Disable PKCS1.5 encryption in FIPS mode
Resolves: rhbz#2061328
This commit is contained in:
Jakub Jelen
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39ec934f65
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e5ba5309c6
219
libgcrypt-1.10.0-fips-disable-pkcs1.5.patch
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219
libgcrypt-1.10.0-fips-disable-pkcs1.5.patch
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@ -0,0 +1,219 @@
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From c7709f7b23848abf4ba65cb99cb2a9e9c7ebdefc Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Fri, 1 Apr 2022 18:29:08 +0200
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Subject: [PATCH 1/3] Do not allow PKCS #1.5 padding for encryption in FIPS
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* cipher/pubkey-util.c (_gcry_pk_util_data_to_mpi): Block PKCS #1.5
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padding for encryption in FIPS mode
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* cipher/rsa.c (rsa_decrypt): Block PKCS #1.5 decryption in FIPS mode
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--
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GnuPG-bug-id: 5918
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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 | 5 +++++
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2 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/cipher/pubkey-util.c b/cipher/pubkey-util.c
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index 68defea6..4953caf3 100644
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--- a/cipher/pubkey-util.c
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+++ b/cipher/pubkey-util.c
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@@ -957,7 +957,10 @@ _gcry_pk_util_data_to_mpi (gcry_sexp_t input, gcry_mpi_t *ret_mpi,
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void *random_override = NULL;
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size_t random_override_len = 0;
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- if ( !(value=sexp_nth_data (lvalue, 1, &valuelen)) || !valuelen )
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+ /* The RSA PKCS#1.5 encryption is no longer supported by 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 771413b3..c6319b67 100644
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--- a/cipher/rsa.c
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+++ b/cipher/rsa.c
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@@ -1391,6 +1391,11 @@ 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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+ {
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+ rc = GPG_ERR_INV_FLAG;
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+ goto leave;
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+ }
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/* Extract the key. */
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rc = sexp_extract_param (keyparms, NULL, "nedp?q?u?",
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--
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2.34.1
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From 299e2f93415984919181e0ee651719bbf83bdd2f Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Fri, 1 Apr 2022 18:31:05 +0200
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Subject: [PATCH 2/3] tests: Replace custom bit with more generic flags
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* tests/basic.c (global): New flag FLAG_SPECIAL
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(check_pubkey_crypt): Change to use bitfield flags
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--
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GnuPG-bug-id: 5918
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Signed-off-by: Jakub Jelen <jjelen@redhat.com>
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---
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tests/basic.c | 19 ++++++++++---------
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1 file changed, 10 insertions(+), 9 deletions(-)
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diff --git a/tests/basic.c b/tests/basic.c
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index a0ad33eb..1c6cb40b 100644
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--- a/tests/basic.c
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+++ b/tests/basic.c
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@@ -55,11 +55,12 @@ typedef struct test_spec_pubkey
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}
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test_spec_pubkey_t;
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-#define FLAG_CRYPT (1 << 0)
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-#define FLAG_SIGN (1 << 1)
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-#define FLAG_GRIP (1 << 2)
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-#define FLAG_NOFIPS (1 << 3)
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-#define FLAG_CFB8 (1 << 4)
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+#define FLAG_CRYPT (1 << 0)
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+#define FLAG_SIGN (1 << 1)
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+#define FLAG_GRIP (1 << 2)
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+#define FLAG_NOFIPS (1 << 3)
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+#define FLAG_CFB8 (1 << 4)
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+#define FLAG_SPECIAL (1 << 5)
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static int in_fips_mode;
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@@ -15558,7 +15559,7 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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int unpadded;
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int encrypt_expected_rc;
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int decrypt_expected_rc;
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- int special;
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+ int flags;
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} datas[] =
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{
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{ GCRY_PK_RSA,
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@@ -15642,14 +15643,14 @@ 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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- GPG_ERR_ENCODING_PROBLEM, 1 },
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+ GPG_ERR_ENCODING_PROBLEM, FLAG_SPECIAL },
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{ GCRY_PK_RSA,
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"(data\n (flags oaep)\n"
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" (value #11223344556677889900AA#))\n",
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"(flags pkcs1)",
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1,
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0,
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- GPG_ERR_ENCODING_PROBLEM, 1 },
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+ GPG_ERR_ENCODING_PROBLEM, FLAG_SPECIAL },
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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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@@ -15725,7 +15726,7 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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ciph = list;
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}
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rc = gcry_pk_decrypt (&plain, ciph, skey);
