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SSL: optimized rotation of session ticket keys. Instead of syncing keys with shared memory on each ticket operation, the code now does this only when the worker is going to change expiration of the current key, or going to switch to a new key: that is, usually at most once per second. To do so without races, the code maintains 3 keys: current, previous, and next. If a worker will switch to the next key earlier, other workers will still be able to decrypt new tickets, since they will be encrypted with the next key.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2022 20:14:55 +0300
parents d620f497c50f
children
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $NGX_LIBATOMIC != YES ]; then

    have=NGX_HAVE_LIBATOMIC . auto/have
    CORE_INCS="$CORE_INCS $NGX_LIBATOMIC/src"
    LINK_DEPS="$LINK_DEPS $NGX_LIBATOMIC/src/libatomic_ops.a"
    CORE_LIBS="$CORE_LIBS $NGX_LIBATOMIC/src/libatomic_ops.a"

else

    ngx_feature="atomic_ops library"
    ngx_feature_name=NGX_HAVE_LIBATOMIC
    ngx_feature_run=yes
    ngx_feature_incs="#define AO_REQUIRE_CAS
                      #include <atomic_ops.h>"
    ngx_feature_path=
    ngx_feature_libs="-latomic_ops"
    ngx_feature_test="long  n = 0;
                      if (!AO_compare_and_swap(&n, 0, 1))
                          return 1;
                      if (AO_fetch_and_add(&n, 1) != 1)
                          return 1;
                      if (n != 2)
                          return 1;
                      AO_nop();"
    . auto/feature

    if [ $ngx_found = yes ]; then
        CORE_LIBS="$CORE_LIBS $ngx_feature_libs"
    else

cat << END

$0: error: libatomic_ops library was not found.

END
        exit 1
    fi
fi