diff options
Diffstat (limited to 'src/ssl/d1_srtp.c')
| -rw-r--r-- | src/ssl/d1_srtp.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/src/ssl/d1_srtp.c b/src/ssl/d1_srtp.c new file mode 100644 index 0000000..b85ff9b --- /dev/null +++ b/src/ssl/d1_srtp.c @@ -0,0 +1,431 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ +/* + DTLS code by Eric Rescorla <ekr@rtfm.com> + + Copyright (C) 2006, Network Resonance, Inc. + Copyright (C) 2011, RTFM, Inc. +*/ + +#include <stdio.h> + +#include <openssl/bytestring.h> +#include <openssl/obj.h> +#include <openssl/err.h> + +#include "ssl_locl.h" +#include <openssl/srtp.h> + + +static const 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, + }, + {0}, +}; + +static int find_profile_by_name(const char *profile_name, + const SRTP_PROTECTION_PROFILE **pptr, + size_t len) { + const SRTP_PROTECTION_PROFILE *p; + + p = srtp_known_profiles; + while (p->name) { + if (len == strlen(p->name) && !strncmp(p->name, profile_name, len)) { + *pptr = p; + return 1; + } + + p++; + } + + return 0; +} + +static int find_profile_by_num(unsigned profile_num, + const SRTP_PROTECTION_PROFILE **pptr) { + const SRTP_PROTECTION_PROFILE *p; + + p = srtp_known_profiles; + while (p->name) { + if (p->id == profile_num) { + *pptr = p; + return 1; + } + p++; + } + + return 0; +} + +static int ssl_ctx_make_profiles(const char *profiles_string, + STACK_OF(SRTP_PROTECTION_PROFILE) * *out) { + STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; + + const char *col; + const char *ptr = profiles_string; + + profiles = sk_SRTP_PROTECTION_PROFILE_new_null(); + if (profiles == NULL) { + OPENSSL_PUT_ERROR(SSL, ssl_ctx_make_profiles, + SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); + return 0; + } + + do { + const SRTP_PROTECTION_PROFILE *p; + + col = strchr(ptr, ':'); + if (find_profile_by_name(ptr, &p, col ? col - ptr : strlen(ptr))) { + sk_SRTP_PROTECTION_PROFILE_push(profiles, p); + } else { + OPENSSL_PUT_ERROR(SSL, ssl_ctx_make_profiles, + SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); + return 0; + } + + if (col) { + ptr = col + 1; + } + } while (col); + + *out = profiles; + + return 1; +} + +int SSL_CTX_set_srtp_profiles(SSL_CTX *ctx, const char *profiles) { + return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles); +} + +int SSL_set_srtp_profiles(SSL *s, const char *profiles) { + return ssl_ctx_make_profiles(profiles, &s->srtp_profiles); +} + +STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) { + if (s == NULL) { + return NULL; + } + + if (s->srtp_profiles != NULL) { + return s->srtp_profiles; + } + + if (s->ctx != NULL && s->ctx->srtp_profiles != NULL) { + return s->ctx->srtp_profiles; + } + + return NULL; +} + +const SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) { + return s->srtp_profile; +} + +int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) { + /* This API inverts its return value. */ + return !SSL_CTX_set_srtp_profiles(ctx, profiles); +} + +int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles) { + /* This API inverts its return value. */ + return !SSL_set_srtp_profiles(s, profiles); +} + +/* Note: this function returns 0 length if there are no profiles specified */ +int ssl_add_clienthello_use_srtp_ext(SSL *s, uint8_t *p, int *len, int maxlen) { + int ct = 0; + int i; + STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0; + const SRTP_PROTECTION_PROFILE *prof; + + clnt = SSL_get_srtp_profiles(s); + ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ + + if (p) { + if (ct == 0) { + OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_use_srtp_ext, + SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); + return 0; + } + + if (2 + ct * 2 + 1 > maxlen) { + OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_use_srtp_ext, + SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); + return 0; + } + + /* Add the length */ + s2n(ct * 2, p); + for (i = 0; i < ct; i++) { + prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); + s2n(prof->id, p); + } + + /* Add an empty use_mki value */ + *p++ = 0; + } + + *len = 2 + ct * 2 + 1; + + return 1; +} + +int