Hide other user's pg_stat_ssl rows

Change pg_stat_ssl so that an unprivileged user can only see their own
rows; other rows will be all null.  This makes the behavior consistent
with pg_stat_activity, where information about where the connection
came from is also restricted.

Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://www.postgresql.org/message-id/flat/63117976-d02c-c8e2-3aef-caa31a5ab8d3%402ndquadrant.com

diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index b6ba856ebe6e106638a497df1846e764d34af5d9..69f72657792e7d713cee1983cd7f08c95415c965 100644 (file)
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -645,38 +645,6 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
        else
            nulls[16] = true;
 
-       if (beentry->st_ssl)
-       {
-           values[18] = BoolGetDatum(true);    /* ssl */
-           values[19] = CStringGetTextDatum(beentry->st_sslstatus->ssl_version);
-           values[20] = CStringGetTextDatum(beentry->st_sslstatus->ssl_cipher);
-           values[21] = Int32GetDatum(beentry->st_sslstatus->ssl_bits);
-           values[22] = BoolGetDatum(beentry->st_sslstatus->ssl_compression);
-
-           if (beentry->st_sslstatus->ssl_client_dn[0])
-               values[23] = CStringGetTextDatum(beentry->st_sslstatus->ssl_client_dn);
-           else
-               nulls[23] = true;
-
-           if (beentry->st_sslstatus->ssl_client_serial[0])
-               values[24] = DirectFunctionCall3(numeric_in,
-                                                CStringGetDatum(beentry->st_sslstatus->ssl_client_serial),
-                                                ObjectIdGetDatum(InvalidOid),
-                                                Int32GetDatum(-1));
-           else
-               nulls[24] = true;
-
-           if (beentry->st_sslstatus->ssl_issuer_dn[0])
-               values[25] = CStringGetTextDatum(beentry->st_sslstatus->ssl_issuer_dn);
-           else
-               nulls[25] = true;
-       }
-       else
-       {
-           values[18] = BoolGetDatum(false);   /* ssl */
-           nulls[19] = nulls[20] = nulls[21] = nulls[22] = nulls[23] = nulls[24] = nulls[25] = true;
-       }
-
        /* Values only available to role member or pg_read_all_stats */
        if (has_privs_of_role(GetUserId(), beentry->st_userid) ||
            is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_ALL_STATS))
@@ -854,6 +822,39 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
            else
                values[17] =
                    CStringGetTextDatum(pgstat_get_backend_desc(beentry->st_backendType));
+
+           /* SSL information */
+           if (beentry->st_ssl)
+           {
+               values[18] = BoolGetDatum(true);    /* ssl */
+               values[19] = CStringGetTextDatum(beentry->st_sslstatus->ssl_version);
+               values[20] = CStringGetTextDatum(beentry->st_sslstatus->ssl_cipher);
+               values[21] = Int32GetDatum(beentry->st_sslstatus->ssl_bits);
+               values[22] = BoolGetDatum(beentry->st_sslstatus->ssl_compression);
+
+               if (beentry->st_sslstatus->ssl_client_dn[0])
+                   values[23] = CStringGetTextDatum(beentry->st_sslstatus->ssl_client_dn);
+               else
+                   nulls[23] = true;
+
+               if (beentry->st_sslstatus->ssl_client_serial[0])
+                   values[24] = DirectFunctionCall3(numeric_in,
+                                                    CStringGetDatum(beentry->st_sslstatus->ssl_client_serial),
+                                                    ObjectIdGetDatum(InvalidOid),
+                                                    Int32GetDatum(-1));
+               else
+                   nulls[24] = true;
+
+               if (beentry->st_sslstatus->ssl_issuer_dn[0])
+                   values[25] = CStringGetTextDatum(beentry->st_sslstatus->ssl_issuer_dn);
+               else
+                   nulls[25] = true;
+           }
+           else
+           {
+               values[18] = BoolGetDatum(false);   /* ssl */
+               nulls[19] = nulls[20] = nulls[21] = nulls[22] = nulls[23] = nulls[24] = nulls[25] = true;
+           }
        }
        else
        {
@@ -870,6 +871,14 @@ pg_stat_get_activity(PG_FUNCTION_ARGS)
            nulls[13] = true;
            nulls[14] = true;
            nulls[17] = true;
+           nulls[18] = true;
+           nulls[19] = true;
+           nulls[20] = true;
+           nulls[21] = true;
+           nulls[22] = true;
+           nulls[23] = true;
+           nulls[24] = true;
+           nulls[25] = true;
        }
 
        tuplestore_putvalues(tupstore, tupdesc, values, nulls);