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qemuDomainSecretAESSetup: Split out lookup of secret data

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Split out the lookup of the secret from the secret driver into
qemuDomainSecretAESSetupFromSecret so that we can also instantiate
secret objects in qemu with data from other sources.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2020-03-16 10:37:26 +01:00
parent bad8637892
commit 88663e59ef
1 changed files with 54 additions and 33 deletions
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87
src/qemu/qemu_domain.c
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@ -1514,37 +1514,28 @@ qemuDomainSecretPlainSetup(qemuDomainSecretInfoPtr secinfo,
/* qemuDomainSecretAESSetup:
* @priv: pointer to domain private object
* @secinfo: Pointer to secret info
* @srcalias: Alias of the disk/hostdev used to generate the secret alias
* @usageType: The virSecretUsageType
* @username: username to use for authentication (may be NULL)
* @seclookupdef: Pointer to seclookupdef data
* @isLuks: True/False for is for luks (alias generation)
* @alias: alias of the secret
* @username: username to use (may be NULL)
* @secret: secret data
* @secretlen: length of @secret
*
* Encrypts a secret looked up via @seclookupdef for use with qemu.
* Encrypts @secret for use with qemu.
*
* Returns qemuDomainSecretInfoPtr filled with the necessary information.
*/
static qemuDomainSecretInfoPtr
qemuDomainSecretAESSetup(qemuDomainObjPrivatePtr priv,
const char *srcalias,
virSecretUsageType usageType,
const char *alias,
const char *username,
virSecretLookupTypeDefPtr seclookupdef,
bool isLuks)
uint8_t *secret,
size_t secretlen)
{
g_autoptr(qemuDomainSecretInfo) secinfo = NULL;
g_autoptr(virConnect) conn = virGetConnectSecret();
g_autofree uint8_t *raw_iv = NULL;
size_t ivlen = QEMU_DOMAIN_AES_IV_LEN;
uint8_t *secret = NULL;
size_t secretlen = 0;
g_autofree uint8_t *ciphertext = NULL;
size_t ciphertextlen = 0;
if (!conn)
return NULL;
if (!qemuDomainSupportsEncryptedSecret(priv)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("encrypted secrets are not supported"));
@ -1554,11 +1545,9 @@ qemuDomainSecretAESSetup(qemuDomainObjPrivatePtr priv,
secinfo = g_new0(qemuDomainSecretInfo, 1);
secinfo->type = VIR_DOMAIN_SECRET_INFO_TYPE_AES;
secinfo->s.aes.alias = g_strdup(alias);
secinfo->s.aes.username = g_strdup(username);
if (!(secinfo->s.aes.alias = qemuDomainGetSecretAESAlias(srcalias, isLuks)))
return NULL;
raw_iv = g_new0(uint8_t, ivlen);
/* Create a random initialization vector */
@ -1568,29 +1557,61 @@ qemuDomainSecretAESSetup(qemuDomainObjPrivatePtr priv,
/* Encode the IV and save that since qemu will need it */
secinfo->s.aes.iv = g_base64_encode(raw_iv, ivlen);
/* Grab the unencoded secret */
if (virSecretGetSecretString(conn, seclookupdef, usageType,
&secret, &secretlen) < 0)
goto error;
if (virCryptoEncryptData(VIR_CRYPTO_CIPHER_AES256CBC,
priv->masterKey, QEMU_DOMAIN_MASTER_KEY_LEN,
raw_iv, ivlen, secret, secretlen,
&ciphertext, &ciphertextlen) < 0)
goto error;
/* Clear out the secret */
memset(secret, 0, secretlen);
return NULL;
/* Now encode the ciphertext and store to be passed to qemu */
secinfo->s.aes.ciphertext = g_base64_encode(ciphertext,
ciphertextlen);
return g_steal_pointer(&secinfo);
}
/**
* qemuDomainSecretAESSetupFromSecret:
* @priv: pointer to domain private object
* @srcalias: Alias of the disk/hostdev used to generate the secret alias
* @usageType: The virSecretUsageType
* @username: username to use for authentication (may be NULL)
* @seclookupdef: Pointer to seclookupdef data
* @isLuks: True/False for is for luks (alias generation)
*
* Looks up a secret in the secret driver based on @usageType and @seclookupdef
* and builds qemuDomainSecretInfoPtr from it.
*/
static qemuDomainSecretInfoPtr
qemuDomainSecretAESSetupFromSecret(qemuDomainObjPrivatePtr priv,
const char *srcalias,
virSecretUsageType usageType,
const char *username,
virSecretLookupTypeDefPtr seclookupdef,
bool isLuks)
{
g_autoptr(virConnect) conn = virGetConnectSecret();
qemuDomainSecretInfoPtr secinfo;
g_autofree char *alias = NULL;
uint8_t *secret = NULL;
size_t secretlen = 0;
if (!conn)
return NULL;
if (!(alias = qemuDomainGetSecretAESAlias(srcalias, isLuks)))
return NULL;
if (virSecretGetSecretString(conn, seclookupdef, usageType,
&secret, &secretlen) < 0)
return NULL;
secinfo = qemuDomainSecretAESSetup(priv, alias, username, secret, secretlen);
error:
VIR_DISPOSE_N(secret, secretlen);
return NULL;
return secinfo;
}
@ -1662,8 +1683,8 @@ qemuDomainSecretInfoNew(qemuDomainObjPrivatePtr priv,
virSecretLookupTypeDefPtr lookupDef,
bool isLuks)
{
return qemuDomainSecretAESSetup(priv, srcAlias, usageType, username,
lookupDef, isLuks);
return qemuDomainSecretAESSetupFromSecret(priv, srcAlias, usageType, username,
lookupDef, isLuks);
}