--- /dev/null
+/*
+ * Linux Security plug
+ *
+ * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
+ * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
+ * Copyright (C) 2001 James Morris <jmorris@intercode.com.au>
+ * Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group)
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Due to this file being licensed under the GPL there is controversy over
+ * whether this permits you to write a module that #includes this file
+ * without placing your module under the GPL. Please consult a lawyer for
+ * advice before doing this.
+ *
+ */
+
+#ifndef __LINUX_SECURITY_H
+#define __LINUX_SECURITY_H
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/binfmts.h>
+#include <linux/signal.h>
+#include <linux/resource.h>
+#include <linux/sem.h>
+#include <linux/sysctl.h>
+#include <linux/shm.h>
+#include <linux/msg.h>
+
+/*
+ * Values used in the task_security_ops calls
+ */
+/* setuid or setgid, id0 == uid or gid */
+#define LSM_SETID_ID 1
+
+/* setreuid or setregid, id0 == real, id1 == eff */
+#define LSM_SETID_RE 2
+
+/* setresuid or setresgid, id0 == real, id1 == eff, uid2 == saved */
+#define LSM_SETID_RES 4
+
+/* setfsuid or setfsgid, id0 == fsuid or fsgid */
+#define LSM_SETID_FS 8
+
+/* forward declares to avoid warnings */
+struct sk_buff;
+struct net_device;
+struct nfsctl_arg;
+struct sched_param;
+struct swap_info_struct;
+
+/**
+ * struct security_operations - main security structure
+ *
+ * Security hooks for program execution operations.
+ *
+ * @bprm_alloc_security:
+ * Allocate and attach a security structure to the @bprm->security field.
+ * The security field is initialized to NULL when the bprm structure is
+ * allocated.
+ * @bprm contains the linux_binprm structure to be modified.
+ * Return 0 if operation was successful.
+ * @bprm_free_security:
+ * @bprm contains the linux_binprm structure to be modified.
+ * Deallocate and clear the @bprm->security field.
+ * @bprm_compute_creds:
+ * Compute and set the security attributes of a process being transformed
+ * by an execve operation based on the old attributes (current->security)
+ * and the information saved in @bprm->security by the set_security hook.
+ * Since this hook function (and its caller) are void, this hook can not
+ * return an error. However, it can leave the security attributes of the
+ * process unchanged if an access failure occurs at this point. It can
+ * also perform other state changes on the process (e.g. closing open
+ * file descriptors to which access is no longer granted if the attributes
+ * were changed).
+ * @bprm contains the linux_binprm structure.
+ * @bprm_set_security:
+ * Save security information in the bprm->security field, typically based
+ * on information about the bprm->file, for later use by the compute_creds
+ * hook. This hook may also optionally check permissions (e.g. for
+ * transitions between security domains).
+ * This hook may be called multiple times during a single execve, e.g. for
+ * interpreters. The hook can tell whether it has already been called by
+ * checking to see if @bprm->security is non-NULL. If so, then the hook
+ * may decide either to retain the security information saved earlier or
+ * to replace it.
+ * @bprm contains the linux_binprm structure.
+ * Return 0 if the hook is successful and permission is granted.
+ * @bprm_check_security:
+ * This hook mediates the point when a search for a binary handler will
+ * begin. It allows a check the @bprm->security value which is set in
+ * the preceding set_security call. The primary difference from
+ * set_security is that the argv list and envp list are reliably
+ * available in @bprm. This hook may be called multiple times
+ * during a single execve; and in each pass set_security is called
+ * first.
+ * @bprm contains the linux_binprm structure.
+ * Return 0 if the hook is successful and permission is granted.
+ *
+ * Security hooks for task operations.
+ *
+ * @task_create:
+ * Check permission before creating a child process. See the clone(2)
+ * manual page for definitions of the @clone_flags.
+ * @clone_flags contains the flags indicating what should be shared.
+ * Return 0 if permission is granted.
+ * @task_alloc_security:
+ * @p contains the task_struct for child process.
+ * Allocate and attach a security structure to the p->security field. The
+ * security field is initialized to NULL when the task structure is
+ * allocated.
+ * Return 0 if operation was successful.
+ * @task_free_security:
+ * @p contains the task_struct for process.
+ * Deallocate and clear the p->security field.
