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Author: Antonio Torres <antorres@redhat.com>
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Date: Fri Jul 2 07:12:48 2021 -0400
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Subject: [PATCH] exit if host in FIPS mode and MD5 not explicitly allowed
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FIPS does not allow MD5, which FreeRADIUS needs to work. The user should
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explicitly allow MD5 usage by setting the RADIUS_MD5_FIPS_OVERRIDE environment
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variable to 1 or else FR should exit at start.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1958979
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Signed-off-by: Antonio Torres antorres@redhat.com
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---
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src/main/radiusd.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/src/main/radiusd.c b/src/main/radiusd.c
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index 9739514509..58a48895e6 100644
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--- a/src/main/radiusd.c
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+++ b/src/main/radiusd.c
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@@ -298,6 +298,20 @@ int main(int argc, char *argv[])
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exit(EXIT_FAILURE);
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}
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+ /*
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+ * If host is in FIPS mode, we need the user to explicitly allow MD5 usage.
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+ */
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+ char *fips_md5_override = getenv("RADIUS_MD5_FIPS_OVERRIDE");
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+ FILE *fips_file = fopen("/proc/sys/crypto/fips_enabled", "r");
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+ if (fips_file != NULL) {
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+ int fips_enabled = fgetc(fips_file) - '0';
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+ fclose(fips_file);
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+ if (fips_enabled == 1 && (fips_md5_override == NULL || atoi(fips_md5_override) != 1)) {
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+ fprintf(stderr, "Cannot run FreeRADIUS in FIPS mode because it uses MD5. To allow MD5 usage, set RADIUS_MD5_FIPS_OVERRIDE=1 before starting FreeRADIUS.\n");
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+ exit(EXIT_FAILURE);
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+ }
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+ }
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+
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/*
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* According to the talloc peeps, no two threads may modify any part of
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* a ctx tree with a common root without synchronisation.
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