starred/qemu-qemu-1
1
0
Fork 0
mirror of https://github.com/qemu/qemu.git synced 2026-02-04 02:24:51 +00:00
Code Issues Packages Projects Releases Wiki Activity

crypto: only verify CA certs in chain of trust

Browse Source 
The CA file provided to qemu may contain CA certificates which do not
form part of the chain of trust for the specific certificate we are
sanity checking.

This patch changes the sanity checking from validating every CA
certificate to only checking the CA certificates which are part of the
chain of trust (issuer chain).  Other certificates are ignored.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Henry Kleynhans <hkleynhans@fb.com>
[DB: changed 'int' to 'bool' in 'checking_issuer' variable]
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Henry Kleynhans
2021-12-22 15:06:00 +00:00
committed by Daniel P. Berrangé
parent b7a1f2ca45
commit 75216f239f
2 changed files with 75 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
crypto/tlscredsx509.c
View File

@@ -315,6 +315,51 @@ qcrypto_tls_creds_check_cert(QCryptoTLSCredsX509 *creds,
return 0;
}
static int
qcrypto_tls_creds_check_authority_chain(QCryptoTLSCredsX509 *creds,
gnutls_x509_crt_t cert,
gnutls_x509_crt_t *cacerts,
unsigned int ncacerts,
const char *cacertFile,
bool isServer,
bool isCA,
Error **errp)
{
gnutls_x509_crt_t *cert_to_check = &cert;
bool checking_issuer = true;
int retval = 0;
while (checking_issuer) {
checking_issuer = false;
if (gnutls_x509_crt_check_issuer(*cert_to_check,
*cert_to_check)) {
/*
* The cert is self-signed indicating we have
* reached the root of trust.
*/
return qcrypto_tls_creds_check_cert(
creds, *cert_to_check, cacertFile,
isServer, isCA, errp);
}
for (int i = 0; i < ncacerts; i++) {
if (gnutls_x509_crt_check_issuer(*cert_to_check,
cacerts[i])) {
retval = qcrypto_tls_creds_check_cert(
creds, cacerts[i], cacertFile,
isServer, isCA, errp);
if (retval < 0) {
return retval;
}
cert_to_check = &cacerts[i];
checking_issuer = true;
break;
}
}
}
return -1;
}
static int
qcrypto_tls_creds_check_cert_pair(gnutls_x509_crt_t cert,
@@ -499,12 +544,12 @@ qcrypto_tls_creds_x509_sanity_check(QCryptoTLSCredsX509 *creds,
goto cleanup;
}
for (i = 0; i < ncacerts; i++) {
if (qcrypto_tls_creds_check_cert(creds,
cacerts[i], cacertFile,
isServer, true, errp) < 0) {
goto cleanup;
}
if (cert &&
qcrypto_tls_creds_check_authority_chain(creds, cert,
cacerts, ncacerts,
cacertFile, isServer,
true, errp) < 0) {
goto cleanup;
}
if (cert && ncacerts &&