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fixed a few bugs in signature verification code accross versions

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This commit is contained in:
csoler 2017-11-22 22:56:40 +01:00
parent f6d69e09d5
commit 669f2ba7ba
2 changed files with 89 additions and 101 deletions
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189
libretroshare/src/pqi/authssl.cc
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@ -1031,17 +1031,15 @@ bool AuthSSLimpl::AuthX509WithGPG(X509 *x509,uint32_t& diagnostic)
X509_get0_signature(&signature,&algor2,x509);
#endif
#ifdef V07_NON_BACKWARD_COMPATIBLE_CHANGE_002
const EVP_MD *type = EVP_sha256();
#else
const EVP_MD *type = EVP_sha1();
#endif
uint32_t certificate_version = getX509RetroshareCertificateVersion(x509) ;
EVP_MD_CTX *ctx = EVP_MD_CTX_create();
int inl=0,hashoutl=0;
int inl=0;
int sigoutl=0;
const unsigned char *signed_data = NULL ;
uint32_t signed_data_length =0;
/* input buffer */
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
inl=i2d(data,NULL);
@ -1052,13 +1050,9 @@ bool AuthSSLimpl::AuthX509WithGPG(X509 *x509,uint32_t& diagnostic)
inl=i2d_re_X509_tbs(x509,&buf_in) ; // this does the i2d over x509->cert_info
#endif
hashoutl=EVP_MD_size(type);
unsigned char *buf_hashout=NULL ;
sigoutl=2048; //hashoutl; //EVP_PKEY_size(pkey);
unsigned char *buf_sigout=(unsigned char *)OPENSSL_malloc((unsigned int)sigoutl);
uint32_t certificate_version = getX509RetroshareCertificateVersion(x509) ;
#ifdef AUTHSSL_DEBUG
std::cerr << "Buffer Sizes: in: " << inl;
std::cerr << " HashOut: " << hashoutl;
@ -1068,7 +1062,6 @@ bool AuthSSLimpl::AuthX509WithGPG(X509 *x509,uint32_t& diagnostic)
if ((buf_in == NULL) || (buf_sigout == NULL))
{
hashoutl=0;
sigoutl=0;
fprintf(stderr, "AuthSSLimpl::AuthX509: ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE)\n");
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
@ -1083,137 +1076,134 @@ bool AuthSSLimpl::AuthX509WithGPG(X509 *x509,uint32_t& diagnostic)
p=buf_in;
i2d(data,&p);
#endif
{ // this is to avoid cross-initialization jumps to err.
if(certificate_version < RS_CERTIFICATE_VERSION_NUMBER_07_0001)
{
buf_hashout=(unsigned char *)OPENSSL_malloc((unsigned int)hashoutl);
const Sha1CheckSum sha1 = RsDirUtil::sha1sum(buf_in,inl) ; // olds the memory until destruction
if(buf_hashout == NULL)
if(certificate_version < RS_CERTIFICATE_VERSION_NUMBER_07_0001)
{
// const EVP_MD *type = EVP_sha1();
//
// int hashoutl=EVP_MD_size(type);
// unsigned char *buf_hashout = (unsigned char *)OPENSSL_malloc((unsigned int)hashoutl);
//
// if(buf_hashout == NULL)
// {
// hashoutl=0;
// sigoutl=0;
// fprintf(stderr, "AuthSSLimpl::AuthX509: ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE)\n");
// diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
// goto err;
// }
// /* data in buf_in, ready to be hashed */
// EVP_DigestInit_ex(ctx,type, NULL);
// EVP_DigestUpdate(ctx,(unsigned char *)buf_in,inl);
//
// if (!EVP_DigestFinal(ctx,(unsigned char *)buf_hashout, (unsigned int *)&hashoutl))
// {
// hashoutl=0;
// fprintf(stderr, "AuthSSLimpl::AuthX509: ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB)\n");
// diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
// goto err;
// }
signed_data = sha1.toByteArray() ;
signed_data_length = sha1.SIZE_IN_BYTES;
}
else
{
signed_data = buf_in ;
signed_data_length = inl ;
}
/* copy data into signature */
if(sigoutl < signature->length)
{
hashoutl=0;
sigoutl=0;
fprintf(stderr, "AuthSSLimpl::AuthX509: ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE)\n");
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
goto err;
}
/* data in buf_in, ready to be hashed */
EVP_DigestInit_ex(ctx,type, NULL);
EVP_DigestUpdate(ctx,(unsigned char *)buf_in,inl);
sigoutl = signature->length;
memmove(buf_sigout, signature->data, sigoutl);
if (!EVP_DigestFinal(ctx,(unsigned char *)buf_hashout, (unsigned int *)&hashoutl))
/* NOW check sign via GPG Functions */
//get the fingerprint of the key that is supposed to sign
#ifdef AUTHSSL_DEBUG
std::cerr << "AuthSSLimpl::AuthX509() verifying the gpg sig with keyprint : " << pd.fpr << std::endl;
std::cerr << "Sigoutl = " << sigoutl << std::endl ;
std::cerr << "pd.fpr = " << pd.fpr << std::endl ;
#endif
// Take a early look at signature parameters. In particular we dont accept signatures with unsecure hash algorithms.
