diff options
Diffstat (limited to 'openssl/ssl/d1_srtp.c')
| -rw-r--r-- | openssl/ssl/d1_srtp.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/openssl/ssl/d1_srtp.c b/openssl/ssl/d1_srtp.c new file mode 100644 index 000000000..928935bd8 --- /dev/null +++ b/openssl/ssl/d1_srtp.c @@ -0,0 +1,493 @@ +/* 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. +*/ + +#ifndef OPENSSL_NO_SRTP + +#include <stdio.h> +#include <openssl/objects.h> +#include "ssl_locl.h" +#include "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 0; + } + + p++; + } + + return 1; + } + +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 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())) + { + 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))) + { + sk_SRTP_PROTECTION_PROFILE_push(profiles,p); + } + else + { + SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); + 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, unsigned char *d, int len,int *al) + { + SRTP_PROTECTION_PROFILE *cprof,*sprof; + STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0,*srvr; + int ct; + int mki_len; + int i,j; + int id; + int ret; + + /* Length value + the MKI length */ + if(len < 3) + { + SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + /* Pull off the length of the cipher suite list */ + n2s(d, ct); + len -= 2; + + /* Check that it is even */ + if(ct%2) + { + SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + /* Check that lengths are consistent */ + if(len < (ct + 1)) + { + SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + + clnt=sk_SRTP_PROTECTION_PROFILE_new_null(); + + while(ct) + { + n2s(d,id); + ct-=2; + len-=2; + + if(!find_profile_by_num(id,&cprof)) + { + sk_SRTP_PROTECTION_PROFILE_push(clnt,cprof); + } + else + { + ; /* Ignore */ + } + } + + /* Now extract the MKI value as a sanity check, but discard it for now */ + mki_len = *d; + d++; len--; + + if (mki_len != len) + { + SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + 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; + *al=0; + ret=0; + goto done; + } + } + } + + ret=0; + +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) + { + 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, unsigned char *d, int len,int *al) + { + unsigned id; + int i; + int ct; + + STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; + SRTP_PROTECTION_PROFILE *prof; + + if(len!=5) + { + SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + n2s(d, ct); + if(ct!=2) + { + SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); + *al=SSL_AD_DECODE_ERROR; + return 1; + } + + n2s(d,id); + if (*d) /* 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 |