Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

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

1 files changed, 427 insertions, 0 deletions

diff --git a/source4/auth/session.c b/source4/auth/session.c
new file mode 100644
index 0000000..34ad557
--- /dev/null
+++ b/source4/auth/session.c
@@ -0,0 +1,427 @@
+/* 
+   Unix SMB/CIFS implementation.
+   Authentication utility functions
+   Copyright (C) Andrew Tridgell 1992-1998
+   Copyright (C) Andrew Bartlett 2001-2010
+   Copyright (C) Jeremy Allison 2000-2001
+   Copyright (C) Rafal Szczesniak 2002
+   Copyright (C) Stefan Metzmacher 2005
+
+   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 "auth/auth.h"
+#include "auth/auth_sam.h"
+#include "auth/credentials/credentials.h"
+#include "auth/credentials/credentials_krb5.h"
+#include "libcli/security/security.h"
+#include "libcli/auth/libcli_auth.h"
+#include "dsdb/samdb/samdb.h"
+#include "auth/session_proto.h"
+#include "system/kerberos.h"
+#include <gssapi/gssapi.h>
+#include "libcli/wbclient/wbclient.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+_PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx, 
+					    struct loadparm_context *lp_ctx)
+{
+	NTSTATUS nt_status;
+	struct auth_session_info *session_info = NULL;
+	nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return NULL;
+	}
+	return session_info;
+}
+
+_PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
+					     struct loadparm_context *lp_ctx, /* Optional, if you don't want privilages */
+					     struct ldb_context *sam_ctx, /* Optional, if you don't want local groups */
+					     struct auth_user_info_dc *user_info_dc,
+					     uint32_t session_info_flags,
+					     struct auth_session_info **_session_info)
+{
+	struct auth_session_info *session_info;
+	NTSTATUS nt_status;
+	unsigned int i, num_sids = 0;
+
+	const char *filter;
+
+	struct dom_sid *sids = NULL;
+	const struct dom_sid *anonymous_sid, *system_sid;
+
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
+
+	session_info = talloc_zero(tmp_ctx, struct auth_session_info);
+	if (session_info == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	session_info->info = talloc_reference(session_info, user_info_dc->info);
+
+	session_info->torture = talloc_zero(session_info, struct auth_user_info_torture);
+	if (session_info->torture == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+	session_info->torture->num_dc_sids = user_info_dc->num_sids;
+	session_info->torture->dc_sids = talloc_reference(session_info, user_info_dc->sids);
+	if (session_info->torture->dc_sids == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	/* unless set otherwise, the session key is the user session
+	 * key from the auth subsystem */ 
+	session_info->session_key = data_blob_talloc(session_info, user_info_dc->user_session_key.data, user_info_dc->user_session_key.length);
+	if (!session_info->session_key.data && session_info->session_key.length) {
+		if (session_info->session_key.data == NULL) {
+			TALLOC_FREE(tmp_ctx);
+			return NT_STATUS_NO_MEMORY;
+		}
+	}
+
+	anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
+	if (anonymous_sid == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
+	if (system_sid == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	sids = talloc_array(tmp_ctx, struct dom_sid, user_info_dc->num_sids);
+	if (sids == NULL) {
+		TALLOC_FREE(tmp_ctx);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	num_sids = user_info_dc->num_sids;
+
+	for (i=0; i < user_info_dc->num_sids; i++) {
+		sids[i] = user_info_dc->sids[i];
+	}
+
+	/*
+	 * Finally add the "standard" sids.
+	 * The only difference between guest and "anonymous"
+	 * is the addition of Authenticated_Users.
