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[libvirt] [PATCH] qemu: Fix bug assuming usage of default UUID for certificate passphrase

If an environment specific _tls_x509_cert_dir is provided, then
do not VIR_STRDUP the defaultTLSx509secretUUID as that would be
for the "default" environment and not the vnc, spice, chardev, or
migrate environments. If the environment needs a secret to decode
it's certificate, then it must provide the secret. If the secrets
happen to be the same, then configuration would use the same UUID
as the default (but we cannot assume that nor can we assume that
the secret would be necessary).

Signed-off-by: John Ferlan <jferlan redhat com>

 While responding to a different patch today regarding Veritas and
 usage of a default environment w/ or w/o secrets I realized that
 the existing logic has a flaw in "assuming" that someone would want
 to use the default secret. What if they defined their own environment
 without a secret?  Then the code would create a secret object to pass
 to QEMU which would think it needs to use it to decode the server
 certificate (but it doesn't), so it would seemingly fail the start.
 I assume based on the lack of complaints about this that everyone just
 uses the default environment!

 src/qemu/qemu_conf.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index c4714ed..a7a2aaa 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -526,14 +526,18 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
             goto cleanup;                                                   \
         if (rv == 0)                                                        \
             cfg->val## TLSx509verify = cfg->defaultTLSx509verify;           \
-        if (virConfGetValueString(conf, #val "_tls_x509_cert_dir",          \
-                                  &cfg->val## TLSx509certdir) < 0)          \
+        if ((rv = virConfGetValueString(conf, #val "_tls_x509_cert_dir",    \
+                                  &cfg->val## TLSx509certdir)) < 0)         \
             goto cleanup;                                                   \
         if (virConfGetValueString(conf,                                     \
                                   #val "_tls_x509_secret_uuid",             \
                                   &cfg->val## TLSx509secretUUID) < 0)       \
             goto cleanup;                                                   \
-        if (!cfg->val## TLSx509secretUUID &&                                \
+        /* Only if a *tls_x509_cert_dir wasn't found (e.g. rv == 0), should \
+         * we copy the defaultTLSx509secretUUID. If this environment needs  \
+         * a passphrase to decode the certificate, then it should provide   \
+         * it's own secretUUID for that. */                                 \
+        if (rv == 0 && !cfg->val## TLSx509secretUUID &&                     \
             cfg->defaultTLSx509secretUUID) {                                \
             if (VIR_STRDUP(cfg->val## TLSx509secretUUID,                    \
                            cfg->defaultTLSx509secretUUID) < 0)              \

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