The Samba-Bugzilla – Attachment 13866 Details for
Bug 13135
The KDC logic arround msDs-supportedEncryptionTypes differs from Windows
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[patch]
Work in progress patches
tmp.diff.txt (text/plain), 14.24 KB, created by
Stefan Metzmacher
on 2017-12-13 13:03:06 UTC
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Description:
Work in progress patches
Filename:
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Creator:
Stefan Metzmacher
Created:
2017-12-13 13:03:06 UTC
Size:
14.24 KB
patch
obsolete
>From 7e2b114016b8abca66a973cd8e5603c47c976ebb Mon Sep 17 00:00:00 2001 >From: Stefan Metzmacher <metze@samba.org> >Date: Wed, 8 Nov 2017 11:57:08 +0100 >Subject: [PATCH 1/5] HEIMDAL:kdc: let _kdc_encode_reply() use the encryption > type based on the server key > >Currently the value is the same anyway as the session key is always of the >same type as server key up to now, but that will change shortly. > >BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135 > >Signed-off-by: Stefan Metzmacher <metze@samba.org> >--- > source4/heimdal/kdc/kerberos5.c | 5 ++--- > source4/heimdal/kdc/krb5tgs.c | 2 +- > 2 files changed, 3 insertions(+), 4 deletions(-) > >diff --git a/source4/heimdal/kdc/kerberos5.c b/source4/heimdal/kdc/kerberos5.c >index 4baf90e..366a545 100644 >--- a/source4/heimdal/kdc/kerberos5.c >+++ b/source4/heimdal/kdc/kerberos5.c >@@ -322,7 +322,6 @@ krb5_error_code > _kdc_encode_reply(krb5_context context, > krb5_kdc_configuration *config, > KDC_REP *rep, const EncTicketPart *et, EncKDCRepPart *ek, >- krb5_enctype etype, > int skvno, const EncryptionKey *skey, > int ckvno, const EncryptionKey *reply_key, > int rk_is_subkey, >@@ -349,7 +348,7 @@ _kdc_encode_reply(krb5_context context, > return KRB5KRB_ERR_GENERIC; > } > >- ret = krb5_crypto_init(context, skey, etype, &crypto); >+ ret = krb5_crypto_init(context, skey, 0, &crypto); > if (ret) { > const char *msg; > free(buf); >@@ -1751,7 +1750,7 @@ _kdc_as_rep(krb5_context context, > log_as_req(context, config, reply_key->keytype, setype, b); > > ret = _kdc_encode_reply(context, config, >- &rep, &et, &ek, setype, server->entry.kvno, >+ &rep, &et, &ek, server->entry.kvno, > &skey->key, client->entry.kvno, > reply_key, 0, &e_text, reply); > free_EncTicketPart(&et); >diff --git a/source4/heimdal/kdc/krb5tgs.c b/source4/heimdal/kdc/krb5tgs.c >index 5033a24..05fd321 100644 >--- a/source4/heimdal/kdc/krb5tgs.c >+++ b/source4/heimdal/kdc/krb5tgs.c >@@ -988,7 +988,7 @@ tgs_make_reply(krb5_context context, > etype list, even if we don't want a session key with > DES3? */ > ret = _kdc_encode_reply(context, config, >- &rep, &et, &ek, et.key.keytype, >+ &rep, &et, &ek, > kvno, > serverkey, 0, replykey, rk_is_subkey, > e_text, reply); >-- >1.9.1 > > >From 95d9003b6283f61dd4867c849d2efa89264c34e5 Mon Sep 17 00:00:00 2001 >From: Stefan Metzmacher <metze@samba.org> >Date: Tue, 7 Nov 2017 15:47:25 +0100 >Subject: [PATCH 2/5] HEIMDAL:hdb: export a hdb_enctype_supported() helper > function > >BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135 > >Signed-off-by: Stefan Metzmacher <metze@samba.org> >--- > source4/heimdal/kdc/kerberos5.c | 15 ++++++++++----- > source4/heimdal/kdc/krb5tgs.c | 3 +-- > source4/heimdal/lib/hdb/hdb.c | 30 +++++++++++++++++++++++++++--- > source4/heimdal/lib/hdb/version-script.map | 1 + > 4 files changed, 39 insertions(+), 10 deletions(-) > >diff --git a/source4/heimdal/kdc/kerberos5.c b/source4/heimdal/kdc/kerberos5.c >index 366a545..5118d8e 100644 >--- a/source4/heimdal/kdc/kerberos5.c >+++ b/source4/heimdal/kdc/kerberos5.c >@@ -131,7 +131,7 @@ _kdc_find_etype(krb5_context