+	 */
+
+	if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
+		sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 2);
+		if (sids == NULL) {
+			TALLOC_FREE(tmp_ctx);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		sid_copy(&sids[num_sids], &global_sid_World);
+		num_sids++;
+
+		sid_copy(&sids[num_sids], &global_sid_Network);
+		num_sids++;
+	}
+
+	if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
+		sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
+		if (sids == NULL) {
+			TALLOC_FREE(tmp_ctx);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		sid_copy(&sids[num_sids], &global_sid_Authenticated_Users);
+		num_sids++;
+	}
+
+	if (session_info_flags & AUTH_SESSION_INFO_NTLM) {
+		sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
+		if (sids == NULL) {
+			TALLOC_FREE(tmp_ctx);
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		if (!dom_sid_parse(SID_NT_NTLM_AUTHENTICATION, &sids[num_sids])) {
+			TALLOC_FREE(tmp_ctx);
+			return NT_STATUS_INTERNAL_ERROR;
+		}
+		num_sids++;
+	}
+
+
+	if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(anonymous_sid, &sids[PRIMARY_USER_SID_INDEX])) {
+		/* Don't expand nested groups of system, anonymous etc*/
+	} else if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(system_sid, &sids[PRIMARY_USER_SID_INDEX])) {
+		/* Don't expand nested groups of system, anonymous etc*/
+	} else if (sam_ctx) {
+		filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
+					 GROUP_TYPE_BUILTIN_LOCAL_GROUP);
+
+		/* Search for each group in the token */
+		for (i = 0; i < num_sids; i++) {
+			struct dom_sid_buf buf;
+			const char *sid_dn;
+			DATA_BLOB sid_blob;
+
+			sid_dn = talloc_asprintf(
+				tmp_ctx,
+				"<SID=%s>",
+				dom_sid_str_buf(&sids[i], &buf));
+			if (sid_dn == NULL) {
+				TALLOC_FREE(tmp_ctx);
+				return NT_STATUS_NO_MEMORY;
+			}
+			sid_blob = data_blob_string_const(sid_dn);
+
+			/* This function takes in memberOf values and expands
+			 * them, as long as they meet the filter - so only
+			 * builtin groups
+			 *
+			 * We already have the SID in the token, so set
+			 * 'only childs' flag to true */
+			nt_status = dsdb_expand_nested_groups(sam_ctx, &sid_blob, true, filter,
+							      tmp_ctx, &sids, &num_sids);
+			if (!NT_STATUS_IS_OK(nt_status)) {
+				talloc_free(tmp_ctx);
+				return nt_status;
+			}
+		}
+	}
+
+	nt_status = security_token_create(session_info,
+					  lp_ctx,
+					  num_sids,
+					  sids,
+					  session_info_flags,
+					  &session_info->security_token);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		TALLOC_FREE(tmp_ctx);
+		return nt_status;
+	}
+
+	session_info->unique_session_token = GUID_random();
+
+	session_info->credentials = NULL;
+
+	session_info->ticket_type = user_info_dc->ticket_type;
+
+	talloc_steal(mem_ctx, session_info);
+	*_session_info = session_info;
+	talloc_free(tmp_ctx);
+	return NT_STATUS_OK;
+}
+
+
+/* Fill out the auth_session_info with a cli_credentials based on the
+ * auth_session_info we were forwarded over named pipe forwarding.
+ *
+ * NOTE: The stucture members of session_info_transport are stolen
+ * with talloc_move() into auth_session_info for long term use
+ */
+struct auth_session_info *auth_session_info_from_transport(TALLOC_CTX *mem_ctx,
+							   struct auth_session_info_transport *session_info_transport,
+							   struct loadparm_context *lp_ctx,
+							   const char **reason)
+{
+	struct auth_session_info *session_info;
+	session_info = talloc_steal(mem_ctx, session_info_transport->session_info);
+	/*
+	 * This is to allow us to check the type of this pointer using
+	 * talloc_get_type()
+	 */
+	talloc_set_name(session_info, "struct auth_session_info");
+#ifdef HAVE_GSS_IMPORT_CRED
+	if (session_info_transport->exported_gssapi_credentials.length) {
+		struct cli_credentials *creds;
+		OM_uint32 minor_status;
+		gss_buffer_desc cred_token;
+		gss_cred_id_t cred_handle;
+		const char *error_string;
+		int ret;
+		bool ok;
+
+		DEBUG(10, ("Delegated credentials supplied by client\n"));
+
+		cred_token.value = session_info_transport->exported_gssapi_credentials.data;
+		cred_token.length = session_info_transport->exported_gssapi_credentials.length;
+
+		ret = gss_import_cred(&minor_status,
+				      &cred_token,
+				      &cred_handle);
+		if (ret != GSS_S_COMPLETE) {
+			*reason = "Internal error in gss_import_cred()";
+			return NULL;
+		}
+
+		creds = cli_credentials_init(session_info);
+		if (!creds) {
+			*reason = "Out of memory in cli_credentials_init()";
+			return NULL;
+		}
+		session_info->credentials = creds;
+
+		ok = cli_credentials_set_conf(creds, lp_ctx);
+		if (!ok) {
+			*reason = "Failed to load smb.conf";
+			return NULL;
+		}
+
+		/* Just so we don't segfault trying to get at a username */
+		cli_credentials_set_anonymous(creds);
+
+		ret = cli_credentials_set_client_gss_creds(creds,
+							   lp_ctx,
+							   cred_handle,
+							   CRED_SPECIFIED,
+							   &error_string);
+		if (ret) {
+			*reason = talloc_asprintf(mem_ctx,
+						  "Failed to set pipe forwarded"
+						  "creds: %s\n", error_string);
+			return NULL;
+		}
+
+		/* This credential handle isn't useful for password
+		 * authentication, so ensure nobody tries to do that */
+		cli_credentials_set_kerberos_state(creds,
+						   CRED_USE_KERBEROS_REQUIRED,
+						   CRED_SPECIFIED);
+
+	}
+#endif
+	return session_info;
+}
+
+
+/* Create a auth_session_info_transport from an auth_session_info.
