Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 323 insertions, 0 deletions

diff --git a/source3/libads/authdata.c b/source3/libads/authdata.c
new file mode 100644
index 0000000..10adc3e
--- /dev/null
+++ b/source3/libads/authdata.c
@@ -0,0 +1,323 @@
+/*
+   Unix SMB/CIFS implementation.
+   kerberos authorization data (PAC) utility library
+   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+   Copyright (C) Andrew Tridgell 2001
+   Copyright (C) Luke Howard 2002-2003
+   Copyright (C) Stefan Metzmacher 2004-2005
+   Copyright (C) Guenther Deschner 2005,2007,2008
+
+   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 "librpc/gen_ndr/ndr_krb5pac.h"
+#include "smb_krb5.h"
+#include "libads/kerberos_proto.h"
+#include "auth/common_auth.h"
+#include "lib/param/param.h"
+#include "librpc/crypto/gse.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h" /* TODO: remove this */
+#include "../libcli/auth/spnego.h"
+#include "lib/util/asn1.h"
+
+#ifdef HAVE_KRB5
+
+#include "auth/kerberos/pac_utils.h"
+
+struct smb_krb5_context;
+
+/*
+  generate a krb5 GSS-API wrapper packet given a ticket
+*/
+static DATA_BLOB spnego_gen_krb5_wrap(
+	TALLOC_CTX *ctx, const DATA_BLOB ticket, const uint8_t tok_id[2])
+{
+	ASN1_DATA *data;
+	DATA_BLOB ret = data_blob_null;
+
+	data = asn1_init(talloc_tos(), ASN1_MAX_TREE_DEPTH);
+	if (data == NULL) {
+		return data_blob_null;
+	}
+
+	if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
+	if (!asn1_write_OID(data, OID_KERBEROS5)) goto err;
+
+	if (!asn1_write(data, tok_id, 2)) goto err;
+	if (!asn1_write(data, ticket.data, ticket.length)) goto err;
+	if (!asn1_pop_tag(data)) goto err;
+
+	if (!asn1_extract_blob(data, ctx, &ret)) {
+		goto err;
+	}
+
+	asn1_free(data);
+	data = NULL;
+
+  err:
+
+	if (data != NULL) {
+		if (asn1_has_error(data)) {
+			DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
+				  (int)asn1_current_ofs(data)));
+		}
+
+		asn1_free(data);
+	}
+
+	return ret;
+}
+
+/*
+ * Given the username/password, do a kinit, store the ticket in
+ * cache_name if specified, and return the PAC_LOGON_INFO (the
+ * structure containing the important user information such as
+ * groups).
+ */
+NTSTATUS kerberos_return_pac(TALLOC_CTX *mem_ctx,
+			     const char *name,
+			     const char *pass,
+			     time_t time_offset,
+			     time_t *expire_time,
+			     time_t *renew_till_time,
+			     const char *cache_name,
+			     bool request_pac,
+			     bool add_netbios_addr,
+			     time_t renewable_time,
+			     const char *impersonate_princ_s,
+			     const char *local_service,
+			     char **_canon_principal,
+			     char **_canon_realm,
+			     struct PAC_DATA_CTR **_pac_data_ctr)
+{
+	krb5_error_code ret;
+	NTSTATUS status = NT_STATUS_INVALID_PARAMETER;
+	DATA_BLOB tkt = data_blob_null;
+	DATA_BLOB tkt_wrapped = data_blob_null;
+	DATA_BLOB ap_rep = data_blob_null;
+	DATA_BLOB sesskey1 = data_blob_null;
+	const char *auth_princ = NULL;
+	const char *cc = "MEMORY:kerberos_return_pac";
+	struct auth_session_info *session_info;
+	struct gensec_security *gensec_server_context;
+	const struct gensec_security_ops **backends;
+	struct gensec_settings *gensec_settings;
+	size_t idx = 0;
+	struct auth4_context *auth_context;
+	struct loadparm_context *lp_ctx;
+	struct PAC_DATA_CTR *pac_data_ctr = NULL;
+	char *canon_principal = NULL;
+	char *canon_realm = NULL;
+
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+	ZERO_STRUCT(tkt);
+	ZERO_STRUCT(ap_rep);
+	ZERO_STRUCT(sesskey1);
+
+	if (!name || !pass) {
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto out;
+	}
+
+	if (_canon_principal != NULL) {
+		*_canon_principal = NULL;
+	}
+
+	if (_canon_realm != NULL) {
+		*_canon_realm = NULL;
+	}
+
+	if (cache_name) {
+		cc = cache_name;
+	}
+
+	if (!strchr_m(name, '@')) {
+		auth_princ = talloc_asprintf(mem_ctx, "%s@%s", name,
+			lp_realm());
+	} else {
+		auth_princ = name;
+	}
+	NT_STATUS_HAVE_NO_MEMORY(auth_princ);
+
+	ret = kerberos_kinit_password_ext(auth_princ,
+					  pass,
+					  time_offset,
+					  expire_time,
+					  renew_till_time,
+					  cc,
+					  request_pac,
+					  add_netbios_addr,
+					  renewable_time,
+					  tmp_ctx,
+					  &canon_principal,
+					  &canon_realm,
+					  &status);
+	if (ret) {
+		DEBUG(1,("kinit failed for '%s' with: %s (%d)\n",
