From 3c04b692de1e7b45b764ff8d66bf84609b012e3a Mon Sep 17 00:00:00 2001 From: Tobias Heider Date: Tue, 27 Sep 2022 13:31:05 +0900 Subject: [PATCH] kdf:pkdf2: Check minimum allowed key size when running in FIPS mode. * cipher/kdf.c (_gcry_kdf_pkdf2): Add output length check. -- GnuPG-bug-id: 6219 --- cipher/kdf.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/cipher/kdf.c b/cipher/kdf.c index 81523320..67c60df8 100644 --- a/cipher/kdf.c +++ b/cipher/kdf.c @@ -160,6 +160,10 @@ _gcry_kdf_pkdf2 (const void *passphrase, size_t passphraselen, return GPG_ERR_INV_VALUE; #endif + /* Check minimum key size */ + if (fips_mode () && dklen < 14) + return GPG_ERR_INV_VALUE; + /* Step 2 */ l = ((dklen - 1)/ hlen) + 1; -- 2.37.3 From e5a5e847b66eb6b80e60a2dffa347268f059aee3 Mon Sep 17 00:00:00 2001 From: Jakub Jelen Date: Tue, 4 Oct 2022 12:44:54 +0200 Subject: [PATCH] tests: Reproducer for short dklen in FIPS mode * tests/t-kdf.c (check_pbkdf2): Add test vector with short dklen and verify it fails in FIPS mode -- GnuPG-bug-id: 6219 Signed-off-by: Jakub Jelen --- tests/t-kdf.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/tests/t-kdf.c b/tests/t-kdf.c index c0192d7b..716fb53e 100644 --- a/tests/t-kdf.c +++ b/tests/t-kdf.c @@ -909,6 +909,14 @@ check_pbkdf2 (void) "\x0c\x60\xc8\x0f\x96\x1f\x0e\x71\xf3\xa9" "\xb5\x24\xaf\x60\x12\x06\x2f\xe0\x37\xa6" }, + { + "password", 8, + "salt", 4, + GCRY_MD_SHA1, + 1, + 10, /* too short dklen for FIPS */ + "\x0c\x60\xc8\x0f\x96\x1f\x0e\x71\xf3\xa9" + }, { "password", 8, "salt", 4, @@ -1109,7 +1117,7 @@ check_pbkdf2 (void) GCRY_KDF_PBKDF2, tv[tvidx].hashalgo, tv[tvidx].salt, tv[tvidx].saltlen, tv[tvidx].c, tv[tvidx].dklen, outbuf); - if (in_fips_mode && tvidx > 6) + if (in_fips_mode && tvidx > 7) { if (!err) fail ("pbkdf2 test %d unexpectedly passed in FIPS mode: %s\n", @@ -1118,7 +1126,7 @@ check_pbkdf2 (void) } if (err) { - if (in_fips_mode && tv[tvidx].plen < 14) + if (in_fips_mode && (tv[tvidx].plen < 14 || tv[tvidx].dklen < 14)) { if (verbose) fprintf (stderr, -- 2.37.3 From f4a861f3e5ae82f278284061e4829c03edf9c3a7 Mon Sep 17 00:00:00 2001 From: Jakub Jelen Date: Fri, 18 Nov 2022 09:49:50 +0900 Subject: [PATCH] pkdf2: Add checks for FIPS. * cipher/kdf.c (_gcry_kdf_pkdf2): Require 8 chars passphrase for FIPS. Set bounds for salt length and iteration count in FIPS mode. -- GnuPG-bug-id: 6039 Signed-off-by: Jakub Jelen --- cipher/kdf.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/cipher/kdf.c b/cipher/kdf.c index d22584da..823c744e 100644 --- a/cipher/kdf.c +++ b/cipher/kdf.c @@ -160,6 +160,18 @@ _gcry_kdf_pkdf2 (const void *passphrase, size_t passphraselen, return GPG_ERR_INV_VALUE; #endif + /* FIPS requires minimum passphrase length, see FIPS 140-3 IG D.N */ + if (fips_mode () && passphraselen < 8) + return GPG_ERR_INV_VALUE; + + /* FIPS requires minimum salt length of 128 b (SP 800-132 sec. 5.1, p.6) */ + if (fips_mode () && saltlen < 16) + return GPG_ERR_INV_VALUE; + + /* FIPS requires minimum iterations bound (SP 800-132 sec 5.2, p.6) */ + if (fips_mode () && iterations < 1000) + return GPG_ERR_INV_VALUE; + /* Check minimum key size */ if (fips_mode () && dklen < 14) return GPG_ERR_INV_VALUE; -- 2.39.0