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[97.113.13.231]) by smtp.gmail.com with ESMTPSA id o6sm18682982pfa.88.2019.05.14.12.17.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 12:17:05 -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 :mime-version:content-transfer-encoding; bh=DHS+azgDjOz9872pwx2wjM+spw3T8bEncaHuHvbQJSc=; b=Vw6Ht19Cc2d0O99O4y9E/m6n5DH1o3Gac4gmuvKoHF6mzIIIqJX0fcbmXRNwQSku5V nw3E/OYtCeUDzGZQGlauJfh3ObBRa5XThIIkw7XVaCifv6N6CLNJKu6Mp+h2goGyNinl lZMEeFM8jSPfw8c8iIyG3lXULeRpIi87TMKS2oGeJfjjPslGhwlRygEM14LuD1kY9PN7 9jp0fdmo0SX7RFvapzFktNuGurDrTowL15YtjQYGg2i8R/LVPycYvHlw9AC0guZf1co/ COc6R+1D8W6c9ksEa/i2VOsoUqO1VmFalq2O4PBP4oHdqEpGlpT2IYsbRh/O3KK7H/nS 1lWw== 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:mime-version:content-transfer-encoding; bh=DHS+azgDjOz9872pwx2wjM+spw3T8bEncaHuHvbQJSc=; b=uHcjQidl/Hh4sHhbFiYqnjeCGjtf6NVnQAKbDerakY4ULqDPS8QGqpc/fX60ORlo6S yL7IVU6UjL6te7PVIjiDPEI1NoNoSRrExRf6eyy+cb0n1V//djbNXeu+6qyWlUXHwnzG eMyC/+HMsuXp64Df7KODnJzkHL3I3j9kkTYLleTa4zBgetgS+jteoJPyJd1iksqe9Xes ZZJ4xiRGl8qZKy6PQ//K9z3noK9PpO1ElRMOHn4KeTeX58zSGUqnwHMd/7wpGfCacclO Mew8cG4Ta4vrIRJQDYjBzXYGo+GDsJeZBuFxAGj8l7fXMMkvxZMueUJig7004YLnrfZ5 r+aw== X-Gm-Message-State: APjAAAWh/UZ7tRdAdv4uQfGoabGfnDamCqvZpmYW0aWqxljZAn+6PC6v zS/uf8VdiInbYPfvgY/5bxAvi+5o8q8= X-Google-Smtp-Source: APXvYqw8lbv3t8oCBHlpsI7gngLu6sinxqi1bc98GTxIhwPbcqZCXhym6mynVdBVRzG7kcuHyuOqIw== X-Received: by 2002:a63:690:: with SMTP id 138mr39216636pgg.415.1557861426286; Tue, 14 May 2019 12:17:06 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Tue, 14 May 2019 12:16:37 -0700 Message-Id: <20190514191653.31488-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190514191653.31488-1-richard.henderson@linaro.org> References: <20190514191653.31488-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::441 Subject: [Qemu-devel] [PATCH v7 08/24] 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: lvivier@redhat.com, berrange@redhat.com, armbru@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Use a better interface for random numbers than rand(). Fail gracefully if for some reason we cannot use the crypto system. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Gerd Hoffmann Reviewed-by: Daniel P. Berrang=C3=A9 Signed-off-by: Richard Henderson --- 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 2.17.1