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/*
* Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DTLS code by Eric Rescorla <ekr@rtfm.com>
*
* Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc.
*/
#include <stdio.h>
#include <openssl/objects.h>
#include "ssl_local.h"
#ifndef OPENSSL_NO_SRTP
static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
{
"SRTP_AES128_CM_SHA1_80",
SRTP_AES128_CM_SHA1_80,
},
{
"SRTP_AES128_CM_SHA1_32",
SRTP_AES128_CM_SHA1_32,
},
{
"SRTP_AEAD_AES_128_GCM",
SRTP_AEAD_AES_128_GCM,
},
{
"SRTP_AEAD_AES_256_GCM",
SRTP_AEAD_AES_256_GCM,
},
{
"SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM",
SRTP_DOUBLE_AEAD_AES_128_GCM_AEAD_AES_128_GCM,
},
{
"SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM",
SRTP_DOUBLE_AEAD_AES_256_GCM_AEAD_AES_256_GCM,
},
{
"SRTP_ARIA_128_CTR_HMAC_SHA1_80",
SRTP_ARIA_128_CTR_HMAC_SHA1_80,
},
{
"SRTP_ARIA_128_CTR_HMAC_SHA1_32",
SRTP_ARIA_128_CTR_HMAC_SHA1_32,
},
{
"SRTP_ARIA_256_CTR_HMAC_SHA1_80",
SRTP_ARIA_256_CTR_HMAC_SHA1_80,
},
{
"SRTP_ARIA_256_CTR_HMAC_SHA1_32",
SRTP_ARIA_256_CTR_HMAC_SHA1_32,
},
{
"SRTP_AEAD_ARIA_128_GCM",
SRTP_AEAD_ARIA_128_GCM,
},
{
"SRTP_AEAD_ARIA_256_GCM",
SRTP_AEAD_ARIA_256_GCM,
},
{0}
};
static int find_profile_by_name(char *profile_name,
SRTP_PROTECTION_PROFILE **pptr, size_t len)
{
SRTP_PROTECTION_PROFILE *p;
p = srtp_known_profiles;
while (p->name) {
if ((len == strlen(p->name))
&& strncmp(p->name, profile_name, len) == 0) {
*pptr = p;
return 0;
}
p++;
}
return 1;
}
static int ssl_ctx_make_profiles(const char *profiles_string,
STACK_OF(SRTP_PROTECTION_PROFILE) **out)
{
STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
char *col;
char *ptr = (char *)profiles_string;
SRTP_PROTECTION_PROFILE *p;
if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) {
ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
return 1;
}
do {
col = strchr(ptr, ':');
if (!find_profile_by_name(ptr, &p, col ? (size_t)(col - ptr)
: strlen(ptr))) {
if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) {
ERR_raise(ERR_LIB_SSL, SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
goto err;
}
if (!sk_SRTP_PROTECTION_PROFILE_push(profiles, p)) {
ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
goto err;
}
} else {
ERR_raise(ERR_LIB_SSL, SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
goto err;
}
if (col)
ptr = col + 1;
} while (col);
sk_SRTP_PROTECTION_PROFILE_free(*out);
*out = profiles;
return 0;
err:
sk_SRTP_PROTECTION_PROFILE_free(profiles);
return 1;
}
int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
{
return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
}
int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
if (sc == NULL)
return 0;
return ssl_ctx_make_profiles(profiles, &sc->srtp_profiles);
}
STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
if (sc != NULL) {
if (sc->srtp_profiles != NULL) {
return sc->srtp_profiles;
} else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) {
return s->ctx->srtp_profiles;
}
}
return NULL;
}
SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s)
{
SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL_ONLY(s);
if (sc == NULL)
return 0;
return sc->srtp_profile;
}
#endif
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