s3-pdb: Break SECRETS3 dependency on PDB.

This is causing circular depdnendcies that bring libpdb in all code and this is
BAD.

This change 'protects' the sid and guid of the domain by adding a special key
that makes them effectively read only.

Limit this temporarily to the samba 4 build, once it gets some good testing the
samba4 ifdefs can be dropped.

fix pdb dependencies

Signed-off-by: Andreas Schneider <asn@samba.org>

4 files changed, 68 insertions, 60 deletions

diff --git a/source3/auth/wscript_build b/source3/auth/wscript_build
index 4f04772b4c..0dba13f7cb 100644
--- a/source3/auth/wscript_build
+++ b/source3/auth/wscript_build
@@ -16,7 +16,7 @@ AUTH_SRC = '''auth.c
 
 bld.SAMBA3_SUBSYSTEM('TOKEN_UTIL',
                     source='token_util.c',
-                    deps='samba-util',
+                    deps='samba-util pdb',
                     vars=locals())
 
 bld.SAMBA3_SUBSYSTEM('USER_UTIL',
diff --git a/source3/include/secrets.h b/source3/include/secrets.h
index 705a3296dc..6cb2e0473e 100644
--- a/source3/include/secrets.h
+++ b/source3/include/secrets.h
@@ -39,6 +39,7 @@
    really secret. */
 #define SECRETS_DOMAIN_SID    "SECRETS/SID"
 #define SECRETS_SAM_SID       "SAM/SID"
+#define SECRETS_PROTECT_IDS   "SECRETS/PROTECT/IDS"
 
 /* The domain GUID and server GUID (NOT the same) are also not secret */
 #define SECRETS_DOMAIN_GUID   "SECRETS/DOMGUID"
@@ -88,6 +89,10 @@ void secrets_shutdown(void);
 void *secrets_fetch(const char *key, size_t *size);
 bool secrets_store(const char *key, const void *data, size_t size);
 bool secrets_delete(const char *key);
+
+/* The following definitions come from passdb/machine_account_secrets.c */
+bool secrets_mark_domain_protected(const char *domain);
+bool secrets_clear_domain_protection(const char *domain);
 bool secrets_store_domain_sid(const char *domain, const struct dom_sid  *sid);
 bool secrets_fetch_domain_sid(const char *domain, struct dom_sid  *sid);
 bool secrets_store_domain_guid(const char *domain, struct GUID *guid);
diff --git a/source3/passdb/machine_account_secrets.c b/source3/passdb/machine_account_secrets.c
index 565c7c4c20..a2bd8be493 100644
--- a/source3/passdb/machine_account_secrets.c
+++ b/source3/passdb/machine_account_secrets.c
@@ -53,18 +53,52 @@ static const char *domain_sid_keystr(const char *domain)
 	return keystr;
 }
 
+static const char *protect_ids_keystr(const char *domain)
+{
+	char *keystr;
+
+	keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
+					    SECRETS_PROTECT_IDS, domain);
+	SMB_ASSERT(keystr != NULL);
+	return keystr;
+}
+
+/* N O T E: never use this outside of passdb modules that store the SID on their own */
+bool secrets_mark_domain_protected(const char *domain)
+{
+	bool ret;
+
+	ret = secrets_store(protect_ids_keystr(domain), "TRUE", 5);
+	if (!ret) {
+		DEBUG(0, ("Failed to protect the Domain IDs\n"));
+	}
+	return ret;
+}
+
+bool secrets_clear_domain_protection(const char *domain)
+{
+	bool ret;
+
+	ret = secrets_delete(protect_ids_keystr(domain));
+	if (!ret) {
+		DEBUG(0, ("Failed to remove Domain IDs protection\n"));
+	}
+	return ret;
+}
+
 bool secrets_store_domain_sid(const char *domain, const struct dom_sid  *sid)
 {
+	char *protect_ids;
 	bool ret;
 
