Disable RSA-OAEP padding in FIPS mode
Resolves: rhbz#2118695
This commit is contained in:
Jakub Jelen
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f42be9ce3d
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c5605976bf
151
libgcrypt-1.10.0-fips-disable-oaep.patch
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151
libgcrypt-1.10.0-fips-disable-oaep.patch
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@ -0,0 +1,151 @@
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From 34d8fc576b3a06dd205f45327a971eb6771e808c Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Wed, 17 Aug 2022 09:01:44 +0200
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Subject: [PATCH 1/2] Disable RSA-OAEP padding in FIPS mode
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* cipher/pubkey-util.c (_gcry_pk_util_data_to_mpi): Block OAEP padding
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in FIPS mode for encryption
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* cipher/rsa.c (rsa_decrypt): Block OAEP padding in FIPS mode for
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decryption
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---
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Signed-off-by: Jakub Jelen <jjelen@redhat.com>
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---
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cipher/pubkey-util.c | 5 ++++-
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cipher/rsa.c | 3 ++-
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2 files changed, 6 insertions(+), 2 deletions(-)
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diff --git a/cipher/pubkey-util.c b/cipher/pubkey-util.c
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index 4953caf3..244dd5d4 100644
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--- a/cipher/pubkey-util.c
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+++ b/cipher/pubkey-util.c
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@@ -1092,7 +1092,10 @@ _gcry_pk_util_data_to_mpi (gcry_sexp_t input, gcry_mpi_t *ret_mpi,
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const void * value;
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size_t valuelen;
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- if ( !(value=sexp_nth_data (lvalue, 1, &valuelen)) || !valuelen )
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+ /* The RSA OAEP encryption requires some more assurances in FIPS */
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+ if (fips_mode ())
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+ rc = GPG_ERR_INV_FLAG;
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+ else if ( !(value=sexp_nth_data (lvalue, 1, &valuelen)) || !valuelen )
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rc = GPG_ERR_INV_OBJ;
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else
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{
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diff --git a/cipher/rsa.c b/cipher/rsa.c
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index 96dba090..87f57b55 100644
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--- a/cipher/rsa.c
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+++ b/cipher/rsa.c
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@@ -1457,7 +1457,8 @@ rsa_decrypt (gcry_sexp_t *r_plain, gcry_sexp_t s_data, gcry_sexp_t keyparms)
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rc = GPG_ERR_INV_DATA;
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goto leave;
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}
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- if (fips_mode () && (ctx.encoding == PUBKEY_ENC_PKCS1))
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+ if (fips_mode () && (ctx.encoding == PUBKEY_ENC_PKCS1 ||
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+ ctx.encoding == PUBKEY_ENC_OAEP))
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{
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rc = GPG_ERR_INV_FLAG;
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goto leave;
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--
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2.37.1
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From c6d64e697c2748a49e875060aa753fc568c5f772 Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Wed, 17 Aug 2022 10:31:19 +0200
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Subject: [PATCH 2/2] tests: Expect the OEAP tests to fail in FIPS mode
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* tests/basic.c (check_pubkey_crypt): Expect the OAEP padding encryption
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to fail in FIPS mode
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* tests/pkcs1v2.c (check_oaep): Expect the OAEP tests to fail in FIPS
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mode
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---
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Signed-off-by: Jakub Jelen <jjelen@redhat.com>
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---
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tests/basic.c | 14 +++++++++-----
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tests/pkcs1v2.c | 13 +++++++++++++
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2 files changed, 22 insertions(+), 5 deletions(-)
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diff --git a/tests/basic.c b/tests/basic.c
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index 26980e15..b4102c9f 100644
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--- a/tests/basic.c
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+++ b/tests/basic.c
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@@ -16892,21 +16892,24 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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"(flags oaep)",
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1,
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0,
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- 0 },
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+ 0,
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+ FLAG_NOFIPS },
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{ GCRY_PK_RSA,
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"(data\n (flags oaep)\n (hash-algo sha1)\n"
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" (value #11223344556677889900AA#))\n",
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"(flags oaep)(hash-algo sha1)",
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1,
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0,
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- 0 },
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+ 0,
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+ FLAG_NOFIPS },
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{ GCRY_PK_RSA,
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"(data\n (flags oaep)\n (hash-algo sha1)\n (label \"test\")\n"
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" (value #11223344556677889900AA#))\n",
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"(flags oaep)(hash-algo sha1)(label \"test\")",
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1,
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0,
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- 0 },
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+ 0,
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+ FLAG_NOFIPS },
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{ GCRY_PK_RSA,
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"(data\n (flags oaep)\n (hash-algo sha1)\n (label \"test\")\n"
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" (value #11223344556677889900AA#)\n"
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@@ -16914,7 +16917,8 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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"(flags oaep)(hash-algo sha1)(label \"test\")",
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1,
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0,
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- 0 },
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+ 0,
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+ FLAG_NOFIPS },
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{ 0,
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"(data\n (flags )\n" " (value #11223344556677889900AA#))\n",
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NULL,
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@@ -16960,7 +16964,7 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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"(flags pkcs1)",
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1,
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0,
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- GPG_ERR_ENCODING_PROBLEM, FLAG_SPECIAL },
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+ GPG_ERR_ENCODING_PROBLEM, FLAG_SPECIAL | FLAG_NOFIPS },
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{ 0,
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"(data\n (flags pss)\n"
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" (value #11223344556677889900AA#))\n",
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diff --git a/tests/pkcs1v2.c b/tests/pkcs1v2.c
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index 6c7f3d81..2fd495d5 100644
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--- a/tests/pkcs1v2.c
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+++ b/tests/pkcs1v2.c
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@@ -186,11 +186,24 @@ check_oaep (void)
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err = gcry_pk_encrypt (&ciph, plain, pub_key);
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if (err)
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{
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+ if (in_fips_mode)
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+ {
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+ gcry_sexp_release (plain);
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+ plain = NULL;
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+ continue;
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+ }
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show_sexp ("plain:\n", ciph);
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fail ("gcry_pk_encrypt failed: %s\n", gpg_strerror (err));
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}
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else
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{
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+ if (in_fips_mode)
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+ {
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+ fail ("The OAEP encryption unexpectedly worked in FIPS mode\n");
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+ gcry_sexp_release (plain);
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+ plain = NULL;
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+ continue;
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+ }
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if (extract_cmp_data (ciph, "a", tbl[tno].m[mno].encr,
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tbl[tno].m[mno].desc))
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{
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--
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2.37.1
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@ -28,6 +28,7 @@ Patch4: libgcrypt-1.10.0-allow-small-RSA-verify.patch
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Patch5: libgcrypt-1.10.0-allow-short-salt.patch
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Patch6: libgcrypt-1.10.0-fips-getrandom.patch
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Patch7: libgcrypt-1.10.0-fips-selftest.patch
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Patch8: libgcrypt-1.10.0-fips-disable-oaep.patch
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%global gcrylibdir %{_libdir}
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%global gcrysoname libgcrypt.so.20
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@ -70,6 +71,7 @@ applications using libgcrypt.
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%patch5 -p1
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%patch6 -p1
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%patch7 -p1
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%patch8 -p1
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%build
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# This package has a configure test which uses ASMs, but does not link the
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