| /* ssl/t1_lib.c */ |
| /* 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/objects.h> |
| #include "ssl_locl.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, |
| }, |
| {0} |
| }; |
| |
| static int find_profile_by_name(char *profile_name, |
| SRTP_PROTECTION_PROFILE **pptr, unsigned 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) { |
| SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, |
| SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); |
| return 1; |
| } |
| |
| do { |
| col = strchr(ptr, ':'); |
| |
| if (!find_profile_by_name(ptr, &p, |
| col ? col - ptr : (int)strlen(ptr))) { |
| if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) { |
| SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| sk_SRTP_PROTECTION_PROFILE_free(profiles); |
| return 1; |
| } |
| |
| sk_SRTP_PROTECTION_PROFILE_push(profiles, p); |
| } else { |
| SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, |
| SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); |
| sk_SRTP_PROTECTION_PROFILE_free(profiles); |
| return 1; |
| } |
| |
| if (col) |
| ptr = col + 1; |
| } while (col); |
| |
| *out = profiles; |
| |
| return 0; |
| } |
| |
| 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) |
| { |
| return ssl_ctx_make_profiles(profiles, &s->srtp_profiles); |
| } |
| |
| STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) |
| { |
| if (s != NULL) { |
| if (s->srtp_profiles != NULL) { |
| return s->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) |
| { |
| return s->srtp_profile; |
| } |
| |
| /* |
| * Note: this function returns 0 length if there are no profiles specified |
| */ |
| int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, |
| int maxlen) |
| { |
| int ct = 0; |
| int i; |
| STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0; |
| 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) { |
| SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); |
| return 1; |
| } |
| |
| if ((2 + ct * 2 + 1) > maxlen) { |
| SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); |
| return 1; |
| } |
| |
| /* 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 0; |
| } |
| |
| int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al) |
| { |
| SRTP_PROTECTION_PROFILE *sprof; |
| STACK_OF(SRTP_PROTECTION_PROFILE) *srvr; |
| unsigned int ct, mki_len, id; |
| int i, srtp_pref; |
| PACKET subpkt; |
| |
| /* Pull off the length of the cipher suite list and check it is even */ |
| if (!PACKET_get_net_2(pkt, &ct) |
| || (ct & 1) != 0 |
| || !PACKET_get_sub_packet(pkt, &subpkt, ct)) { |
| SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| srvr = SSL_get_srtp_profiles(s); |
| s->srtp_profile = NULL; |
| /* Search all profiles for a match initially */ |
| srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr); |
| |
| while (PACKET_remaining(&subpkt)) { |
| if (!PACKET_get_net_2(&subpkt, &id)) { |
| SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| /* |
| * Only look for match in profiles of higher preference than |
| * current match. |
| * If no profiles have been have been configured then this |
| * does nothing. |
| */ |
| for (i = 0; i < srtp_pref; i++) { |
| sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i); |
| if (sprof->id == id) { |
| s->srtp_profile = sprof; |
| srtp_pref = i; |
| break; |
| } |
| } |
| } |
| |
| /* |
| * Now extract the MKI value as a sanity check, but discard it for now |
| */ |
| if (!PACKET_get_1(pkt, &mki_len)) { |
| SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| if (!PACKET_forward(pkt, mki_len) |
| || PACKET_remaining(pkt)) { |
| SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_MKI_VALUE); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, |
| int maxlen) |
| { |
| if (p) { |
| if (maxlen < 5) { |
| SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); |
| return 1; |
| } |
| |
| if (s->srtp_profile == 0) { |
| SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_USE_SRTP_NOT_NEGOTIATED); |
| return 1; |
| } |
| s2n(2, p); |
| s2n(s->srtp_profile->id, p); |
| *p++ = 0; |
| } |
| *len = 5; |
| |
| return 0; |
| } |
| |
| int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al) |
| { |
| unsigned int id, ct, mki; |
| int i; |
| |
| STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; |
| SRTP_PROTECTION_PROFILE *prof; |
| |
| if (!PACKET_get_net_2(pkt, &ct) |
| || ct != 2 |
| || !PACKET_get_net_2(pkt, &id) |
| || !PACKET_get_1(pkt, &mki) |
| || PACKET_remaining(pkt) != 0) { |
| SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| if (mki != 0) { |
| /* Must be no MKI, since we never offer one */ |
| SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_MKI_VALUE); |
| *al = SSL_AD_ILLEGAL_PARAMETER; |
| return 1; |
| } |
| |
| clnt = SSL_get_srtp_profiles(s); |
| |
| /* Throw an error if the server gave us an unsolicited extension */ |
| if (clnt == NULL) { |
| SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_NO_SRTP_PROFILES); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| /* |
| * Check to see if the server gave us something we support (and |
| * presumably offered) |
| */ |
| for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) { |
| prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); |
| |
| if (prof->id == id) { |
| s->srtp_profile = prof; |
| *al = 0; |
| return 0; |
| } |
| } |
| |
| SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
| SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); |
| *al = SSL_AD_DECODE_ERROR; |
| return 1; |
| } |
| |
| #endif |