 #if _SAMBA_BUILD_ == 4
-	if (strequal(domain, get_global_sam_name()) &&
-	    (pdb_capabilities() & PDB_CAP_ADS)) {
-		/* If we have a ADS-capable passdb backend, we
-		 * must never make up our own SID, it will
-		 * already be in the directory */
-		DEBUG(0, ("Refusing to store a Domain SID, this should be read from the directory not stored here\n"));
-		return false;
+	protect_ids = secrets_fetch(protect_ids_keystr(domain), NULL);
+	if (protect_ids) {
+		if (strncmp(protect_ids, "TRUE", 4)) {
+			DEBUG(0, ("Refusing to store a Domain SID, "
+				  "it has been marked as protected!\n"));
+			return false;
+		}
 	}
 #endif
 
@@ -81,24 +115,6 @@ bool secrets_fetch_domain_sid(const char *domain, struct dom_sid  *sid)
 	struct dom_sid  *dyn_sid;
 	size_t size = 0;
 
-#if _SAMBA_BUILD_ == 4
-	if (strequal(domain, get_global_sam_name()) &&
-	    (pdb_capabilities() & PDB_CAP_ADS)) {
-		struct pdb_domain_info *domain_info;
-		domain_info = pdb_get_domain_info(talloc_tos());
-		if (!domain_info) {
-			/* If we have a ADS-capable passdb backend, we
-			 * must never make up our own SID, it will
-			 * already be in the directory */
-			DEBUG(0, ("Unable to fetch a Domain SID from the directory!\n"));
-			return false;
-		}
-
-		*sid = domain_info->sid;
-		return true;
-	}
-#endif
-
 	dyn_sid = (struct dom_sid  *)secrets_fetch(domain_sid_keystr(domain), &size);
 
 	if (dyn_sid == NULL)
@@ -116,16 +132,17 @@ bool secrets_fetch_domain_sid(const char *domain, struct dom_sid  *sid)
 
 bool secrets_store_domain_guid(const char *domain, struct GUID *guid)
 {
+	char *protect_ids;
 	fstring key;
 
 #if _SAMBA_BUILD_ == 4
-	if (strequal(domain, get_global_sam_name()) &&
-	    (pdb_capabilities() & PDB_CAP_ADS)) {
-		/* If we have a ADS-capable passdb backend, we
-		 * must never make up our own GUID, it will
-		 * already be in the directory */
-		DEBUG(0, ("Refusing to store a Domain GUID, this should be read from the directory not stored here\n"));
-		return false;
+	protect_ids = secrets_fetch(protect_ids_keystr(domain), NULL);
+	if (protect_ids) {
+		if (strncmp(protect_ids, "TRUE", 4)) {
+			DEBUG(0, ("Refusing to store a Domain SID, "
+				  "it has been marked as protected!\n"));
+			return false;
+		}
 	}
 #endif
 
@@ -141,24 +158,6 @@ bool secrets_fetch_domain_guid(const char *domain, struct GUID *guid)
 	size_t size = 0;
 	struct GUID new_guid;
 
-#if _SAMBA_BUILD_ == 4
-	if (strequal(domain, get_global_sam_name()) &&
-	    (pdb_capabilities() & PDB_CAP_ADS)) {
-		struct pdb_domain_info *domain_info;
-		domain_info = pdb_get_domain_info(talloc_tos());
-		if (!domain_info) {
-			/* If we have a ADS-capable passdb backend, we
-			 * must never make up our own SID, it will
-			 * already be in the directory */
-			DEBUG(0, ("Unable to fetch a Domain GUID from the directory!\n"));
-			return false;
-		}
-
-		*guid = domain_info->guid;
-		return true;
-	}
-#endif
-
 	slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_GUID, domain);
 	strupper_m(key);
 	dyn_guid = (struct GUID *)secrets_fetch(key, &size);
diff --git a/source3/wscript_build b/source3/wscript_build
index 6d856a544f..60524709a7 100755
--- a/source3/wscript_build
+++ b/source3/wscript_build
@@ -692,7 +692,7 @@ bld.SAMBA3_LIBRARY('nss_wins',
 