PGPSignatureInfo signature_info ;
PGPKeyManagement::parseSignature(buf_sigout,sigoutl,signature_info) ;
if(signature_info.signature_version != PGP_PACKET_TAG_SIGNATURE_VERSION_V4)
{
hashoutl=0;
fprintf(stderr, "AuthSSLimpl::AuthX509: ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB)\n");
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
goto err;
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE_VERSION ;
return false ;
}
#ifdef AUTHSSL_DEBUG
std::cerr << "Digest Applied: len: " << hashoutl << std::endl;
#endif
}
std::string sigtypestring ;
/* copy data into signature */
if(sigoutl < signature->length)
{
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_MALLOC_ERROR ;
goto err;
}
sigoutl = signature->length;
memmove(buf_sigout, signature->data, sigoutl);
/* NOW check sign via GPG Functions */
//get the fingerprint of the key that is supposed to sign
#ifdef AUTHSSL_DEBUG
std::cerr << "AuthSSLimpl::AuthX509() verifying the gpg sig with keyprint : " << pd.fpr << std::endl;
std::cerr << "Sigoutl = " << sigoutl << std::endl ;
std::cerr << "pd.fpr = " << pd.fpr << std::endl ;
#ifndef V07_NON_BACKWARD_COMPATIBLE_CHANGE_003
std::cerr << "hashoutl = " << hashoutl << std::endl ;
#endif
#endif
// Take a early look at signature parameters. In particular we dont accept signatures with unsecure hash algorithms.
{
PGPSignatureInfo signature_info ;
PGPKeyManagement::parseSignature(buf_sigout,sigoutl,signature_info) ;
if(signature_info.signature_version != PGP_PACKET_TAG_SIGNATURE_VERSION_V4)
{
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE_VERSION ;
return false ;
}
std::string sigtypestring ;
switch(signature_info.signature_type)
{
switch(signature_info.signature_type)
{
case PGP_PACKET_TAG_SIGNATURE_TYPE_BINARY_DOCUMENT :
break ;
break ;
case PGP_PACKET_TAG_SIGNATURE_TYPE_STANDALONE_SIG :
case PGP_PACKET_TAG_SIGNATURE_TYPE_CANONICAL_TEXT :
case PGP_PACKET_TAG_SIGNATURE_TYPE_UNKNOWN :
default:
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE_TYPE ;
return false ;
}
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE_TYPE ;
return false ;
}
switch(signature_info.public_key_algorithm)
{
switch(signature_info.public_key_algorithm)
{
case PGP_PACKET_TAG_PUBLIC_KEY_ALGORITHM_RSA_ES :
case PGP_PACKET_TAG_PUBLIC_KEY_ALGORITHM_RSA_S : sigtypestring = "RSA" ;
break ;
break ;
case PGP_PACKET_TAG_PUBLIC_KEY_ALGORITHM_DSA : sigtypestring = "DSA" ;
break ;
break ;
case PGP_PACKET_TAG_PUBLIC_KEY_ALGORITHM_RSA_E :
case PGP_PACKET_TAG_PUBLIC_KEY_ALGORITHM_UNKNOWN:
default:
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_HASH_ALGORITHM_NOT_ACCEPTED ;
return false ;
}
default:
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_HASH_ALGORITHM_NOT_ACCEPTED ;
return false ;
}
switch(signature_info.hash_algorithm)
{
switch(signature_info.hash_algorithm)
{
case PGP_PACKET_TAG_HASH_ALGORITHM_SHA1 : sigtypestring += "+SHA1" ; break;
case PGP_PACKET_TAG_HASH_ALGORITHM_SHA256: sigtypestring += "+SHA256" ; break;
case PGP_PACKET_TAG_HASH_ALGORITHM_SHA512: sigtypestring += "+SHA512" ; break;
// We dont accept signatures with unknown or week hash algorithms.
