| /* 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 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, |
| }, |
| #if 0 |
| { |
| "SRTP_NULL_SHA1_80", |
| SRTP_NULL_SHA1_80, |
| }, |
| { |
| "SRTP_NULL_SHA1_32", |
| SRTP_NULL_SHA1_32, |
| }, |
| #endif |
| {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)) |
| { |
| *pptr=p; |
| return 1; |
| } |
| |
| p++; |
| } |
| |
| return 0; |
| } |
| |
| static int find_profile_by_num(unsigned profile_num, |
| SRTP_PROTECTION_PROFILE **pptr) |
| { |
| 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; |
| |
| char *col; |
| char *ptr=(char *)profiles_string; |
| |
| SRTP_PROTECTION_PROFILE *p; |
| |
| if(!(profiles=sk_SRTP_PROTECTION_PROFILE_new_null())) |
| { |
| OPENSSL_PUT_ERROR(SSL, ssl_ctx_make_profiles, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); |
| return 0; |
| } |
| |
| do |
| { |
| col=strchr(ptr,':'); |
| |
| if(find_profile_by_name(ptr,&p, |
| col ? col-ptr : (int)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) |
| { |
| 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; |
| } |
| |
| 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, 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) |
| { |
| 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; |
| SRTP_PROTECTION_PROFILE *cprof, *sprof; |
| STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0,*srvr; |
| 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; |
| } |
| |
| clnt = sk_SRTP_PROTECTION_PROFILE_new_null(); |
| |
| 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(clnt, cprof); |
| } |
| } |
| |
| /* Discard the MKI value for now. */ |
| |
| srvr = SSL_get_srtp_profiles(s); |
| |
| /* Pick our most preferred profile. If no profiles have been |
| configured then the outer loop doesn't run |
| (sk_SRTP_PROTECTION_PROFILE_num() = -1) |
| and so we just return without doing anything */ |
| for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(srvr);i++) |
| { |
| sprof=sk_SRTP_PROTECTION_PROFILE_value(srvr,i); |
| |
| for(j=0;j<sk_SRTP_PROTECTION_PROFILE_num(clnt);j++) |
| { |
| cprof=sk_SRTP_PROTECTION_PROFILE_value(clnt,j); |
| |
| if(cprof->id==sprof->id) |
| { |
| s->srtp_profile = sprof; |
| ret = 1; |
| goto done; |
| } |
| } |
| } |
| |
| ret = 1; |
| |
| done: |
| if(clnt) sk_SRTP_PROTECTION_PROFILE_free(clnt); |
| |
| 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) *clnt; |
| 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; |
| } |
| |
| clnt=SSL_get_srtp_profiles(s); |
| |
| /* Throw an error if the server gave us an unsolicited extension */ |
| if (clnt == 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(clnt);i++) |
| { |
| prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,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; |
| } |