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From 1a7538f0d73b4b35769c4df5ba32ed836e26a648 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <abokovoy@redhat.com>
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Date: Wed, 8 Aug 2018 13:04:04 +0300
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Subject: [PATCH] ipasam: do not use RC4 in FIPS mode
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When creating Kerberos keys for trusted domain object account, ipasam
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module requests to generate keys using a series of well-known encryption
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types. In FIPS mode it is not possible to generate RC4-HMAC key:
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MIT Kerberos is using openssl crypto backend and openssl does not allow
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use of RC4 in FIPS mode.
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Thus, we have to filter out RC4-HMAC encryption type when running in
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FIPS mode. A side-effect is that a trust to Active Directory running
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with Windows Server 2003 will not be possible anymore in FIPS mode.
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Resolves: https://pagure.io/freeipa/issue/7659
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Reviewed-By: Robbie Harwood <rharwood@redhat.com>
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---
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daemons/ipa-sam/ipa_sam.c | 23 +++++++++++++++++++----
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1 file changed, 19 insertions(+), 4 deletions(-)
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diff --git a/daemons/ipa-sam/ipa_sam.c b/daemons/ipa-sam/ipa_sam.c
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index 0cd48d845b2edf9f328de0a949f80f98f9ef9025..675a511f0febf13cc5e00b547c18a050ac534f2e 100644
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--- a/daemons/ipa-sam/ipa_sam.c
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+++ b/daemons/ipa-sam/ipa_sam.c
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@@ -213,6 +213,7 @@ struct ipasam_private {
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char *client_princ;
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struct sss_idmap_ctx *idmap_ctx;
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uint32_t supported_enctypes;
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+ bool fips_enabled;
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};
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@@ -1737,6 +1738,10 @@ static bool search_krb_princ(struct ipasam_private *ipasam_state,
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return true;
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}
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+/* Please keep ENCTYPE_ARCFOUR_HMAC the last in the list
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+ * of the default encryption types so that we can exclude
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+ * it when running in a FIPS mode where it is not allowed
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+ */
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#define DEF_ENCTYPE_NUM 3
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long default_enctypes[DEF_ENCTYPE_NUM] = {
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ENCTYPE_AES256_CTS_HMAC_SHA1_96,
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@@ -1754,9 +1759,14 @@ static int set_cross_realm_pw(struct ipasam_private *ipasam_state,
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struct berval reqdata = { 0 };
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struct berval *retdata = NULL;
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char *retoid;
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+ int enctypes_num = DEF_ENCTYPE_NUM;
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+ if (ipasam_state->fips_enabled) {
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+ DEBUG(1, ("FIPS mode enabled: TDO account credentials will not have RC4-HMAC!\n"));
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+ enctypes_num = DEF_ENCTYPE_NUM - 1;
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+ }
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ret = ipaasn1_enc_getkt(true, princ, pwd,
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- default_enctypes, DEF_ENCTYPE_NUM,
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+ default_enctypes, enctypes_num,
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&buffer, &buflen);
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if (!ret) goto done;
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@@ -3935,7 +3945,9 @@ static NTSTATUS ipasam_get_enctypes(struct ipasam_private *ipasam_state,
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*enctypes |= KERB_ENCTYPE_DES_CBC_MD5;
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break;
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case ENCTYPE_ARCFOUR_HMAC:
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- *enctypes |= KERB_ENCTYPE_RC4_HMAC_MD5;
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+ if (!ipasam_state->fips_enabled) {
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+ *enctypes |= KERB_ENCTYPE_RC4_HMAC_MD5;
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+ }
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break;
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case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
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*enctypes |= KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96;
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@@ -4563,6 +4575,7 @@ static NTSTATUS pdb_init_ipasam(struct pdb_methods **pdb_method,
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return NT_STATUS_INVALID_PARAMETER;
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}
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+ ipasam_state->fips_enabled = ipapwd_fips_enabled();
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ipasam_state->trust_dn = talloc_asprintf(ipasam_state,
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"cn=ad,cn=trusts,%s",
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ipasam_state->base_dn);
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@@ -4684,9 +4697,11 @@ static NTSTATUS pdb_init_ipasam(struct pdb_methods **pdb_method,
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&enctypes);
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if (!NT_STATUS_IS_OK(status)) {
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- enctypes = KERB_ENCTYPE_RC4_HMAC_MD5 |
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- KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96 |
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+ enctypes = KERB_ENCTYPE_AES128_CTS_HMAC_SHA1_96 |
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KERB_ENCTYPE_AES256_CTS_HMAC_SHA1_96;
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+ if (!ipasam_state->fips_enabled) {
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+ enctypes |= KERB_ENCTYPE_RC4_HMAC_MD5;
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+ }
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}
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ipasam_state->supported_enctypes = enctypes;
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--
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2.17.1
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