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Remove ability to independently select random number generator

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Remove the ability to select random number generator independently from
SSL library. Instead, use the random number generator from the SSL
library (today only OpenSSL supported) if one is configured. If no SSL
library is configured, use the platform default (which means use
CryptoAPI on Win32 and /dev/urandom on Linux).

This also restructures pg_strong_random.c to have three clearly separate
sections, one for each implementation, with two functions in each,
instead of a scattered set of ifdefs throughout the whole file.

Author: Daniel Gustafsson, Magnus Hagander, Michael Paquier
Discussion: https://postgr.es/m/632623.1605460616@sss.pgh.pa.us
This commit is contained in:
Magnus Hagander
2020-11-20 12:26:57 +01:00
parent b5acf10cfc
commit 16f96c74d4
5 changed files with 116 additions and 203 deletions
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41
configure.ac
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@ -2152,40 +2152,23 @@ else
SHMEM_IMPLEMENTATION="src/backend/port/win32_shmem.c"
fi
# Select random number source
#
# You can override this logic by setting the appropriate USE_*RANDOM flag to 1
# in the template or configure command line.
# If not selected manually, try to select a source automatically.
if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
if test x"$with_openssl" = x"yes" ; then
USE_OPENSSL_RANDOM=1
elif test "$PORTNAME" = "win32" ; then
USE_WIN32_RANDOM=1
else
AC_CHECK_FILE([/dev/urandom], [], [])
if test x"$ac_cv_file__dev_urandom" = x"yes" ; then
USE_DEV_URANDOM=1
fi
fi
fi
# Select random number source. If a TLS library is used then it will be the
# first choice, else the native platform sources (Windows API or /dev/urandom)
# will be used.
AC_MSG_CHECKING([which random number source to use])
if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
AC_DEFINE(USE_OPENSSL_RANDOM, 1, [Define to use OpenSSL for random number generation])
if test x"$with_openssl" = x"yes" ; then
AC_MSG_RESULT([OpenSSL])
elif test x"$USE_WIN32_RANDOM" = x"1" ; then
AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
elif test x"$PORTNAME" = x"win32" ; then
AC_MSG_RESULT([Windows native])
elif test x"$USE_DEV_URANDOM" = x"1" ; then
AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
AC_MSG_RESULT([/dev/urandom])
else
AC_MSG_ERROR([
AC_MSG_RESULT([/dev/urandom])
AC_CHECK_FILE([/dev/urandom], [], [])
if test x"$ac_cv_file__dev_urandom" = x"no" ; then
AC_MSG_ERROR([
no source of strong random numbers was found
PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
fi
fi
# If not set in template file, set bytes to use libc memset()