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- if (!rc && datas[dataidx].special == 1)
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+ if (!rc && (datas[dataidx].flags & FLAG_SPECIAL))
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{
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/* It may happen that OAEP formatted data which is
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decrypted as pkcs#1 data returns a valid pkcs#1
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--
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2.34.1
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From f736f3c70182d9c948f9105eb769c47c5578df35 Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Fri, 1 Apr 2022 18:34:42 +0200
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Subject: [PATCH 3/3] tests: Expect the RSA PKCS #1.5 encryption to fail in
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FIPS mode
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* tests/basic.c (check_pubkey_crypt): Expect RSA PKCS #1.5 encryption to
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fail in FIPS mode. Expect failure when wrong padding is selected
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* tests/pkcs1v2.c (check_v15crypt): Expect RSA PKCS #1.5 encryption to
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fail in FIPS mode
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--
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GnuPG-bug-id: 5918
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Signed-off-by: Jakub Jelen <jjelen@redhat.com>
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---
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tests/basic.c | 11 +++++++----
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tests/pkcs1v2.c | 14 +++++++++++++-
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2 files changed, 20 insertions(+), 5 deletions(-)
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diff --git a/tests/basic.c b/tests/basic.c
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index 1c6cb40b..85764591 100644
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--- a/tests/basic.c
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+++ b/tests/basic.c
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@@ -15568,14 +15568,16 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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NULL,
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0,
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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 pkcs1)\n"
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" (value #11223344556677889900AA#))\n",
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"(flags pkcs1)",
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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"
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" (value #11223344556677889900AA#))\n",
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@@ -15677,7 +15679,8 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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die ("converting data failed: %s\n", gpg_strerror (rc));
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rc = gcry_pk_encrypt (&ciph, data, pkey);
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- if (in_fips_mode && (flags & FLAG_NOFIPS))
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+ if (in_fips_mode && ((flags & FLAG_NOFIPS) ||
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+ (datas[dataidx].flags & FLAG_NOFIPS)))
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{
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if (!rc)
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fail ("gcry_pk_encrypt did not fail as expected in FIPS mode\n");
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@@ -15726,7 +15729,7 @@ check_pubkey_crypt (int n, gcry_sexp_t skey, gcry_sexp_t pkey, int algo,
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ciph = list;
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}
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rc = gcry_pk_decrypt (&plain, ciph, skey);
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- if (!rc && (datas[dataidx].flags & FLAG_SPECIAL))
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+ if ((!rc || in_fips_mode) && (datas[dataidx].flags & FLAG_SPECIAL))
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{
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/* It may happen that OAEP formatted data which is
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decrypted as pkcs#1 data returns a valid pkcs#1
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diff --git a/tests/pkcs1v2.c b/tests/pkcs1v2.c
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index f26e779b..6c7f3d81 100644
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--- a/tests/pkcs1v2.c
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+++ b/tests/pkcs1v2.c
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@@ -454,7 +454,19 @@ check_v15crypt (void)
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gcry_free (seed);
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err = gcry_pk_encrypt (&ciph, plain, pub_key);
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- if (err)
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+ if (in_fips_mode)
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+ {
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+ if (!err)
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+ {
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+ fail ("gcry_pk_encrypt should have failed in FIPS mode:\n");
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+ }
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+ gcry_sexp_release (plain);
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+ plain = NULL;
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+ gcry_sexp_release (ciph);
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+ ciph = NULL;
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+ continue;
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+ }
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+ else if (err)
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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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2.34.1
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@ -22,6 +22,7 @@ Source0: https://www.gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-%{version}.tar.bz2
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Source1: https://www.gnupg.org/ftp/gcrypt/libgcrypt/libgcrypt-%{version}.tar.bz2.sig
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Source2: wk@g10code.com
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Patch1: libgcrypt-1.10.0-disable-brainpool.patch
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Patch2: libgcrypt-1.10.0-fips-disable-pkcs1.5.patch
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%global gcrylibdir %{_libdir}
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%global gcrysoname libgcrypt.so.20
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@ -58,6 +59,7 @@ applications using libgcrypt.
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%prep
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%setup -q
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%patch1 -p1
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%patch2 -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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