172 lines
6.1 KiB
C
172 lines
6.1 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE libopusfile SOURCE CODE IS (C) COPYRIGHT 2013 *
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* by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
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* *
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********************************************************************/
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/*This should really be part of OpenSSL, but there's been a patch [1] sitting
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in their bugtracker for over two years that implements this, without any
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action, so I'm giving up and re-implementing it locally.
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[1] <http://rt.openssl.org/Ticket/Display.html?id=2158>*/
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#ifdef OPUS_ENABLED
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#include "opus/opus_config.h"
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#endif
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#include "opus/internal.h"
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#if defined(OP_ENABLE_HTTP)&&defined(_WIN32)
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/*You must include windows.h before wincrypt.h and x509.h.*/
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# define WIN32_LEAN_AND_MEAN
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# define WIN32_EXTRA_LEAN
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# include <windows.h>
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/*You must include wincrypt.h before x509.h, too, or X509_NAME doesn't get
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defined properly.*/
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# include <wincrypt.h>
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# include <openssl/ssl.h>
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# include <openssl/err.h>
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# include <openssl/x509.h>
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static int op_capi_new(X509_LOOKUP *_lu){
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HCERTSTORE h_store;
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h_store=CertOpenStore(CERT_STORE_PROV_SYSTEM_A,0,0,
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CERT_STORE_OPEN_EXISTING_FLAG|CERT_STORE_READONLY_FLAG|
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CERT_SYSTEM_STORE_CURRENT_USER|CERT_STORE_SHARE_CONTEXT_FLAG,"ROOT");
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if(h_store!=NULL){
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_lu->method_data=(char *)h_store;
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return 1;
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}
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return 0;
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}
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static void op_capi_free(X509_LOOKUP *_lu){
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HCERTSTORE h_store;
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h_store=(HCERTSTORE)_lu->method_data;
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# if defined(OP_ENABLE_ASSERTIONS)
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OP_ALWAYS_TRUE(CertCloseStore(h_store,CERT_CLOSE_STORE_CHECK_FLAG));
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# else
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CertCloseStore(h_store,0);
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# endif
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}
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static int op_capi_retrieve_by_subject(X509_LOOKUP *_lu,int _type,
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X509_NAME *_name,X509_OBJECT *_ret){
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X509_OBJECT *obj;
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CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
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obj=X509_OBJECT_retrieve_by_subject(_lu->store_ctx->objs,_type,_name);
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CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
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if(obj!=NULL){
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_ret->type=obj->type;
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memcpy(&_ret->data,&obj->data,sizeof(_ret->data));
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return 1;
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}
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return 0;
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}
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static int op_capi_get_by_subject(X509_LOOKUP *_lu,int _type,X509_NAME *_name,
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X509_OBJECT *_ret){
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HCERTSTORE h_store;
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if(_name==NULL)return 0;
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if(_name->bytes==NULL||_name->bytes->length<=0||_name->modified){
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if(i2d_X509_NAME(_name,NULL)<0)return 0;
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OP_ASSERT(_name->bytes->length>0);
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}
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h_store=(HCERTSTORE)_lu->method_data;
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switch(_type){
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case X509_LU_X509:{
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CERT_NAME_BLOB find_para;
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PCCERT_CONTEXT cert;
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X509 *x;
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int ret;
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/*Although X509_NAME contains a canon_enc field, that "canonical" [1]
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encoding was just made up by OpenSSL.
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It doesn't correspond to any actual standard, and since it drops the
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initial sequence header, won't be recognized by the Crypto API.
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The assumption here is that CertFindCertificateInStore() will allow any
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appropriate variations in the encoding when it does its comparison.
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This is, however, emphatically not true under Wine, which just compares
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the encodings with memcmp().
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Most of the time things work anyway, though, and there isn't really
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anything we can do to make the situation better.
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[1] A "canonical form" is defined as the one where, if you locked 10
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mathematicians in a room and asked them to come up with a
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representation for something, it's the answer that 9 of them would
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give you back.
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I don't think OpenSSL's encoding qualifies.*/
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find_para.cbData=_name->bytes->length;
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find_para.pbData=(unsigned char *)_name->bytes->data;
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cert=CertFindCertificateInStore(h_store,X509_ASN_ENCODING,0,
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CERT_FIND_SUBJECT_NAME,&find_para,NULL);
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if(cert==NULL)return 0;
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x=d2i_X509(NULL,(const unsigned char **)&cert->pbCertEncoded,
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cert->cbCertEncoded);
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CertFreeCertificateContext(cert);
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if(x==NULL)return 0;
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ret=X509_STORE_add_cert(_lu->store_ctx,x);
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X509_free(x);
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if(ret)return op_capi_retrieve_by_subject(_lu,_type,_name,_ret);
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}break;
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case X509_LU_CRL:{
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CERT_INFO cert_info;
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CERT_CONTEXT find_para;
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PCCRL_CONTEXT crl;
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X509_CRL *x;
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int ret;
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ret=op_capi_retrieve_by_subject(_lu,_type,_name,_ret);
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if(ret>0)return ret;
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memset(&cert_info,0,sizeof(cert_info));
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cert_info.Issuer.cbData=_name->bytes->length;
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cert_info.Issuer.pbData=(unsigned char *)_name->bytes->data;
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memset(&find_para,0,sizeof(find_para));
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find_para.pCertInfo=&cert_info;
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crl=CertFindCRLInStore(h_store,0,0,CRL_FIND_ISSUED_BY,&find_para,NULL);
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if(crl==NULL)return 0;
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x=d2i_X509_CRL(NULL,(const unsigned char **)&crl->pbCrlEncoded,
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crl->cbCrlEncoded);
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CertFreeCRLContext(crl);
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if(x==NULL)return 0;
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ret=X509_STORE_add_crl(_lu->store_ctx,x);
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X509_CRL_free(x);
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if(ret)return op_capi_retrieve_by_subject(_lu,_type,_name,_ret);
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}break;
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}
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return 0;
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}
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/*This is not const because OpenSSL doesn't allow it, even though it won't
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write to it.*/
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static X509_LOOKUP_METHOD X509_LOOKUP_CAPI={
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"Load Crypto API store into cache",
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op_capi_new,
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op_capi_free,
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NULL,
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NULL,
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NULL,
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op_capi_get_by_subject,
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NULL,
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NULL,
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NULL
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};
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int SSL_CTX_set_default_verify_paths_win32(SSL_CTX *_ssl_ctx){
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X509_STORE *store;
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X509_LOOKUP *lu;
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/*We intentionally do not add the normal default paths, as they are usually
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wrong, and are just asking to be used as an exploit vector.*/
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store=SSL_CTX_get_cert_store(_ssl_ctx);
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OP_ASSERT(store!=NULL);
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lu=X509_STORE_add_lookup(store,&X509_LOOKUP_CAPI);
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if(lu==NULL)return 0;
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ERR_clear_error();
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return 1;
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}
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#endif
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