Don't require "Modify property" perms to unjoin (bug #6481) "net ads leave" stopped working when "modify properties" permissions were not granted (meaning you had to be allowed to disable the account that you were about to delete).

Libnetapi should not delete machine accounts, as this does not
happen on win32.  The WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE flag
really means "disable" (both in practice and docs).

However, to keep the functionality in "net ads leave", we
will still try to do the delete.  If this fails, we try
to do the disable.

Additionally, it is possible in windows to not disable or
delete the account, but just tell the local machine that it
is no longer in the account.  libnet can now do this as well.

Don't use ads realm name for non-ads case.  #6481

Also check that the connection to ads worked.

6 files changed, 55 insertions, 21 deletions

diff --git a/source/lib/netapi/joindomain.c b/source/lib/netapi/joindomain.c
index 66f7cfb13ff..c204a809716 100644
--- a/source/lib/netapi/joindomain.c
+++ b/source/lib/netapi/joindomain.c
@@ -209,6 +209,7 @@ WERROR NetUnjoinDomain_l(struct libnetapi_ctx *mem_ctx,
 
 	u->in.domain_name = domain;
 	u->in.unjoin_flags = r->in.unjoin_flags;
+	u->in.delete_machine_account = false;
 	u->in.modify_config = true;
 	u->in.debug = true;
 
diff --git a/source/libnet/libnet_join.c b/source/libnet/libnet_join.c
index c13ac9b769e..face9d3a35b 100644
--- a/source/libnet/libnet_join.c
+++ b/source/libnet/libnet_join.c
@@ -1835,6 +1835,12 @@ static WERROR libnet_DomainUnjoin(TALLOC_CTX *mem_ctx,
 		W_ERROR_HAVE_NO_MEMORY(r->in.domain_sid);
 	}
 
+	if (!(r->in.unjoin_flags & WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE) &&
+	    !r->in.delete_machine_account) {
+		libnet_join_unjoindomain_remove_secrets(mem_ctx, r);
+		return WERR_OK;
+	}
+
 	if (!r->in.dc_name) {
 		struct netr_DsRGetDCNameInfo *info;
 		const char *dc;
@@ -1860,38 +1866,55 @@ static WERROR libnet_DomainUnjoin(TALLOC_CTX *mem_ctx,
 		W_ERROR_HAVE_NO_MEMORY(r->in.dc_name);
 	}
 
-	status = libnet_join_unjoindomain_rpc(mem_ctx, r);
-	if (!NT_STATUS_IS_OK(status)) {
-		libnet_unjoin_set_error_string(mem_ctx, r,
-			"failed to disable machine account via rpc: %s",
-			get_friendly_nt_error_msg(status));
-		if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
-			return WERR_SETUP_NOT_JOINED;
-		}
-		return ntstatus_to_werror(status);
-	}
-
-	r->out.disabled_machine_account = true;
-
 #ifdef WITH_ADS
-	if (r->in.unjoin_flags & WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE) {
+	/* for net ads leave, try to delete the account.  If it works,
+	   no sense in disabling.  If it fails, we can still try to
+	   disable it. jmcd */
+
+	if (r->in.delete_machine_account) {
 		ADS_STATUS ads_status;
-		libnet_unjoin_connect_ads(mem_ctx, r);
-		ads_status = libnet_unjoin_remove_machine_acct(mem_ctx, r);
+		ads_status = libnet_unjoin_connect_ads(mem_ctx, r);
+		if (ADS_ERR_OK(ads_status)) {
+			/* dirty hack */
+			r->out.dns_domain_name =
+				talloc_strdup(mem_ctx,
+					      r->in.ads->server.realm);
+			ads_status =
+				libnet_unjoin_remove_machine_acct(mem_ctx, r);
+		}
 		if (!ADS_ERR_OK(ads_status)) {
 			libnet_unjoin_set_error_string(mem_ctx, r,
 				"failed to remove machine account from AD: %s",
 				ads_errstr(ads_status));
 		} else {
 			r->out.deleted_machine_account = true;
-			/* dirty hack */
-			r->out.dns_domain_name = talloc_strdup(mem_ctx,
-							       r->in.ads->server.realm);
 			W_ERROR_HAVE_NO_MEMORY(r->out.dns_domain_name);
+			libnet_join_unjoindomain_remove_secrets(mem_ctx, r);
+			return WERR_OK;
 		}
 	}
 #endif /* WITH_ADS */
 
