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From 1fa33903be640f8d22757d21da294e70f0812698 Mon Sep 17 00:00:00 2001
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From: Robbie Harwood <rharwood@redhat.com>
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Date: Tue, 10 Oct 2017 18:00:45 -0400
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Subject: [PATCH] Only empty FILE ccaches when storing remote creds
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This mitigates issues when services share a ccache between two
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processes. We cannot fix this for FILE ccaches without introducing
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other issues.
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Signed-off-by: Robbie Harwood <rharwood@redhat.com>
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Reviewed-by: Simo Sorce <simo@redhat.com>
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Merges: #216
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(cherry picked from commit d09e87f47a21dd250bfd7a9c59a5932b5c995057)
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---
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proxy/src/mechglue/gpp_creds.c | 18 +++++++++++++-----
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1 file changed, 13 insertions(+), 5 deletions(-)
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diff --git a/proxy/src/mechglue/gpp_creds.c b/proxy/src/mechglue/gpp_creds.c
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index 9fe9bd1..6bdff45 100644
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--- a/proxy/src/mechglue/gpp_creds.c
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+++ b/proxy/src/mechglue/gpp_creds.c
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@@ -147,6 +147,7 @@ uint32_t gpp_store_remote_creds(uint32_t *min, bool default_creds,
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char cred_name[creds->desired_name.display_name.octet_string_len + 1];
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XDR xdrctx;
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bool xdrok;
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+ const char *cc_type;
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*min = 0;
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@@ -193,13 +194,20 @@ uint32_t gpp_store_remote_creds(uint32_t *min, bool default_creds,
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}
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cred.ticket.length = xdr_getpos(&xdrctx);
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- /* Always initialize and destroy any existing contents to avoid pileup of
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- * entries */
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- ret = krb5_cc_initialize(ctx, ccache, cred.client);
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- if (ret == 0) {
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- ret = krb5_cc_store_cred(ctx, ccache, &cred);
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+ cc_type = krb5_cc_get_type(ctx, ccache);
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+ if (strcmp(cc_type, "FILE") == 0) {
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+ /* FILE ccaches don't handle updates properly: if they have the same
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+ * principal name, they are blackholed. We either have to change the
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+ * name (at which point the file grows forever) or flash the cache on
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+ * every update. */
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+ ret = krb5_cc_initialize(ctx, ccache, cred.client);
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+ if (ret != 0) {
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+ goto done;
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+ }
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}
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+ ret = krb5_cc_store_cred(ctx, ccache, &cred);
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+
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done:
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if (ctx) {
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krb5_free_cred_contents(ctx, &cred);
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