sssd/0028-NSS-add-support-for-SSS_NSS_EX_FLAG_NO_CACHE.patch

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From 32f913dd143d45aee7f3d91785a86d8e2a85bb22 Mon Sep 17 00:00:00 2001
From: Sumit Bose <sbose@redhat.com>
Date: Thu, 12 Oct 2017 10:42:41 +0200
Subject: [PATCH 28/79] NSS: add support for SSS_NSS_EX_FLAG_NO_CACHE
If SSS_NSS_EX_FLAG_NO_CACHE is set the object is refresh by directly
looking it up in the backend.
Related to https://pagure.io/SSSD/sssd/issue/2478
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
---
src/responder/nss/nss_cmd.c | 8 ++++
src/sss_client/idmap/sss_nss_ex.c | 71 ++++++++++++++++++++----------------
src/sss_client/idmap/sss_nss_idmap.h | 4 ++
3 files changed, 52 insertions(+), 31 deletions(-)
diff --git a/src/responder/nss/nss_cmd.c b/src/responder/nss/nss_cmd.c
index 974eaccc93cea3a330007735676da69eb9b84141..c5ddd2f2cc2122cd169ea991b94a14eb5bad095f 100644
--- a/src/responder/nss/nss_cmd.c
+++ b/src/responder/nss/nss_cmd.c
@@ -92,6 +92,10 @@ static errno_t nss_getby_name(struct cli_ctx *cli_ctx,
goto done;
}
+ if ((flags & SSS_NSS_EX_FLAG_NO_CACHE) != 0) {
+ cache_req_data_set_bypass_cache(data, true);
+ }
+
subreq = nss_get_object_send(cmd_ctx, cli_ctx->ev, cli_ctx,
data, memcache, rawname, 0);
if (subreq == NULL) {
@@ -152,6 +156,10 @@ static errno_t nss_getby_id(struct cli_ctx *cli_ctx,
goto done;
}
+ if ((flags & SSS_NSS_EX_FLAG_NO_CACHE) != 0) {
+ cache_req_data_set_bypass_cache(data, true);
+ }
+
subreq = nss_get_object_send(cmd_ctx, cli_ctx->ev, cli_ctx,
data, memcache, NULL, id);
if (subreq == NULL) {
diff --git a/src/sss_client/idmap/sss_nss_ex.c b/src/sss_client/idmap/sss_nss_ex.c
index dc7610a4e528b5126f0d25d84cd3c1a22f683b75..edb3ea652ef7032b76c8f815b9f83fe185a669ea 100644
--- a/src/sss_client/idmap/sss_nss_ex.c
+++ b/src/sss_client/idmap/sss_nss_ex.c
@@ -115,42 +115,51 @@ int sss_get_ex(struct nss_input *inp, uint32_t flags, unsigned int timeout)
size_t c;
gid_t *new_groups;
size_t idx;
+ bool skip_mc = false;
- ret = sss_nss_mc_get(inp);
- switch (ret) {
- case 0:
- return 0;
- case ERANGE:
- return ERANGE;
- case ENOENT:
- /* fall through, we need to actively ask the parent
- * if no entry is found */
- break;
- default:
- /* if using the mmaped cache failed,
- * fall back to socket based comms */
- break;
+ if ((flags & SSS_NSS_EX_FLAG_NO_CACHE) != 0) {
+ skip_mc = true;
+ }
+
+ if (!skip_mc) {
+ ret = sss_nss_mc_get(inp);
+ switch (ret) {
+ case 0:
+ return 0;
+ case ERANGE:
+ return ERANGE;
+ case ENOENT:
+ /* fall through, we need to actively ask the parent
+ * if no entry is found */
+ break;
+ default:
+ /* if using the mmaped cache failed,
+ * fall back to socket based comms */
+ break;
+ }
}
sss_nss_timedlock(timeout, &time_left);
- /* previous thread might already initialize entry in mmap cache */
- ret = sss_nss_mc_get(inp);
- switch (ret) {
- case 0:
- ret = 0;
- goto out;
- case ERANGE:
- ret = ERANGE;
- goto out;
- case ENOENT:
- /* fall through, we need to actively ask the parent
- * if no entry is found */
- break;
- default:
- /* if using the mmaped cache failed,
- * fall back to socket based comms */
- break;
+ if (!skip_mc) {
+ /* previous thread might already initialize entry in mmap cache */
+ ret = sss_nss_mc_get(inp);
+ switch (ret) {
+ case 0:
+ ret = 0;
+ goto out;
+ case ERANGE:
+ ret = ERANGE;
+ goto out;
+ case ENOENT:
+ /* fall through, we need to actively ask the parent
+ * if no entry is found */
+ break;
+ default:
+ /* if using the mmaped cache failed,
+ * fall back to socket based comms */
+ break;
+ }
}
ret = sss_nss_make_request_timeout(inp->cmd, &inp->rd, time_left,
diff --git a/src/sss_client/idmap/sss_nss_idmap.h b/src/sss_client/idmap/sss_nss_idmap.h
index 2334b6cb3fb8ef62e4ce3a7187c7affaeaa034e7..1649830afbb80c617fd339f054aef8bc8e585fb9 100644
--- a/src/sss_client/idmap/sss_nss_idmap.h
+++ b/src/sss_client/idmap/sss_nss_idmap.h
@@ -169,6 +169,10 @@ void sss_nss_free_kv(struct sss_nss_kv *kv_list);
#define SSS_NSS_EX_FLAG_NO_FLAGS 0
+/** Always request data from the server side, client must be privileged to do
+ * so, see nss_trusted_users option in man sssd.conf for details */
+#define SSS_NSS_EX_FLAG_NO_CACHE (1 << 0)
+
#ifdef IPA_389DS_PLUGIN_HELPER_CALLS
/**
--
2.15.1