+			auth_princ, error_message(ret), ret));
+		/* status already set */
+		goto out;
+	}
+
+	DEBUG(10,("got TGT for %s in %s\n", auth_princ, cc));
+	if (expire_time) {
+		DEBUGADD(10,("\tvalid until: %s (%d)\n",
+			http_timestring(talloc_tos(), *expire_time),
+			(int)*expire_time));
+	}
+	if (renew_till_time) {
+		DEBUGADD(10,("\trenewable till: %s (%d)\n",
+			http_timestring(talloc_tos(), *renew_till_time),
+			(int)*renew_till_time));
+	}
+
+	/* we cannot continue with krb5 when UF_DONT_REQUIRE_PREAUTH is set,
+	 * in that case fallback to NTLM - gd */
+
+	if (expire_time && renew_till_time &&
+	    (*expire_time == 0) && (*renew_till_time == 0)) {
+		status = NT_STATUS_INVALID_LOGON_TYPE;
+		goto out;
+	}
+
+	ret = ads_krb5_cli_get_ticket(mem_ctx,
+				      local_service,
+				      time_offset,
+				      &tkt,
+				      &sesskey1,
+				      0,
+				      cc,
+				      NULL,
+				      impersonate_princ_s);
+	if (ret) {
+		DEBUG(1,("failed to get ticket for %s: %s\n",
+			local_service, error_message(ret)));
+		if (impersonate_princ_s) {
+			DEBUGADD(1,("tried S4U2SELF impersonation as: %s\n",
+				impersonate_princ_s));
+		}
+		status = krb5_to_nt_status(ret);
+		goto out;
+	}
+
+	/* wrap that up in a nice GSS-API wrapping */
+	tkt_wrapped = spnego_gen_krb5_wrap(tmp_ctx, tkt, TOK_ID_KRB_AP_REQ);
+	if (tkt_wrapped.data == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto out;
+	}
+
+	auth_context = auth4_context_for_PAC_DATA_CTR(tmp_ctx);
+	if (auth_context == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto out;
+	}
+
+	lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
+	if (lp_ctx == NULL) {
+		status = NT_STATUS_INVALID_SERVER_STATE;
+		DEBUG(10, ("loadparm_init_s3 failed\n"));
+		goto out;
+	}
+
+	gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
+	if (gensec_settings == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		DEBUG(10, ("lpcfg_gensec_settings failed\n"));
+		goto out;
+	}
+
+	backends = talloc_zero_array(gensec_settings,
+				     const struct gensec_security_ops *, 2);
+	if (backends == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto out;
+	}
+	gensec_settings->backends = backends;
+
+	gensec_init();
+
+	backends[idx++] = &gensec_gse_krb5_security_ops;
+
+	status = gensec_server_start(tmp_ctx, gensec_settings,
+					auth_context, &gensec_server_context);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, (__location__ "Failed to start server-side GENSEC to validate a Kerberos ticket: %s\n", nt_errstr(status)));
+		goto out;
+	}
+
+	talloc_unlink(tmp_ctx, lp_ctx);
+	talloc_unlink(tmp_ctx, gensec_settings);
+	talloc_unlink(tmp_ctx, auth_context);
+
+	/* Session info is not complete, do not pass to auth log */
+	gensec_want_feature(gensec_server_context, GENSEC_FEATURE_NO_AUTHZ_LOG);
+
+	status = gensec_start_mech_by_oid(gensec_server_context, GENSEC_OID_KERBEROS5);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, (__location__ "Failed to start server-side GENSEC krb5 to validate a Kerberos ticket: %s\n", nt_errstr(status)));
+		goto out;
+	}
+
+	/* Do a client-server update dance */
+	status = gensec_update(gensec_server_context, tmp_ctx, tkt_wrapped, &ap_rep);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("gensec_update() failed: %s\n", nt_errstr(status)));
+		goto out;
+	}
+
+	/* Now return the PAC information to the callers.  We ignore
+	 * the session_info and instead pick out the PAC via the
+	 * private_data on the auth_context */
+	status = gensec_session_info(gensec_server_context, tmp_ctx, &session_info);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Unable to obtain PAC via gensec_session_info\n"));
+		goto out;
+	}
+
+	pac_data_ctr = auth4_context_get_PAC_DATA_CTR(auth_context, mem_ctx);
+	if (pac_data_ctr == NULL) {
+		DEBUG(1,("no PAC\n"));
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto out;
+	}
+
+	*_pac_data_ctr = talloc_move(mem_ctx, &pac_data_ctr);
+	if (_canon_principal != NULL) {
+		*_canon_principal = talloc_move(mem_ctx, &canon_principal);
+	}
+	if (_canon_realm != NULL) {
+		*_canon_realm = talloc_move(mem_ctx, &canon_realm);
+	}
+
+out:
+	talloc_free(tmp_ctx);
+	if (cc != cache_name) {
+		ads_kdestroy(cc);
+	}
+
+	data_blob_free(&tkt);
+	data_blob_free(&ap_rep);
+	data_blob_free(&sesskey1);
+
+	return status;
+}
+
+#endif