Relevant BUGIDs:

Purpose of commit: cleanup

Commit summary:
---------------

2006-07-24  David Quigley   <dpquigl@tycho.nsa.gov>

        * modules/pam_namespace/Makefile.am: Add pam_namespace.h.
        * modules/pam_namespace/pam_namespace.c: Move includes and
        data structure definitions from here ...
        * modules/pam_namespace/pam_namespace.h: ... here. New file.

        * modules/pam_namespace/pam_namespace.c: Move large sections
        of code into new functions.

Acked by Janak Desai <janak@us.ibm.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/modules/pam_namespace/pam_namespace.h b/modules/pam_namespace/pam_namespace.h
new file mode 100644
index 00000000..c918cff3
--- /dev/null
+++ b/modules/pam_namespace/pam_namespace.h
@@ -0,0 +1,135 @@
+/******************************************************************************
+ * A module for Linux-PAM that will set the default namespace after 
+ * establishing a session via PAM.
+ *
+ * (C) Copyright IBM Corporation 2005
+ * (C) Copyright Red Hat 2006
+ * All Rights Reserved.
+ *
+ * Written by: Janak Desai <janak@us.ibm.com>
+ * With Revisions by: Steve Grubb <sgrubb@redhat.com>
+ * Derived from a namespace setup patch by Chad Sellers <cdselle@tycho.nsa.gov>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
+ * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#if !(defined(linux))
+#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!!
+#endif
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <syslog.h>
+#include <dlfcn.h>
+#include <stdarg.h>
+#include <pwd.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <sys/mount.h>
+#include <sys/wait.h>
+#include <libgen.h>
+#include <fcntl.h>
+#include <sched.h>
+#include "security/pam_modules.h"
+#include "security/pam_modutil.h"
+#include "security/pam_ext.h"
+#include "md5.h"
+
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#endif
+
+#ifndef CLONE_NEWNS
+#define CLONE_NEWNS 0x00020000 /* Flag to create new namespace */
+#endif
+
+/*
+ * Module defines
+ */
+#ifndef PAM_NAMESPACE_CONFIG
+#define PAM_NAMESPACE_CONFIG "/etc/security/namespace.conf"
+#endif
+
+#ifndef NAMESPACE_INIT_SCRIPT
+#define NAMESPACE_INIT_SCRIPT "/etc/security/namespace.init"
+#endif
+
+#define PAMNS_DEBUG           0x00000100 /* Running in debug mode */
+#define PAMNS_SELINUX_ENABLED 0x00000400 /* SELinux is enabled */
+#define PAMNS_CTXT_BASED_INST 0x00000800 /* Context based instance needed */
+#define PAMNS_GEN_HASH        0x00002000 /* Generate md5 hash for inst names */
+#define PAMNS_IGN_CONFIG_ERR  0x00004000 /* Ignore format error in conf file */
+#define PAMNS_IGN_INST_PARENT_MODE  0x00008000 /* Ignore instance parent mode */
+
+/*
+ * Polyinstantiation method options, based on user, security context
+ * or both
+ */
+enum polymethod {
+    USER,
+    CONTEXT,
+    BOTH,
+};
+
+/*
+ * Depending on the application using this namespace module, we
+ * may need to unmount priviously bind mounted instance directory.
+ * Applications such as login and sshd, that establish a new 
+ * session unmount of instance directory is not needed. For applications
+ * such as su and newrole, that switch the identity, this module 
+ * has to unmount previous instance directory first and re-mount
+ * based on the new indentity. For other trusted applications that
+ * just want to undo polyinstantiation, only unmount of previous
+ * instance directory is needed.
+ */
+enum unmnt_op {
+    NO_UNMNT,
+    UNMNT_REMNT,
+    UNMNT_ONLY,
+};
+
+/*
+ * Structure that holds information about a directory to polyinstantiate
+ */
+struct polydir_s {
+    char dir[PATH_MAX];    	       	/* directory to polyinstantiate */
+    char instance_prefix[PATH_MAX];	/* prefix for instance dir path name */
+    enum polymethod method;		/* method used to polyinstantiate */
+    unsigned int num_uids;		/* number of override uids */
+    uid_t *uid;				/* list of override uids */
+    struct polydir_s *next;		/* pointer to the next polydir entry */
+};
+
+struct instance_data {
+    pam_handle_t *pamh;		/* The pam handle for this instance */
+    struct polydir_s *polydirs_ptr; /* The linked list pointer */
+    char user[LOGIN_NAME_MAX];	/* User name */
+    uid_t uid;			/* The uid of the user */
+    unsigned long flags;		/* Flags for debug, selinux etc */
+};