2 /* ====================================================================
3 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
56 /* Custom extension utility functions */
60 #ifndef OPENSSL_NO_TLSEXT
62 /* Find a custom extension from the list */
64 static custom_ext_method *custom_ext_find(custom_ext_methods *exts,
65 unsigned short ext_type)
68 custom_ext_method *meth = exts->meths;
69 for (i = 0; i < exts->meths_count; i++, meth++)
71 if (ext_type == meth->ext_type)
77 /* pass received custom extension data to the application for parsing */
79 int custom_ext_parse(SSL *s, int server,
80 unsigned short ext_type,
81 const unsigned char *ext_data,
82 unsigned short ext_size,
85 custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
86 custom_ext_method *meth;
87 meth = custom_ext_find(exts, ext_type);
88 /* If not found or no parse function set, return success */
89 if (!meth || !meth->parse_cb)
92 return meth->parse_cb(s, ext_type, ext_data, ext_size, al, meth->arg);
95 /* request custom extension data from the application and add to the
99 int custom_ext_add(SSL *s, int server,
100 unsigned char **pret,
101 unsigned char *limit,
104 custom_ext_methods *exts = server ? &s->cert->srv_ext : &s->cert->cli_ext;
105 custom_ext_method *meth;
106 unsigned char *ret = *pret;
109 for (i = 0; i < exts->meths_count; i++)
111 const unsigned char *out = NULL;
112 unsigned short outlen = 0;
113 meth = exts->meths + i;
115 /* For servers no callback omits extension,
116 * For clients it sends empty extension.
118 if (server && !meth->add_cb)
123 cb_retval = meth->add_cb(s, meth->ext_type,
127 return 0; /* error */
129 continue; /* skip this extension */
131 if (4 > limit - ret || outlen > limit - ret - 4)
133 s2n(meth->ext_type, ret);
137 memcpy(ret, out, outlen);
145 /* Copy table of custom extensions */
147 int custom_exts_copy(custom_ext_methods *dst, const custom_ext_methods *src)
149 if (src->meths_count)
151 dst->meths = BUF_memdup(src->meths, sizeof(custom_ext_method) * src->meths_count);
152 if (dst->meths == NULL)
154 dst->meths_count = src->meths_count;
159 void custom_exts_free(custom_ext_methods *exts)
162 OPENSSL_free(exts->meths);
165 /* Set callbacks for a custom extension */
166 static int custom_ext_set(custom_ext_methods *exts,
167 unsigned short ext_type,
168 custom_ext_parse_cb parse_cb,
169 custom_ext_add_cb add_cb,
172 custom_ext_method *meth;
173 /* Search for duplicate */
174 if (custom_ext_find(exts, ext_type))
176 exts->meths = OPENSSL_realloc(exts->meths,
177 (exts->meths_count + 1) * sizeof(custom_ext_method));
181 exts->meths_count = 0;
185 meth = exts->meths + exts->meths_count;
186 meth->parse_cb = parse_cb;
187 meth->add_cb = add_cb;
188 meth->ext_type = ext_type;
194 /* Application level functions to add custom extension callbacks */
196 int SSL_CTX_set_custom_cli_ext(SSL_CTX *ctx, unsigned short ext_type,
197 custom_cli_ext_first_cb_fn fn1,
198 custom_cli_ext_second_cb_fn fn2, void *arg)
200 return custom_ext_set(&ctx->cert->cli_ext, ext_type, fn2, fn1, arg);
203 int SSL_CTX_set_custom_srv_ext(SSL_CTX *ctx, unsigned short ext_type,
204 custom_srv_ext_first_cb_fn fn1,
205 custom_srv_ext_second_cb_fn fn2, void *arg)
207 return custom_ext_set(&ctx->cert->srv_ext, ext_type, fn1, fn2, arg);