context, krb5_boolean use_strongest_session_key, > krb5_error_code ret; > krb5_salt def_salt; > krb5_enctype enctype = ETYPE_NULL; >- Key *key; >+ Key *key = NULL; > int i; > > /* We'll want to avoid keys with v4 salted keys in the pre-auth case... */ >@@ -159,29 +159,34 @@ _kdc_find_etype(krb5_context context, krb5_boolean use_strongest_session_key, > > /* drive the search with local supported enctypes list */ > p = krb5_kerberos_enctypes(context); >- for (i = 0; p[i] != ETYPE_NULL && enctype == ETYPE_NULL; i++) { >+ for (i = 0; p[i] != ETYPE_NULL && key == NULL; i++) { > if (krb5_enctype_valid(context, p[i]) != 0) > continue; > > /* check that the client supports it too */ >- for (j = 0; j < len && enctype == ETYPE_NULL; j++) { >+ for (j = 0; j < len && key == NULL; j++) { > if (p[i] != etypes[j]) > continue; > /* save best of union of { client, crypto system } */ > if (clientbest == ETYPE_NULL) > clientbest = p[i]; >+ if (enctype == ETYPE_NULL) { >+ ret = hdb_enctype_supported(context, &princ->entry, p[i]); >+ if (ret == 0) { >+ enctype = p[i]; >+ } >+ } > /* check target princ support */ > ret = hdb_enctype2key(context, &princ->entry, p[i], &key); > if (ret) > continue; > if (is_preauth && !is_default_salt_p(&def_salt, key)) > continue; >- enctype = p[i]; > } > } > if (clientbest != ETYPE_NULL && enctype == ETYPE_NULL) > enctype = clientbest; >- else if (enctype == ETYPE_NULL) >+ else if (key == NULL) > ret = KRB5KDC_ERR_ETYPE_NOSUPP; > if (ret == 0 && ret_enctype != NULL) > *ret_enctype = enctype; >diff --git a/source4/heimdal/kdc/krb5tgs.c b/source4/heimdal/kdc/krb5tgs.c >index 05fd321..e11ad52 100644 >--- a/source4/heimdal/kdc/krb5tgs.c >+++ b/source4/heimdal/kdc/krb5tgs.c >@@ -1705,7 +1705,7 @@ server_lookup: > > ret = _kdc_find_etype(context, > config->tgs_use_strongest_session_key, FALSE, >- server, b->etype.val, b->etype.len, NULL, >+ server, b->etype.val, b->etype.len, &etype, > &skey); > if(ret) { > kdc_log(context, config, 0, >@@ -1713,7 +1713,6 @@ server_lookup: > goto out; > } > ekey = &skey->key; >- etype = skey->key.keytype; > kvno = server->entry.kvno; > } > >diff --git a/source4/heimdal/lib/hdb/hdb.c b/source4/heimdal/lib/hdb/hdb.c >index 5dc5a09..4c8df93 100644 >--- a/source4/heimdal/lib/hdb/hdb.c >+++ b/source4/heimdal/lib/hdb/hdb.c >@@ -93,11 +93,12 @@ static struct hdb_method dbmetod = > #endif > > >-krb5_error_code >-hdb_next_enctype2key(krb5_context context, >+static krb5_error_code >+_hdb_next_enctype2key(krb5_context context, > const hdb_entry *e, > krb5_enctype enctype, >- Key **key) >+ Key **key, >+ bool require_key) > { > Key *k; > >@@ -105,6 +106,10 @@ hdb_next_enctype2key(krb5_context context, > k < e->keys.val + e->keys.len; > k++) > { >+ if (require_key && k->key.keyvalue.length == 0) { >+ continue; >+ } >+ > if(k->key.keytype == enctype){ > *key = k; > return 0; >@@ -116,6 +121,16 @@ hdb_next_enctype2key(krb5_context context, > return KRB5_PROG_ETYPE_NOSUPP; /* XXX */ > } > >+ >+krb5_error_code >+hdb_next_enctype2key(krb5_context context, >+ const hdb_entry *e, >+ krb5_enctype enctype, >+ Key **key) >+{ >+ return _hdb_next_enctype2key(context, e, enctype, key, true); >+} >+ > krb5_error_code > hdb_enctype2key(krb5_context context, > hdb_entry *e, >@@ -126,6 +141,15 @@ hdb_enctype2key(krb5_context context, > return hdb_next_enctype2key(context, e, enctype, key); > } > >+krb5_error_code >+hdb_enctype_supported(krb5_context context, >+ hdb_entry *e, >+ krb5_enctype enctype) >+{ >+ Key *key = NULL; >+ return _hdb_next_enctype2key(context, e, enctype, &key, false); >+} >+ > void > hdb_free_key(Key *key) > { >diff --git a/source4/heimdal/lib/hdb/version-script.map b/source4/heimdal/lib/hdb/version-script.map >index f80fb78..c4bd8f4 100644 >--- a/source4/heimdal/lib/hdb/version-script.map >+++ b/source4/heimdal/lib/hdb/version-script.map >@@ -20,6 +20,7 @@ HEIMDAL_HDB_1.0 { > hdb_dbinfo_get_realm; > hdb_default_db; > hdb_enctype2key; >+ hdb_enctype_supported; > hdb_entry2string; > hdb_entry2value; > hdb_entry_alias2value; >-- >1.9.1 > > >From 835b960cc6dc0ceb3aa007718fb5fab85f881a7a Mon Sep 17 00:00:00 2001 >From: Stefan Metzmacher <metze@samba.org> >Date: Tue, 7 Nov 2017 18:03:45 +0100 >Subject: [PATCH 3/5] s4:kdc: use the strongest possible tgs session key > >BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135 > >Signed-off-by: Stefan Metzmacher <metze@samba.org> >--- > source4/kdc/kdc-heimdal.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > >diff --git a/source4/kdc/kdc-heimdal.c b/source4/kdc/kdc-heimdal.c >index d5c721b..883158d 100644 >--- a/source4/kdc/kdc-heimdal.c >+++ b/source4/kdc/kdc-heimdal.c >@@ -373,10 +373,14 @@ static void kdc_task_init(struct task_server *task) > * > * The old behavior in the _kdc_get_preferred_key() > * function is use_strongest_server_key=TRUE. >+ * >+ * We actually want the behavior of >+ * tgs_use_strongest_session_key=TRUE, >+ * see https://bugzilla.samba.org/show_bug.cgi?id=13135 > */ > kdc_config->as_use_strongest_session_key = false; > kdc_config->preauth_use_strongest_session_key = false; >- kdc_config->tgs_use_strongest_session_key = false; >+ kdc_config->tgs_use_strongest_session_key = true; > kdc_config->use_strongest_server_key = true; > > kdc_config->autodetect_referrals = false; >-- >1.9.1 > > >From 28b89388522f387ac60db7d95972ec75fde0de5c Mon Sep 17 00:00:00 2001 >From: Stefan Metzmacher <metze@samba.org> >Date: Tue, 7 Nov 2017 12:23:31 +0100 >Subject: [PATCH 4/5] TODO s4:kdc: msDS-SupportedEncryptionTypes only on > computers > >BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135 >--- > source4/kdc/db-glue.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > >diff --git a/source4/kdc/db-glue.c b/source4/kdc/db-glue.c >index 9ac5a1d..0480009 100644 >--- a/source4/kdc/db-glue.c >+++ b/source4/kdc/db-glue.c >@@ -337,6 +337,14 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > "msDS-SupportedEncryptionTypes", > 0); > >+ if (userAccountControl & UF_NORMAL_ACCOUNT) { >+ supported_enctypes = 0; >+ } >+ if (supported_enctypes == 0) { >+ /* Otherwise, add in the default enc types */ >+ supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5; >+ } >+ > if (rid == DOMAIN_RID_KRBTGT || is_rodc) { > /* KDCs (and KDCs on RODCs) use AES */ > supported_enctypes |= ENC_HMAC_SHA1_96_AES128 | ENC_HMAC_SHA1_96_AES256; >@@ -357,7 +365,7 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > /* If UF_USE_DES_KEY_ONLY has been set, then don't allow use of the newer enc types */ > if (userAccountControl & UF_USE_DES_KEY_ONLY) { > supported_enctypes = ENC_CRC32|ENC_RSA_MD5; >- } else { >+ } else if (supported_enctypes == 0) { > /* Otherwise, add in the default enc types */ > supported_enctypes |= ENC_CRC32 | ENC_RSA_MD5 | ENC_RC4_HMAC_MD5; > } >-- >1.9.1 > > >From aa54bb1f6eca4460feea918e32fc675703dee004 Mon Sep 17 00:00:00 2001 >From: Stefan Metzmacher <metze@samba.org> >Date: Tue, 7 Nov 2017 12:23:31 +0100 >Subject: [PATCH 5/5] TODO s4:kdc: indicate support for new encryption types by > adding empty keys > >BUG: https://bugzilla.samba.org/show_bug.cgi?id=13135 >--- > source4/kdc/db-glue.