1 files changed, 291 insertions, 0 deletions
diff --git a/source3/winbindd/winbindd_pam_auth.c b/source3/winbindd/winbindd_pam_auth.c
new file mode 100644
index 0000000..431da09
--- /dev/null
+++ b/source3/winbindd/winbindd_pam_auth.c
@@ -0,0 +1,291 @@
+/*
+   Unix SMB/CIFS implementation.
+   async implementation of WINBINDD_PAM_AUTH
+   Copyright (C) Volker Lendecke 2010
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "winbindd.h"
+#include "libcli/security/dom_sid.h"
+#include "lib/util/string_wrappers.h"
+#include "lib/global_contexts.h"
+#include "librpc/gen_ndr/ndr_winbind_c.h"
+
+static NTSTATUS fake_password_policy(struct winbindd_response *r,
+				     uint16_t validation_level,
+				     union netr_Validation  *validation)
+{
+	const struct netr_SamBaseInfo *bi = NULL;
+	NTTIME min_password_age;
+	NTTIME max_password_age;
+
+	switch (validation_level) {
+	case 3:
+		bi = &validation->sam3->base;
+		break;
+	case 6:
+		bi = &validation->sam6->base;
+		break;
+	default:
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	if (bi->allow_password_change > bi->last_password_change) {
+		min_password_age = bi->allow_password_change -
+				   bi->last_password_change;
+	} else {
+		min_password_age = 0;
+	}
+
+	if (bi->force_password_change > bi->last_password_change) {
+		max_password_age = bi->force_password_change -
+				   bi->last_password_change;
+	} else {
+		max_password_age = 0;
+	}
+
+	r->data.auth.policy.min_length_password = 0;
+	r->data.auth.policy.password_history = 0;
+	r->data.auth.policy.password_properties = 0;
+	r->data.auth.policy.expire =
+		nt_time_to_unix_abs(&max_password_age);
+	r->data.auth.policy.min_passwordage =
+		nt_time_to_unix_abs(&min_password_age);
+
+	return NT_STATUS_OK;
+}
+
+struct winbindd_pam_auth_state {
+	struct wbint_PamAuth *r;
+	char *name_namespace;
+	char *name_domain;
+	char *name_user;
+};
+
+static void winbindd_pam_auth_done(struct tevent_req *subreq);
+
+struct tevent_req *winbindd_pam_auth_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct winbindd_cli_state *cli,
+					  struct winbindd_request *request)
+{
+	struct tevent_req *req, *subreq;
+	struct winbindd_pam_auth_state *state;
+	struct winbindd_domain *domain;
+	char *mapped = NULL;
+	char *auth_user = NULL;
+	NTSTATUS status;
+	bool ok;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct winbindd_pam_auth_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	D_NOTICE("[%s (%u)] Winbind external command PAM_AUTH start.\n"
+		 "Authenticating user '%s'.\n",
+		 cli->client_name,
+		 (unsigned int)cli->pid,
+		 request->data.auth.user);
+
+	if (!check_request_flags(request->flags)) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
+		return tevent_req_post(req, ev);
+	}
+
+	/* Parse domain and username */
+
+	status = normalize_name_unmap(state, request->data.auth.user, &mapped);
+
+	/* If the name normalization changed something, copy it over the given
+	   name */
+
+	if (NT_STATUS_IS_OK(status)
+	    || NT_STATUS_EQUAL(status, NT_STATUS_FILE_RENAMED)) {
+		fstrcpy(request->data.auth.user, mapped);
+	}
+
+	auth_user = request->data.auth.user;
+	ok = canonicalize_username(state,
+				   &auth_user,
+				   &state->name_namespace,
+				   &state->name_domain,
+				   &state->name_user);
+	if (!ok) {
+		tevent_req_nterror(req, NT_STATUS_NO_SUCH_USER);
+		return tevent_req_post(req, ev);
+	}
+
+	fstrcpy(request->data.auth.user, auth_user);
+
+	domain = find_auth_domain(request->flags, state->name_namespace);
+	if (domain == NULL) {
+		tevent_req_nterror(req, NT_STATUS_NO_SUCH_USER);
+		return tevent_req_post(req, ev);
+	}
+
+	state->r = talloc_zero(state, struct wbint_PamAuth);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.client_name = talloc_strdup(