+	/* The WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE flag really means
+	   "disable".  */
+	if (r->in.unjoin_flags & WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE) {
+		status = libnet_join_unjoindomain_rpc(mem_ctx, r);
+		if (!NT_STATUS_IS_OK(status)) {
+			libnet_unjoin_set_error_string(mem_ctx, r,
+				"failed to disable machine account via rpc: %s",
+				get_friendly_nt_error_msg(status));
+			if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
+				return WERR_SETUP_NOT_JOINED;
+			}
+			return ntstatus_to_werror(status);
+		}
+
+		r->out.disabled_machine_account = true;
+	}
+
+	/* If disable succeeded or was not requested at all, we
+	   should be getting rid of our end of things */
+
 	libnet_join_unjoindomain_remove_secrets(mem_ctx, r);
 
 	return WERR_OK;
diff --git a/source/librpc/gen_ndr/libnet_join.h b/source/librpc/gen_ndr/libnet_join.h
index e5ec438bb58..0de71323248 100644
--- a/source/librpc/gen_ndr/libnet_join.h
+++ b/source/librpc/gen_ndr/libnet_join.h
@@ -56,6 +56,7 @@ struct libnet_UnjoinCtx {
 		const char * admin_password;
 		const char * machine_password;
 		uint32_t unjoin_flags;
+		uint8_t delete_machine_account;
 		uint8_t modify_config;
 		struct dom_sid *domain_sid;/* [ref] */
 		struct ads_struct *ads;/* [ref] */
diff --git a/source/librpc/gen_ndr/ndr_libnet_join.c b/source/librpc/gen_ndr/ndr_libnet_join.c
index 753859f0ed7..a550cd61104 100644
--- a/source/librpc/gen_ndr/ndr_libnet_join.c
+++ b/source/librpc/gen_ndr/ndr_libnet_join.c
@@ -87,6 +87,7 @@ _PUBLIC_ void ndr_print_libnet_UnjoinCtx(struct ndr_print *ndr, const char *name
 		ndr_print_ptr(ndr, "machine_password", r->in.machine_password);
 #endif
 		ndr_print_wkssvc_joinflags(ndr, "unjoin_flags", r->in.unjoin_flags);
+		ndr_print_uint8(ndr, "delete_machine_account", r->in.delete_machine_account);
 		ndr_print_uint8(ndr, "modify_config", r->in.modify_config);
 		ndr_print_ptr(ndr, "domain_sid", r->in.domain_sid);
 		ndr->depth++;
diff --git a/source/librpc/idl/libnet_join.idl b/source/librpc/idl/libnet_join.idl
index 7f6e3464556..93b1f0989f7 100644
--- a/source/librpc/idl/libnet_join.idl
+++ b/source/librpc/idl/libnet_join.idl
@@ -51,6 +51,7 @@ interface libnetjoin
 		[in] string admin_password,
 		[in] string machine_password,
 		[in] wkssvc_joinflags unjoin_flags,
+		[in] boolean8 delete_machine_account,
 		[in] boolean8 modify_config,
 		[in] dom_sid *domain_sid,
 		[in] ads_struct *ads,
diff --git a/source/utils/net_ads.c b/source/utils/net_ads.c
index a023a11a066..3c27b4ccb2a 100644
--- a/source/utils/net_ads.c
+++ b/source/utils/net_ads.c
@@ -835,8 +835,12 @@ static int net_ads_leave(int argc, const char **argv)
 	r->in.admin_account	= opt_user_name;
 	r->in.admin_password	= net_prompt_pass(opt_user_name);
 	r->in.modify_config	= lp_config_backend_is_registry();
+
+	/* Try to delete it, but if that fails, disable it.  The
+	   WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE really means "disable */
 	r->in.unjoin_flags	= WKSSVC_JOIN_FLAGS_JOIN_TYPE |
 				  WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE;
+	r->in.delete_machine_account = true;
 
 	werr = libnet_Unjoin(ctx, r);
 	if (!W_ERROR_IS_OK(werr)) {
@@ -846,7 +850,7 @@ static int net_ads_leave(int argc, const char **argv)
 		goto done;
 	}
 
-	if (W_ERROR_IS_OK(werr)) {
+	if (r->out.deleted_machine_account) {
 		d_printf("Deleted account for '%s' in realm '%s'\n",
 			r->in.machine_name, r->out.dns_domain_name);
 		goto done;
@@ -860,7 +864,10 @@ static int net_ads_leave(int argc, const char **argv)
 		goto done;
 	}
 
-	d_fprintf(stderr, "Failed to disable machine account for '%s' in realm '%s'\n",
+	/* Based on what we requseted, we shouldn't get here, but if
+	   we did, it means the secrets were removed, and therefore
+	   we have left the domain */
+	d_fprintf(stderr, "Machine '%s' Left domain '%s'\n",
 		  r->in.machine_name, r->out.dns_domain_name);
 
  done: