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Enabled PFS for SSH connections, based on a 4096 bits safe prime. This is retro-compatible, meaning that old peers will connect to the new one using PFS if they act as a client (meaning they request the connection)

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git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6738 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
csoler 2013-09-14 12:28:45 +00:00
parent 45c0da0f0f
commit 4b44304aec
1 changed files with 58 additions and 7 deletions
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63
libretroshare/src/pqi/authssl.cc
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@ -325,11 +325,49 @@ static int initLib = 0;
// setup connection method
sslctx = SSL_CTX_new(TLSv1_method());
// setup cipher lists.
std::string cipherString = "HIGH:!DSS:!aNULL:!3DES";
//SSL_CTX_set_cipher_list(sslctx, "DEFAULT");
// Setup cipher lists:
//
// std::string cipherString = "HIGH:!DSS:!aNULL:!3DES";
// std::string cipherString = "DEFAULT";
//
// The current cipher list asks in priority for EDH which provides PFS. However EDH needs proper
// parameters to be set on the server side, so if we're a client for a RS instance that has no DH params,
// the connection will be refused. So we happend the HIGH cipher suite just after. In oder to force
// PFS, at the risk of not always connecting, one should use:
//
// std::string cipherString = "kEDH:!ECDHE:!DSS:!aNULL:!3DES";
//
// ECDHE has been removed from the list because of suspicions about the level of security in the
// generation of the elliptic curves parameters. The following safe primes are 2048/4096 bits long. Should be enough.
//
// std::string dh_prime_2048_dec = "30651576830996935311378276950670996791883170963804289256203421500259588715033040934547350194073369837229137842804826417332761673984632102152477971341551955103053338169949165519208562998954887445690136488713010579430413255432398961330773637820158790237012997356731669148258317860643591694814197514454546928317578771868379525705082166818553884557266645700906836702542808787791878865135741211056957383668479369231868698451684633965462539374994559481908068730787128654626819903401038534403722014687647173327537458614224702967073490136394698912372792187651228785689025073104374674728645661275001416541267543884923191810923";
//
std::string dh_prime_2048_hex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
std::string dh_prime_4096_hex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
std::string cipherString = "kEDH:HIGH:!ECDHE:!DSS:!aNULL:!3DES";
SSL_CTX_set_cipher_list(sslctx, cipherString.c_str());
DH* dh = DH_new();
int codes = 0;
bool pfs_enabled = true ;
if (dh)
{
BN_hex2bn(&dh->p,dh_prime_4096_hex.c_str()) ;
BN_hex2bn(&dh->g,"5") ;
std::cout.flush() ;
if(DH_check(dh, &codes) && codes == 0)
SSL_CTX_set_tmp_dh(sslctx, dh);
else
pfs_enabled = false ;
}
else
pfs_enabled = false ;
// certificates (Set Local Server Certificate).
FILE *ownfp = RsDirUtil::rs_fopen(cert_file, "r");
@ -339,8 +377,6 @@ static int initLib = 0;
return -1;
}
// get xPGP certificate.
X509 *x509 = PEM_read_X509(ownfp, NULL, NULL, NULL);
fclose(ownfp);
@ -393,7 +429,6 @@ static int initLib = 0;
CloseAuth();
return -1;
}
/* Check that Certificate is Ok ( virtual function )
* for gpg/pgp or CA verification
*/
@ -420,6 +455,22 @@ static int initLib = 0;
mOwnCert = new sslcert(x509, mOwnId);
std::cerr << "Inited SSL context: " << std::endl;
std::cerr << " Certificate: " << mOwnId << std::endl;
std::cerr << " cipher list: " << cipherString << std::endl;
std::cerr << " PFS enabled: " << (pfs_enabled?"YES":"NO") ;
if(codes > 0)
{
std::cerr << " (reason: " ;
if(codes & DH_CHECK_P_NOT_PRIME ) std::cerr << "Not a prime number, " ;
if(codes & DH_CHECK_P_NOT_SAFE_PRIME) std::cerr << "Not a safe prime number, " ;
if(codes & DH_UNABLE_TO_CHECK_GENERATOR) std::cerr << "unable to check generator, " ;
if(codes & DH_NOT_SUITABLE_GENERATOR) std::cerr << "not a suitable generator" ;
std::cerr << ")" << std::endl;
}
else
std::cerr << std::endl;
init = 1;
return 1;
}