// We dont accept signatures with unknown or week hash algorithms.
case PGP_PACKET_TAG_HASH_ALGORITHM_MD5:
case PGP_PACKET_TAG_HASH_ALGORITHM_UNKNOWN:
default:
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_HASH_ALGORITHM_NOT_ACCEPTED ;
return false ;
}
}
// passed, verify the signature itself
// passed, verify the signature itself
if(certificate_version < RS_CERTIFICATE_VERSION_NUMBER_07_0001)
{
if (!AuthGPG::getAuthGPG()->VerifySignBin(buf_hashout, hashoutl, buf_sigout, (unsigned int) sigoutl, pd.fpr))
if (!AuthGPG::getAuthGPG()->VerifySignBin(signed_data, signed_data_length, buf_sigout, (unsigned int) sigoutl, pd.fpr))
{
sigoutl = 0;
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE ;
goto err;
}
}
else if (!AuthGPG::getAuthGPG()->VerifySignBin(buf_in, inl, buf_sigout, (unsigned int) sigoutl, pd.fpr))
{
sigoutl = 0;
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_WRONG_SIGNATURE ;
goto err;
}
RsPeerId peerIdstr ;
getX509id(x509, peerIdstr) ;
RsPeerId peerIdstr ;
getX509id(x509, peerIdstr) ;
std::cerr << "Verified signature of type " << sigtypestring << " on certificate " << peerIdstr << " Version " << std::hex << certificate_version
<< std::dec << " using PGP key with fingerprint " << pd.fpr.toStdString() << std::endl;
std::cerr << "Verified signature of type " << sigtypestring << " on certificate " << peerIdstr << " Version " << std::hex << certificate_version
<< std::dec << " using PGP key with fingerprint " << pd.fpr.toStdString() << std::endl;
}
#ifdef AUTHSSL_DEBUG
@ -1222,7 +1212,6 @@ bool AuthSSLimpl::AuthX509WithGPG(X509 *x509,uint32_t& diagnostic)
EVP_MD_CTX_destroy(ctx) ;
OPENSSL_free(buf_in) ;
OPENSSL_free(buf_hashout) ;
OPENSSL_free(buf_sigout) ;
diagnostic = RS_SSL_HANDSHAKE_DIAGNOSTIC_OK ;
@ -1234,8 +1223,6 @@ err:
if(buf_in != NULL)
OPENSSL_free(buf_in) ;
if(buf_hashout != NULL)
OPENSSL_free(buf_hashout) ;
if(buf_sigout != NULL)
OPENSSL_free(buf_sigout) ;
return false;

1
retroshare.pri
View File

@ -297,6 +297,7 @@ rs_chatserver {
# Backward compat: patched peers cannot connect to non patched peers older than Nov 2017.
###########################################################################################################################################################
#CONFIG += rs_v07_changes
rs_v07_changes {
DEFINES += V07_NON_BACKWARD_COMPATIBLE_CHANGE_001
DEFINES += V07_NON_BACKWARD_COMPATIBLE_CHANGE_002