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 60 insertions(+), 3 deletions(-) > >diff --git a/source4/kdc/db-glue.c b/source4/kdc/db-glue.c >index 0480009..bd78c15 100644 >--- a/source4/kdc/db-glue.c >+++ b/source4/kdc/db-glue.c >@@ -316,6 +316,7 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > bool is_rodc, > uint32_t userAccountControl, > enum samba_kdc_ent_type ent_type, >+ unsigned flags, > struct sdb_entry_ex *entry_ex) > { > krb5_error_code ret = 0; >@@ -336,6 +337,30 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > = ldb_msg_find_attr_as_uint(msg, > "msDS-SupportedEncryptionTypes", > 0); >+ uint32_t new_session_enctypes = 0; >+ const krb5_enctype newer_enctypes[] = { >+ ENCTYPE_AES256_CTS_HMAC_SHA1_96, >+ ENCTYPE_AES128_CTS_HMAC_SHA1_96, >+ }; >+ >+ switch (ent_type) { >+ case SAMBA_KDC_ENT_TYPE_CLIENT: >+ case SAMBA_KDC_ENT_TYPE_ANY: >+ break; >+ case SAMBA_KDC_ENT_TYPE_SERVER: >+ case SAMBA_KDC_ENT_TYPE_KRBTGT: >+ case SAMBA_KDC_ENT_TYPE_TRUST: >+ if (flags & (SDB_F_FOR_AS_REQ|SDB_F_FOR_TGS_REQ)) { >+ /* >+ * We should indicate support for new encryption >+ * types (for session keys) via empty keyvalues, >+ * in case we don't have stored keys for such encryption >+ * types. >+ */ >+ new_session_enctypes = supported_enctypes; >+ } >+ break; >+ } > > if (userAccountControl & UF_NORMAL_ACCOUNT) { > supported_enctypes = 0; >@@ -572,6 +597,8 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > return 0; > } > >+ allocated_keys += ARRAY_SIZE(newer_enctypes); >+ > /* allocate space to decode into */ > entry_ex->entry.keys.len = 0; > entry_ex->entry.keys.val = calloc(allocated_keys, sizeof(struct sdb_key)); >@@ -599,12 +626,15 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > if (pkb4) { > for (i=0; i < pkb4->num_keys; i++) { > struct sdb_key key = {}; >+ uint32_t enctype; > > if (!pkb4->keys[i].value) continue; > >- if (!(kerberos_enctype_to_bitmap(pkb4->keys[i].keytype) & supported_enctypes)) { >+ enctype = kerberos_enctype_to_bitmap(pkb4->keys[i].keytype); >+ if (!(enctype & supported_enctypes)) { > continue; > } >+ new_session_enctypes &= ~enctype; > > if (pkb4->salt.string) { > DATA_BLOB salt; >@@ -657,12 +687,15 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > } else if (pkb3) { > for (i=0; i < pkb3->num_keys; i++) { > struct sdb_key key = {}; >+ uint32_t enctype; > > if (!pkb3->keys[i].value) continue; > >- if (!(kerberos_enctype_to_bitmap(pkb3->keys[i].keytype) & supported_enctypes)) { >+ enctype = kerberos_enctype_to_bitmap(pkb3->keys[i].keytype); >+ if (!(enctype & supported_enctypes)) { > continue; > } >+ new_session_enctypes &= ~enctype; > > if (pkb3->salt.string) { > DATA_BLOB salt; >@@ -706,6 +739,30 @@ static krb5_error_code samba_kdc_message2entry_keys(krb5_context context, > } > } > >+ /* >+ * Check if we should announce support for newer encryption >+ * types, which can be used as session keys, while the >+ * last password change only stored older keys. >+ * >+ * We do that by providing entries with empty key values. >+ */ >+ for (i = 0; i < ARRAY_SIZE(newer_enctypes); i++) { >+ struct sdb_key key = { >+ .key = { >+ .keytype = newer_enctypes[i], >+ }, >+ }; >+ uint32_t enctype; >+ >+ enctype = kerberos_enctype_to_bitmap(key.key.keytype); >+ if (!(enctype & new_session_enctypes)) { >+ continue; >+ } >+ >+ entry_ex->entry.keys.val[entry_ex->entry.keys.len] = key; >+ entry_ex->entry.keys.len++; >+ } >+ > out: > if (ret != 0) { > entry_ex->entry.keys.len = 0; >@@ -1139,7 +1196,7 @@ static krb5_error_code samba_kdc_message2entry(krb5_context context, > /* Get keys from the db */ > ret = samba_kdc_message2entry_keys(context, kdc_db_ctx, p, msg, > rid, is_rodc, userAccountControl, >- ent_type, entry_ex); >+ ent_type, flags, entry_ex); > if (ret) { > /* Could be bogus data in the entry, or out of memory */ > goto out; >-- >1.9.1 >
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