shm cache: increase default maximum number of active sessions

from 500 to 2000 and allow configuration of max 1Mb of session data for
a single session

Signed-off-by: Hans Zandbelt <[email protected]>

Author: zandbelt

ChangeLog

@@ -1,3 +1,7 @@
+03/10/2023
+- shm cache: increase default maximum number of active sessions from 500 to 2000
+- shm cache: allow configuration of max 1Mb of session data for a single session
+
 03/09/2023
 - add support for OP "signed_jwks_uri" with "OIDCProviderSignedJwksUri <uri> <jwk>"
 - don't pull JWKs when the id_token was signed with a symmetric key

src/config.c

@@ -96,11 +96,9 @@
 /* default duration in seconds after which retrieved JWS should be refreshed */
 #define OIDC_DEFAULT_JWKS_REFRESH_INTERVAL 3600
 /* default max cache size for shm */
-#define OIDC_DEFAULT_CACHE_SHM_SIZE 500
+#define OIDC_DEFAULT_CACHE_SHM_SIZE 2000
 /* default max cache entry size for shm: # value + # key + # overhead */
 #define OIDC_DEFAULT_CACHE_SHM_ENTRY_SIZE_MAX 16384 + 512 + 17
-/* minimum size of a cache entry */
-#define OIDC_MINIMUM_CACHE_SHM_ENTRY_SIZE_MAX 8192 + 512 + 17
 /* for issued-at timestamp (iat) checking */
 #define OIDC_DEFAULT_IDTOKEN_IAT_SLACK 600
 /* for file-based caching: clean interval in seconds */

src/parse.c

@@ -353,7 +353,7 @@ const char* oidc_parse_session_type(apr_pool_t *pool, const char *arg, int *type
 /* minimum size of a SHM cache entry */
 #define OIDC_MINIMUM_CACHE_SHM_ENTRY_SIZE_MAX 8192 + 512 + 17 // 8Kb plus overhead
 /* maximum size of a SHM cache entry */
-#define OIDC_MAXIMUM_CACHE_SHM_ENTRY_SIZE_MAX 1024 * 512     // 512Kb incl. overhead
+#define OIDC_MAXIMUM_CACHE_SHM_ENTRY_SIZE_MAX 1024 * 1024     // 1Mb incl. overhead
 
 /*
  * parse the slot size of a SHM cache entry