;
- custom_ext_method *meth = exts->meths;
- for (i = 0; i < exts->meths_count; i++, meth++)
- meth->ext_flags = 0;
- }
-
-/* pass received custom extension data to the application for parsing */
+{
+ size_t i;
+ custom_ext_method *meth = exts->meths;
+ for (i = 0; i < exts->meths_count; i++, meth++)
+ meth->ext_flags = 0;
+}
+/* Pass received custom extension data to the application for parsing. */
int custom_ext_parse(SSL *s, int server,
- unsigned int ext_type,
- const unsigned char *ext_data,
- size_t ext_size,
- int *al)
- {
- custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
- custom_ext_method *meth;
- meth = custom_ext_find(exts, ext_type);
- /* If not found or no parse function set, return success */
- /* If not found return success */
- if (!meth)
- return 1;
- if (!server)
- {
- /* If it's ServerHello we can't have any extensions not
- * sent in ClientHello.
- */
- if (!(meth->ext_flags & SSL_EXT_FLAG_SENT))
- {
- *al = TLS1_AD_UNSUPPORTED_EXTENSION;
- return 0;
- }
- }
- /* If already present it's a duplicate */
- if (meth->ext_flags & SSL_EXT_FLAG_RECEIVED)
- {
- *al = TLS1_AD_DECODE_ERROR;
- return 0;
- }
- meth->ext_flags |= SSL_EXT_FLAG_RECEIVED;
- if (!meth->parse_cb)
- return 1;
+ unsigned int ext_type,
+ const unsigned char *ext_data, size_t ext_size, int *al)
+{
+ custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
+ custom_ext_method *meth;
+ meth = custom_ext_find(exts, ext_type);
+ /* If not found return success */
+ if (!meth)
+ return 1;
+ if (!server) {
+ /*
+ * If it's ServerHello we can't have any extensions not sent in
+ * ClientHello.
+ */
+ if (!(meth->ext_flags & SSL_EXT_FLAG_SENT)) {
+ *al = TLS1_AD_UNSUPPORTED_EXTENSION;
+ return 0;
+ }
+ }
+ /* If already present it's a duplicate */
+ if (meth->ext_flags & SSL_EXT_FLAG_RECEIVED) {
+ *al = TLS1_AD_DECODE_ERROR;
+ return 0;
+ }
+ meth->ext_flags |= SSL_EXT_FLAG_RECEIVED;
+ /* If no parse function set return success */
+ if (!meth->parse_cb)
+ return 1;
- return meth->parse_cb(s, ext_type, ext_data, ext_size, al, meth->parse_arg);
- }
+ return meth->parse_cb(s, ext_type, ext_data, ext_size, al,
+ meth->parse_arg);
+}
-/* request custom extension data from the application and add to the
- * return buffer
+/*
+ * Request custom extension data from the application and add to the return
+ * buffer.
*/
-
int custom_ext_add(SSL *s, int server,
- unsigned char **pret,
- unsigned char *limit,
- int *al)
- {
- custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
- custom_ext_method *meth;
- unsigned char *ret = *pret;
- size_t i;
+ unsigned char **pret, unsigned char *limit, int *al)
+{
+ custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
+ custom_ext_method *meth;
+ unsigned char *ret = *pret;
+ size_t i;
- for (i = 0; i < exts->meths_count; i++)
- {
- const unsigned char *out = NULL;
- size_t outlen = 0;
- meth = exts->meths + i;
+ for (i = 0; i < exts->meths_count; i++) {
+ const unsigned char *out = NULL;
+ size_t outlen = 0;
+ meth = exts->meths + i;
- if (server)
- {
- /* For ServerHello only send extensions present
- * in ClientHello.
- */
- if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED))
- continue;
- /* If callback absent for server skip it */
- if (!meth->add_cb)
- continue;
- }
- if (meth->add_cb)
- {
- int cb_retval = 0;
- cb_retval = meth->add_cb(s, meth->ext_type,
- &out, &outlen, al,
- meth->add_arg);
- if (cb_retval < 0)
- return 0; /* error */
- if (cb_retval == 0)
- continue; /* skip this extension */
- }
- if (4 > limit - ret || outlen > (size_t)(limit - ret - 4))
- return 0;
- s2n(meth->ext_type, ret);
- s2n(outlen, ret);
- if (outlen)
- {
- memcpy(ret, out, outlen);
- ret += outlen;
- }
- /* We can't send duplicates: code logic should prevent this */
- OPENSSL_assert(!(meth->ext_flags & SSL_EXT_FLAG_SENT));
- /* Indicate extension has been sent: this is both a sanity
- * check to ensure we don't send duplicate extensions
- * and indicates to servers that an extension can be
- * sent in ServerHello.
