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ui: convert VNC to use generic cipher API

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Switch the VNC server over to use the generic cipher API, this
allows it to use the pluggable DES implementations, instead of
being hardcoded to use QEMU's built-in impl.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1435770638-25715-11-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-07-01 18:10:38 +01:00 committed by Paolo Bonzini
parent f6fa64f6d2
commit 800567a613
1 changed files with 41 additions and 11 deletions
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52
ui/vnc.c
View file

@ -49,7 +49,7 @@ static const struct timeval VNC_REFRESH_STATS = { 0, 500000 };
static const struct timeval VNC_REFRESH_LOSSY = { 2, 0 };
#include "vnc_keysym.h"
#include "crypto/desrfb.h"
#include "crypto/cipher.h"
static QTAILQ_HEAD(, VncDisplay) vnc_displays =
QTAILQ_HEAD_INITIALIZER(vnc_displays);
@ -2517,9 +2517,11 @@ static void make_challenge(VncState *vs)
static int protocol_client_auth_vnc(VncState *vs, uint8_t *data, size_t len)
{
unsigned char response[VNC_AUTH_CHALLENGE_SIZE];
int i, j, pwlen;
size_t i, pwlen;
unsigned char key[8];
time_t now = time(NULL);
QCryptoCipher *cipher;
Error *err = NULL;
if (!vs->vd->password) {
VNC_DEBUG("No password configured on server");
@ -2536,9 +2538,29 @@ static int protocol_client_auth_vnc(VncState *vs, uint8_t *data, size_t len)
pwlen = strlen(vs->vd->password);
for (i=0; i<sizeof(key); i++)
key[i] = i<pwlen ? vs->vd->password[i] : 0;
deskey(key, EN0);
for (j = 0; j < VNC_AUTH_CHALLENGE_SIZE; j += 8)
des(response+j, response+j);
cipher = qcrypto_cipher_new(
QCRYPTO_CIPHER_ALG_DES_RFB,
QCRYPTO_CIPHER_MODE_ECB,
key, G_N_ELEMENTS(key),
&err);
if (!cipher) {
VNC_DEBUG("Cannot initialize cipher %s",
error_get_pretty(err));
error_free(err);
goto reject;
}
if (qcrypto_cipher_decrypt(cipher,
vs->challenge,
response,
VNC_AUTH_CHALLENGE_SIZE,
&err) < 0) {
VNC_DEBUG("Cannot encrypt challenge %s",
error_get_pretty(err));
error_free(err);
goto reject;
}
/* Compare expected vs actual challenge response */
if (memcmp(response, data, VNC_AUTH_CHALLENGE_SIZE) != 0) {
@ -3484,12 +3506,20 @@ void vnc_display_open(const char *id, Error **errp)
}
password = qemu_opt_get_bool(opts, "password", false);
if (password && fips_get_state()) {
error_setg(errp,
"VNC password auth disabled due to FIPS mode, "
"consider using the VeNCrypt or SASL authentication "
"methods as an alternative");
goto fail;
if (password) {
if (fips_get_state()) {
error_setg(errp,
"VNC password auth disabled due to FIPS mode, "
"consider using the VeNCrypt or SASL authentication "
"methods as an alternative");
goto fail;
}
if (!qcrypto_cipher_supports(
QCRYPTO_CIPHER_ALG_DES_RFB)) {
error_setg(errp,
"Cipher backend does not support DES RFB algorithm");
goto fail;
}
}
reverse = qemu_opt_get_bool(opts, "reverse", false);