 bld.SAMBA3_LIBRARY('gse',
                    source='librpc/crypto/gse_krb5.c librpc/crypto/gse.c',
-                   deps='KRB5_WRAP gensec param KRBCLIENT SECRETS3',
+                   deps='KRB5_WRAP gensec param KRBCLIENT secrets3',
                    private_library=True)
 
 bld.SAMBA3_LIBRARY('msrpc3',
@@ -725,7 +725,7 @@ bld.SAMBA3_SUBSYSTEM('TLDAP',
 
 bld.SAMBA3_LIBRARY('pdb',
                    source=PASSDB_SRC,
-                   deps='SECRETS3 GROUPDB SERVER_MUTEX wbclient LIBCLI_AUTH flag_mapping',
+                   deps='secrets3 GROUPDB SERVER_MUTEX wbclient LIBCLI_AUTH flag_mapping',
                    private_library=True,
                    public_headers='''
 				include/passdb.h
@@ -800,7 +800,7 @@ bld.SAMBA3_LIBRARY('popt_samba3',
 
 bld.SAMBA3_LIBRARY('util_cmdline',
                    source='lib/util_cmdline.c',
-                   deps='SECRETS3 popt',
+                   deps='secrets3 popt',
                    private_library=True)
 
 bld.SAMBA3_SUBSYSTEM('KRBCLIENT',
@@ -871,9 +871,13 @@ bld.SAMBA3_SUBSYSTEM('CLDAP',
                     deps='cli-ldap-common cli_cldap LIBTSOCKET',
                     vars=locals())
 
-bld.SAMBA3_SUBSYSTEM('SECRETS3',
+# NOTE: The secrets3 library is a low level library used by several subsystems.
+# PLEASE DO NOT make it depend on high level libraries like PDB, if you are
+# doing that your design is wrong and needs changing. -SSS
+bld.SAMBA3_LIBRARY('secrets3',
                    source=SECRETS_SRC,
-                   deps='NDR_SECRETS param samba3util dbwrap pdb',
+                   deps='NDR_SECRETS param samba3util dbwrap',
+                   private_library=True,
                    vars=locals())
 
 bld.SAMBA3_LIBRARY('smbldap',
@@ -1010,7 +1014,7 @@ bld.SAMBA3_SUBSYSTEM('FNAME_UTIL',
 
 bld.SAMBA3_SUBSYSTEM('LIBNET',
                     source=LIBNET_SRC,
-                    deps='NDR_LIBNET_JOIN INIT_SAMR net_keytab',
+                    deps='NDR_LIBNET_JOIN INIT_SAMR net_keytab pdb',
                     vars=locals())
 
 bld.SAMBA3_LIBRARY('net_keytab',
@@ -1074,7 +1078,7 @@ bld.SAMBA3_SUBSYSTEM('DCUTIL',
 
 bld.SAMBA3_LIBRARY('trusts_util',
                    source='libsmb/trusts_util.c',
-                   deps='libcli_netlogon3 msrpc3',
+                   deps='libcli_netlogon3 msrpc3 pdb',
                    vars=locals(),
                    private_library=True)
 
@@ -1148,7 +1152,7 @@ bld.SAMBA3_LIBRARY('libcli_netlogon3',
 
 bld.SAMBA3_LIBRARY('cli_spoolss',
                    source=LIBCLI_SPOOLSS_SRC,
-                   deps='RPC_NDR_SPOOLSS param SECRETS3',
+                   deps='RPC_NDR_SPOOLSS param secrets3',
                    private_library=True)
 
 bld.SAMBA3_SUBSYSTEM('LIBCLI_WINREG',
@@ -1359,7 +1363,7 @@ bld.SAMBA3_BINARY('smbta-util',
                  source=SMBTA_UTIL_SRC,
                  deps='''
                  talloc
-                 SECRETS3
+                 secrets3
                  param''',
                  vars=locals())