+			state->r, request->client_name);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.client_pid = request->pid;
+	state->r->in.flags = request->flags;
+
+	state->r->in.info = talloc_zero(state->r, struct wbint_AuthUserInfo);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.info->krb5_cc_type = talloc_strdup(
+			state->r, request->data.auth.krb5_cc_type);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.info->password = talloc_strdup(
+			state->r, request->data.auth.pass);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.info->username = talloc_strdup(
+			state->r, request->data.auth.user);
+	if (tevent_req_nomem(state->r, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->r->in.info->uid = request->data.auth.uid;
+
+	status = extra_data_to_sid_array(
+				request->data.auth.require_membership_of_sid,
+				state->r,
+				&state->r->in.require_membership_of_sid);
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = dcerpc_wbint_PamAuth_r_send(state,
+					     global_event_context(),
+					     dom_child_handle(domain),
+					     state->r);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, winbindd_pam_auth_done, req);
+	return req;
+}
+
+static void winbindd_pam_auth_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct winbindd_pam_auth_state *state = tevent_req_data(
+		req, struct winbindd_pam_auth_state);
+	NTSTATUS status;
+
+	status = dcerpc_wbint_PamAuth_r_recv(subreq, state);
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	if (tevent_req_nterror(req, state->r->out.result)) {
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+NTSTATUS winbindd_pam_auth_recv(struct tevent_req *req,
+				struct winbindd_response *response)
+{
+	struct winbindd_pam_auth_state *state = tevent_req_data(
+		req, struct winbindd_pam_auth_state);
+	NTSTATUS status;
+
+	D_NOTICE("Winbind external command PAM_AUTH end.\n");
+	if (tevent_req_is_nterror(req, &status)) {
+		set_auth_errors(response, status);
+		return status;
+	}
+
+	response->result = WINBINDD_PENDING;
+
+	status = append_auth_data(response,
+				  response,
+				  state->r->in.flags,
+				  state->r->out.validation->level,
+				  state->r->out.validation->validation,
+				  state->name_domain,
+				  state->name_user);
+	fstrcpy(response->data.auth.krb5ccname,
+		state->r->out.validation->krb5ccname);
+
+	if (state->r->in.flags & WBFLAG_PAM_INFO3_TEXT) {
+		bool ok;
+
+		ok = add_trusted_domain_from_auth(
+			state->r->out.validation->level,
+			&response->data.auth.info3,
+			&response->data.auth.info6);
+		if (!ok) {
+			DBG_ERR("add_trusted_domain_from_auth failed\n");
+			set_auth_errors(response, NT_STATUS_LOGON_FAILURE);
+			return NT_STATUS_LOGON_FAILURE;
+		}
+	}
+
+	if (state->r->in.flags & WBFLAG_PAM_CACHED_LOGIN) {
+
+		/* Store in-memory creds for single-signon using ntlm_auth. */
+
+		status = winbindd_add_memory_creds(
+			state->r->in.info->username,
+			state->r->in.info->uid,
+			state->r->in.info->password);
+		D_DEBUG("winbindd_add_memory_creds returned: %s\n",
+			   nt_errstr(status));
+	}
+
+	if (state->r->in.flags & WBFLAG_PAM_GET_PWD_POLICY) {
+		/*
+		 * WBFLAG_PAM_GET_PWD_POLICY is not used within
+		 * any Samba caller anymore.
+		 *
+		 * We just fake this based on the effective values
+		 * for the user, for legacy callers.
+		 */
+		status = fake_password_policy(response,
+				state->r->out.validation->level,
+				state->r->out.validation->validation);
+		if (!NT_STATUS_IS_OK(status)) {
+			DBG_ERR("Failed to fake password policy: %s\n",
+				nt_errstr(status));
+			set_auth_errors(response, status);
+			return status;
+		}
+	}
+
+	return NT_STATUS_OK;
+}