- */
- meth->ext_flags |= SSL_EXT_FLAG_SENT;
- if (meth->free_cb)
- meth->free_cb(s, meth->ext_type, out, meth->add_arg);
- }
- *pret = ret;
- return 1;
- }
+ if (server) {
+ /*
+ * For ServerHello only send extensions present in ClientHello.
+ */
+ if (!(meth->ext_flags & SSL_EXT_FLAG_RECEIVED))
+ continue;
+ /* If callback absent for server skip it */
+ if (!meth->add_cb)
+ continue;
+ }
+ if (meth->add_cb) {
+ int cb_retval = 0;
+ cb_retval = meth->add_cb(s, meth->ext_type,
+ &out, &outlen, al, meth->add_arg);
+ if (cb_retval < 0)
+ return 0; /* error */
+ if (cb_retval == 0)
+ continue; /* skip this extension */
+ }
+ if (4 > limit - ret || outlen > (size_t)(limit - ret - 4))
+ return 0;
+ s2n(meth->ext_type, ret);
+ s2n(outlen, ret);
+ if (outlen) {
+ memcpy(ret, out, outlen);
+ ret += outlen;
+ }
+ /*
+ * We can't send duplicates: code logic should prevent this.
+ */
+ OPENSSL_assert(!(meth->ext_flags & SSL_EXT_FLAG_SENT));
+ /*
+ * Indicate extension has been sent: this is both a sanity check to
+ * ensure we don't send duplicate extensions and indicates that it is
+ * not an error if the extension is present in ServerHello.
+ */
+ meth->ext_flags |= SSL_EXT_FLAG_SENT;
+ if (meth->free_cb)
+ meth->free_cb(s, meth->ext_type, out, meth->add_arg);
+ }
+ *pret = ret;
+ return 1;
+}
/* Copy table of custom extensions */
-
int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src)
- {
- if (src->meths_count)
- {
- dst->meths = BUF_memdup(src->meths, sizeof(custom_ext_method) * src->meths_count);
- if (dst->meths == NULL)
- return 0;
- dst->meths_count = src->meths_count;
- }
- return 1;
- }
+{
+ if (src->meths_count) {
+ dst->meths =
+ BUF_memdup(src->meths,
+ sizeof(custom_ext_method) * src->meths_count);
+ if (dst->meths == NULL)
+ return 0;
+ dst->meths_count = src->meths_count;
+ }
+ return 1;
+}
void custom_exts_free(custom_ext_methods *exts)
- {
- if (exts->meths)
- OPENSSL_free(exts->meths);
- }
+{
+ OPENSSL_free(exts->meths);
+}
-/* Set callbacks for a custom extension */
-static int custom_ext_set(custom_ext_methods *exts,
- unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
- {
- custom_ext_method *meth;
- /* See if it is a supported internally */
- switch(ext_type)
- {
- case TLSEXT_TYPE_application_layer_protocol_negotiation:
- case TLSEXT_TYPE_ec_point_formats:
- case TLSEXT_TYPE_elliptic_curves:
- case TLSEXT_TYPE_heartbeat:
- case TLSEXT_TYPE_next_proto_neg:
- case TLSEXT_TYPE_padding:
- case TLSEXT_TYPE_renegotiate:
- case TLSEXT_TYPE_server_name:
- case TLSEXT_TYPE_session_ticket:
- case TLSEXT_TYPE_signature_algorithms:
- case TLSEXT_TYPE_srp:
- case TLSEXT_TYPE_status_request:
- case TLSEXT_TYPE_use_srtp:
-#ifdef TLSEXT_TYPE_opaque_prf_input
- case TLSEXT_TYPE_opaque_prf_input:
-#endif
-#ifdef TLSEXT_TYPE_encrypt_then_mac
- case TLSEXT_TYPE_encrypt_then_mac:
-#endif
- return 0;
- }
- /* Extension type must fit in 16 bits */
- if (ext_type > 0xffff)
- return 0;
- /* Search for duplicate */
- if (custom_ext_find(exts, ext_type))
- return 0;
- exts->meths = OPENSSL_realloc(exts->meths,
- (exts->meths_count + 1) * sizeof(custom_ext_method));
+/* Set callbacks for a custom extension. */
+static int custom_ext_meth_add(custom_ext_methods *exts,
+ unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb, void *parse_arg)
+{
+ custom_ext_method *meth;
+ /*
+ * Check application error: if add_cb is not set free_cb will never be
+ * called.
+ */
+ if (!add_cb && free_cb)
+ return 0;
+ /* Don't add if extension supported internally. */
+ if (SSL_extension_supported(ext_type))
+ return 0;
+ /* Extension type must fit in 16 bits */
+ if (ext_type > 0xffff)
+ return 0;
+ /* Search for duplicate */
+ if (custom_ext_find(exts, ext_type))
+ return 0;
+ exts->meths = OPENSSL_realloc(exts->meths,
+ (exts->meths_count +
+ 1) * sizeof(custom_ext_method));
- if (!exts->meths)
- {
- exts->meths_count = 0;
- return 0;
- }
+ if (!exts->meths) {
+ exts->meths_count = 0;
+ return 0;
+ }
- meth = exts->meths + exts->meths_count;
- memset(meth, 0, sizeof(custom_ext_method));
- meth->parse_cb = parse_cb;
- meth->add_cb = add_cb;
- meth->free_cb = free_cb;
- meth->ext_type = ext_type;
- meth->add_arg = add_arg;
- meth->parse_arg = parse_arg;
- exts->meths_count++;
- return 1;
- }
+ meth = exts->meths + exts->meths_count;
+ memset(meth, 0, sizeof(*meth));
+ meth->parse_cb = parse_cb;
+ meth->add_cb = add_cb;
+ meth->free_cb = free_cb;
+ meth->ext_type = ext_type;
+ meth->add_arg = add_arg;
+ meth->parse_arg = parse_arg;
+ exts->meths_count++;
+ return 1;
+}
/* Application level functions to add custom extension callbacks */
+int SSL_CTX_add_client_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb,
+ void *parse_arg)
+{
+ return custom_ext_meth_add(&ctx->cert->cli_ext, ext_type,
+ add_cb, free_cb, add_arg, parse_cb, parse_arg);
+}
-int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
-
- {
- return custom_ext_set(&ctx->cert->cli_ext, ext_type,
- add_cb, free_cb, add_arg,
- parse_cb, parse_arg);
- }
+int SSL_CTX_add_server_custom_ext(SSL_CTX *ctx, unsigned int ext_type,
+ custom_ext_add_cb add_cb,
+ custom_ext_free_cb free_cb,
+ void *add_arg,
+ custom_ext_parse_cb parse_cb,
+ void *parse_arg)
+{
+ return custom_ext_meth_add(&ctx->cert->srv_ext, ext_type,
+ add_cb, free_cb, add_arg, parse_cb, parse_arg);
+}
-int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned int ext_type,
- custom_ext_add_cb add_cb,
- custom_ext_free_cb free_cb,
- void *add_arg,
- custom_ext_parse_cb parse_cb, void *parse_arg)
- {
- return custom_ext_set(&ctx->cert->srv_ext, ext_type,
- add_cb, free_cb, add_arg,
- parse_cb, parse_arg);
- }
+int SSL_extension_supported(unsigned int ext_type)
+{
+ switch (ext_type) {
+ /* Internally supported extensions. */
+ case TLSEXT_TYPE_application_layer_protocol_negotiation:
+ case TLSEXT_TYPE_ec_point_formats:
+ case TLSEXT_TYPE_elliptic_curves:
+ case TLSEXT_TYPE_heartbeat:
+ case TLSEXT_TYPE_next_proto_neg:
+ case TLSEXT_TYPE_padding:
+ case TLSEXT_TYPE_renegotiate:
+ case TLSEXT_TYPE_server_name:
+ case TLSEXT_TYPE_session_ticket:
+ case TLSEXT_TYPE_signature_algorithms:
+ case TLSEXT_TYPE_srp:
+ case TLSEXT_TYPE_status_request:
+ case TLSEXT_TYPE_use_srtp:
+#ifdef TLSEXT_TYPE_encrypt_then_mac
+ case TLSEXT_TYPE_encrypt_then_mac:
#endif
+ return 1;
+ default:
+ return 0;
+ }
+}
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