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[97.113.188.82]) by smtp.gmail.com with ESMTPSA id d26sm690816pfn.86.2019.03.14.20.26.41 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 14 Mar 2019 20:26:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=II4ZitPVyuBuTtikKVKTOwZYATc7zBTEhNb3dHQRGvg=; b=ZaJWCpv2Xoa4WQlrvPawZrbWqnV6d5uw5TSXRYxCDyzbZt+OxV5K959CZffqefwQXH 02PUnNTkr1/NktsJbrsXnHCJM0bf/0aX82VkVWdSRHbFTkKQVt83fYUUmBa75eQXzJ3r JJ0kGw5N0doqk8BMOv7GLRO0ENgX9qojYdSNEfRcvdUSrpcX3I0LrHzvrXTbwlENyYQc 6HaFmwfJ9/9skiSpwajtxd4gBMi7pXAkzrFVLnJWDfJaZ8SKC2hFFkOnQOLnuo8OMz/p +2n8bL84nJH1AtTJVbZvVmCxdBU/h9BQ4Hoz0guHVw8hP3jd1sBpVdKoeSh2uo04YlBx /aBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=II4ZitPVyuBuTtikKVKTOwZYATc7zBTEhNb3dHQRGvg=; b=SQcx0RtDZCFfYcrNvc+a2C4WNZYuKFH/ADKT4RR1VT4wVwcVH7cQ0X9LJmA+tycg2t 9+UZRRK1uIfBEY/U1d2xL1PYT6JD+qoRLM7EgS6iHrK2gHsU+cq9vLCyVfzL8zedUcyZ vRB/VwPgyS/d9T70UGIT5OslqRvpud56uAYem7JRVfC6FbpmDi6m9YnSrg/uCJXm6KPO kIwnW/gC4j8Cvs6xI5WkD31EpO4iwHc36BfVEfqDuxQxhUzHDBWxd3ILhdt+hirKDcYb zpoe/2887WWOSbYUjSDfHoeMDpfc2hXDMr3ljA+N6/HpbI3pxQ99ytVGtW/aWhz0DY3D eB5g== X-Gm-Message-State: APjAAAWMbiKYa3GgMnjoTmWiDlalN8L4HYHt2cYFRuSNs5EwSmYqY4Vv qjSKhT38zEkBKbMrU6qT/xhTDn/1zrE= X-Google-Smtp-Source: APXvYqyklUhVzsHLV+QwxzhZ2rKztmezez06FXqsF2POTpKydWPfF/maWSmgTcd81G/2sV2VremuQQ== X-Received: by 2002:aa7:9102:: with SMTP id 2mr1682269pfh.179.1552620402842; Thu, 14 Mar 2019 20:26:42 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Thu, 14 Mar 2019 20:26:14 -0700 Message-Id: <20190315032629.21234-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190315032629.21234-1-richard.henderson@linaro.org> References: <20190315032629.21234-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::52f Subject: [Qemu-devel] [PATCH v3 08/23] ui/vnc: Use gcrypto_random_bytes for start_auth_vnc X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Use a better interface for random numbers than rand(). Fail gracefully if for some reason we cannot use the crypto system. Cc: Gerd Hoffmann Signed-off-by: Richard Henderson Reviewed-by: Daniel P. Berrang=C3=A9 Reviewed-by: Gerd Hoffmann Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- v2: Use qcrypto_random_bytes, not qemu_getrandom, as there is no need for deterministic results for this interface. v3: Fail gracefully in the event qcrypto_random_bytes fails. --- ui/vnc.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/ui/vnc.c b/ui/vnc.c index 785edf3af1..d83f4a6ff9 100644 --- a/ui/vnc.c +++ b/ui/vnc.c @@ -43,6 +43,7 @@ #include "crypto/hash.h" #include "crypto/tlscredsanon.h" #include "crypto/tlscredsx509.h" +#include "crypto/random.h" #include "qom/object_interfaces.h" #include "qemu/cutils.h" #include "io/dns-resolver.h" @@ -2547,16 +2548,6 @@ static void authentication_failed(VncState *vs) vnc_client_error(vs); } =20 -static void make_challenge(VncState *vs) -{ - int i; - - srand(time(NULL)+getpid()+getpid()*987654+rand()); - - for (i =3D 0 ; i < sizeof(vs->challenge) ; i++) - vs->challenge[i] =3D (int) (256.0*rand()/(RAND_MAX+1.0)); -} - static int protocol_client_auth_vnc(VncState *vs, uint8_t *data, size_t le= n) { unsigned char response[VNC_AUTH_CHALLENGE_SIZE]; @@ -2628,7 +2619,16 @@ reject: =20 void start_auth_vnc(VncState *vs) { - make_challenge(vs); + Error *err =3D NULL; + + if (qcrypto_random_bytes(vs->challenge, sizeof(vs->challenge), &err)) { + trace_vnc_auth_fail(vs, vs->auth, "cannot get random bytes", + error_get_pretty(err)); + error_free(err); + authentication_failed(vs); + return; + } + /* Send client a 'random' challenge */ vnc_write(vs, vs->challenge, sizeof(vs->challenge)); vnc_flush(vs); --=20 2.17.2