diff options
Diffstat (limited to 'src/network/ssl/qssldiffiehellmanparameters_openssl.cpp')
-rw-r--r-- | src/network/ssl/qssldiffiehellmanparameters_openssl.cpp | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp b/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp index 90687b05c5..5ebad822f1 100644 --- a/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp +++ b/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp @@ -1,6 +1,7 @@ /**************************************************************************** ** ** Copyright (C) 2015 Mikkel Krautz <mikkel@krautz.dk> +** Copyright (C) 2016 Richard J. Moore <rich@kde.org> ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtNetwork module of the Qt Toolkit. @@ -50,8 +51,8 @@ #include <QtCore/qdebug.h> #endif -// For q_BN_is_word. #include <openssl/bn.h> +#include <openssl/dh.h> QT_BEGIN_NAMESPACE @@ -62,13 +63,6 @@ static bool isSafeDH(DH *dh) QSslSocketPrivate::ensureInitialized(); - // Mark p < 1024 bits as unsafe. - if (q_BN_num_bits(dh->p) < 1024) { - return false; - } - - if (q_DH_check(dh, &status) != 1) - return false; // From https://wiki.openssl.org/index.php/Diffie-Hellman_parameters: // @@ -81,11 +75,39 @@ static bool isSafeDH(DH *dh) // Without the test, the IETF parameters would // fail validation. For details, see Diffie-Hellman // Parameter Check (when g = 2, must p mod 24 == 11?). +#if QT_CONFIG(opensslv11) + // Mark p < 1024 bits as unsafe. + if (q_DH_bits(dh) < 1024) + return false; + + if (q_DH_check(dh, &status) != 1) + return false; + + const BIGNUM *p = nullptr; + const BIGNUM *q = nullptr; + const BIGNUM *g = nullptr; + q_DH_get0_pqg(dh, &p, &q, &g); + + if (q_BN_is_word(const_cast<BIGNUM *>(g), DH_GENERATOR_2)) { + long residue = q_BN_mod_word(p, 24); + if (residue == 11 || residue == 23) + status &= ~DH_NOT_SUITABLE_GENERATOR; + } + +#else + // Mark p < 1024 bits as unsafe. + if (q_BN_num_bits(dh->p) < 1024) + return false; + + if (q_DH_check(dh, &status) != 1) + return false; + if (q_BN_is_word(dh->g, DH_GENERATOR_2)) { long residue = q_BN_mod_word(dh->p, 24); if (residue == 11 || residue == 23) status &= ~DH_NOT_SUITABLE_GENERATOR; } +#endif bad |= DH_CHECK_P_NOT_PRIME; bad |= DH_CHECK_P_NOT_SAFE_PRIME; |