ssl_parse_clienthello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert) { + CBS profile_ids, srtp_mki; + const SRTP_PROTECTION_PROFILE *cprof, *sprof; + STACK_OF(SRTP_PROTECTION_PROFILE) *client_profiles = 0, *server_profiles; + size_t i, j; + int ret = 0; + + if (!CBS_get_u16_length_prefixed(cbs, &profile_ids) || + CBS_len(&profile_ids) < 2 || + !CBS_get_u8_length_prefixed(cbs, &srtp_mki) || + CBS_len(cbs) != 0) { + OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_use_srtp_ext, + SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *out_alert = SSL_AD_DECODE_ERROR; + goto done; + } + + client_profiles = sk_SRTP_PROTECTION_PROFILE_new_null(); + if (client_profiles == NULL) { + OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_use_srtp_ext, + ERR_R_MALLOC_FAILURE); + *out_alert = SSL_AD_INTERNAL_ERROR; + goto done; + } + + while (CBS_len(&profile_ids) > 0) { + uint16_t profile_id; + + if (!CBS_get_u16(&profile_ids, &profile_id)) { + *out_alert = SSL_AD_DECODE_ERROR; + goto done; + } + + if (find_profile_by_num(profile_id, &cprof)) { + sk_SRTP_PROTECTION_PROFILE_push(client_profiles, cprof); + } + } + + /* Discard the MKI value for now. */ + + server_profiles = SSL_get_srtp_profiles(s); + + /* Pick the server's most preferred profile. */ + for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(server_profiles); i++) { + sprof = sk_SRTP_PROTECTION_PROFILE_value(server_profiles, i); + + for (j = 0; j < sk_SRTP_PROTECTION_PROFILE_num(client_profiles); j++) { + cprof = sk_SRTP_PROTECTION_PROFILE_value(client_profiles, j); + + if (cprof->id == sprof->id) { + s->srtp_profile = sprof; + ret = 1; + goto done; + } + } + } + + ret = 1; + +done: + if (client_profiles) { + sk_SRTP_PROTECTION_PROFILE_free(client_profiles); + } + + return ret; +} + +int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, + int maxlen) { + if (p) { + if (maxlen < 5) { + OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_use_srtp_ext, + SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); + return 0; + } + + if (s->srtp_profile == 0) { + OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_use_srtp_ext, + SSL_R_USE_SRTP_NOT_NEGOTIATED); + return 0; + } + + s2n(2, p); + s2n(s->srtp_profile->id, p); + *p++ = 0; + } + + *len = 5; + + return 1; +} + +int ssl_parse_serverhello_use_srtp_ext(SSL *s, CBS *cbs, int *out_alert) { + CBS profile_ids, srtp_mki; + uint16_t profile_id; + size_t i; + + STACK_OF(SRTP_PROTECTION_PROFILE) *client_profiles; + const SRTP_PROTECTION_PROFILE *prof; + + /* The extension consists of a u16-prefixed profile ID list containing a + * single uint16_t profile ID, then followed by a u8-prefixed srtp_mki field. + * + * See https://tools.ietf.org/html/rfc5764#section-4.1.1 */ + if (!CBS_get_u16_length_prefixed(cbs, &profile_ids) || + !CBS_get_u16(&profile_ids, &profile_id) || CBS_len(&profile_ids) != 0 || + !CBS_get_u8_length_prefixed(cbs, &srtp_mki) || CBS_len(cbs) != 0) { + OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext, + SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *out_alert = SSL_AD_DECODE_ERROR; + return 0; + } + + if (CBS_len(&srtp_mki) != 0) { + /* Must be no MKI, since we never offer one. */ + OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext, + SSL_R_BAD_SRTP_MKI_VALUE); + *out_alert = SSL_AD_ILLEGAL_PARAMETER; + return 0; + } + + client_profiles = SSL_get_srtp_profiles(s); + + /* Throw an error if the server gave us an unsolicited extension */ + if (client_profiles == NULL) { + OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext, + SSL_R_NO_SRTP_PROFILES); + *out_alert = SSL_AD_DECODE_ERROR; + return 0; + } + + /* Check to see if the server gave us something we support + (and presumably offered). */ + for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(client_profiles); i++) { + prof = sk_SRTP_PROTECTION_PROFILE_value(client_profiles, i); + + if (prof->id == profile_id) { + s->srtp_profile = prof; + *out_alert = 0; + return 1; + } + } + + OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_use_srtp_ext, + SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *out_alert = SSL_AD_ILLEGAL_PARAMETER; + return 0; +} |