+ *
+ * NOTE: Members of the auth_session_info_transport structure are
+ * talloc_referenced() into this structure, and should not be changed.
+ */
+NTSTATUS auth_session_info_transport_from_session(TALLOC_CTX *mem_ctx,
+						  struct auth_session_info *session_info,
+						  struct tevent_context *event_ctx,
+						  struct loadparm_context *lp_ctx,
+						  struct auth_session_info_transport **transport_out)
+{
+
+	struct auth_session_info_transport *session_info_transport
+		= talloc_zero(mem_ctx, struct auth_session_info_transport);
+	if (!session_info_transport) {
+		return NT_STATUS_NO_MEMORY;
+	};
+	session_info_transport->session_info = talloc_reference(session_info_transport, session_info);
+	if (!session_info_transport->session_info) {
+		return NT_STATUS_NO_MEMORY;
+	};
+#ifdef HAVE_GSS_EXPORT_CRED
+	if (session_info->credentials) {
+		struct gssapi_creds_container *gcc;
+		OM_uint32 gret;
+		OM_uint32 minor_status;
+		gss_buffer_desc cred_token;
+		const char *error_string;
+		int ret;
+
+		ret = cli_credentials_get_client_gss_creds(session_info->credentials,
+							   event_ctx,
+							   lp_ctx,
+							   &gcc, &error_string);
+		if (ret != 0) {
+			*transport_out = session_info_transport;
+			return NT_STATUS_OK;
+		}
+
+		gret = gss_export_cred(&minor_status,
+				       gcc->creds,
+				       &cred_token);
+		if (gret != GSS_S_COMPLETE) {
+			return NT_STATUS_INTERNAL_ERROR;
+		}
+
+		if (cred_token.length) {
+			session_info_transport->exported_gssapi_credentials
+				= data_blob_talloc(session_info_transport,
+						   cred_token.value,
+						   cred_token.length);
+			gss_release_buffer(&minor_status, &cred_token);
+			NT_STATUS_HAVE_NO_MEMORY(session_info_transport->exported_gssapi_credentials.data);
+		}
+	}
+#endif
+	*transport_out = session_info_transport;
+	return NT_STATUS_OK;
+}
+
+
+/* Produce a session_info for an arbitary DN or principal in the local
+ * DB, assuming the local DB holds all the groups
+ *
+ * Supply either a principal or a DN
+ */
+NTSTATUS authsam_get_session_info_principal(TALLOC_CTX *mem_ctx,
+					    struct loadparm_context *lp_ctx,
+					    struct ldb_context *sam_ctx,
+					    const char *principal,
+					    struct ldb_dn *user_dn,
+					    uint32_t session_info_flags,
+					    struct auth_session_info **session_info)
+{
+	NTSTATUS nt_status;
+	struct auth_user_info_dc *user_info_dc;
+	TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+	if (!tmp_ctx) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	nt_status = authsam_get_user_info_dc_principal(tmp_ctx, lp_ctx, sam_ctx,
+						      principal, user_dn,
+						      &user_info_dc);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		talloc_free(tmp_ctx);
+		return nt_status;
+	}
+
+	nt_status = auth_generate_session_info(tmp_ctx, lp_ctx, sam_ctx,
+					       user_info_dc, session_info_flags,
+					       session_info);
+
+	if (NT_STATUS_IS_OK(nt_status)) {
+		talloc_steal(mem_ctx, *session_info);
+	}
+	talloc_free(tmp_ctx);
+	return nt_status;
+}
+
+/**
+ * prints a struct auth_session_info security token to debug output.
+ */
+void auth_session_info_debug(int dbg_lev, 
+			     const struct auth_session_info *session_info)
+{
+	if (!session_info) {
+		DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
+		return;	
+	}
+
+	security_token_debug(DBGC_AUTH, dbg_lev,
+			     session_info->security_token);
+}