+ * @task_setuid:
+ * Check permission before setting one or more of the user identity
+ * attributes of the current process. The @flags parameter indicates
+ * which of the set*uid system calls invoked this hook and how to
+ * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
+ * definitions at the beginning of this file for the @flags values and
+ * their meanings.
+ * @id0 contains a uid.
+ * @id1 contains a uid.
+ * @id2 contains a uid.
+ * @flags contains one of the LSM_SETID_* values.
+ * Return 0 if permission is granted.
+ * @task_post_setuid:
+ * Update the module's state after setting one or more of the user
+ * identity attributes of the current process. The @flags parameter
+ * indicates which of the set*uid system calls invoked this hook. If
+ * @flags is LSM_SETID_FS, then @old_ruid is the old fs uid and the other
+ * parameters are not used.
+ * @old_ruid contains the old real uid (or fs uid if LSM_SETID_FS).
+ * @old_euid contains the old effective uid (or -1 if LSM_SETID_FS).
+ * @old_suid contains the old saved uid (or -1 if LSM_SETID_FS).
+ * @flags contains one of the LSM_SETID_* values.
+ * Return 0 on success.
+ * @task_setgid:
+ * Check permission before setting one or more of the group identity
+ * attributes of the current process. The @flags parameter indicates
+ * which of the set*gid system calls invoked this hook and how to
+ * interpret the @id0, @id1, and @id2 parameters. See the LSM_SETID
+ * definitions at the beginning of this file for the @flags values and
+ * their meanings.
+ * @id0 contains a gid.
+ * @id1 contains a gid.
+ * @id2 contains a gid.
+ * @flags contains one of the LSM_SETID_* values.
+ * Return 0 if permission is granted.
+ * @task_setpgid:
+ * Check permission before setting the process group identifier of the
+ * process @p to @pgid.
+ * @p contains the task_struct for process being modified.
+ * @pgid contains the new pgid.
+ * Return 0 if permission is granted.
+ * @task_getpgid:
+ * Check permission before getting the process group identifier of the
+ * process @p.
+ * @p contains the task_struct for the process.
+ * Return 0 if permission is granted.
+ * @task_getsid:
+ * Check permission before getting the session identifier of the process
+ * @p.
+ * @p contains the task_struct for the process.
+ * Return 0 if permission is granted.
+ * @task_setgroups:
+ * Check permission before setting the supplementary group set of the
+ * current process to @grouplist.
+ * @gidsetsize contains the number of elements in @grouplist.
+ * @grouplist contains the array of gids.
+ * Return 0 if permission is granted.
+ * @task_setnice:
+ * Check permission before setting the nice value of @p to @nice.
+ * @p contains the task_struct of process.
+ * @nice contains the new nice value.
+ * Return 0 if permission is granted.
+ * @task_setrlimit:
+ * Check permission before setting the resource limits of the current
+ * process for @resource to @new_rlim. The old resource limit values can
+ * be examined by dereferencing (current->rlim + resource).
+ * @resource contains the resource whose limit is being set.
+ * @new_rlim contains the new limits for @resource.
+ * Return 0 if permission is granted.
+ * @task_setscheduler:
+ * Check permission before setting scheduling policy and/or parameters of
+ * process @p based on @policy and @lp.
+ * @p contains the task_struct for process.
+ * @policy contains the scheduling policy.
+ * @lp contains the scheduling parameters.
+ * Return 0 if permission is granted.
+ * @task_getscheduler:
+ * Check permission before obtaining scheduling information for process
+ * @p.
+ * @p contains the task_struct for process.
+ * Return 0 if permission is granted.
+ * @task_kill:
+ * Check permission before sending signal @sig to @p. @info can be NULL,
+ * the constant 1, or a pointer to a siginfo structure. If @info is 1 or
+ * SI_FROMKERNEL(info) is true, then the signal should be viewed as coming
+ * from the kernel and should typically be permitted.
+ * SIGIO signals are handled separately by the send_sigiotask hook in
+ * file_security_ops.
+ * @p contains the task_struct for process.
+ * @info contains the signal information.
+ * @sig contains the signal value.
+ * Return 0 if permission is granted.
+ * @task_wait:
+ * Check permission before allowing a process to reap a child process @p
+ * and collect its status information.
+ * @p contains the task_struct for process.
+ * Return 0 if permission is granted.
+ * @task_prctl:
+ * Check permission before performing a process control operation on the
+ * current process.
+ * @option contains the operation.
+ * @arg2 contains a argument.
+ * @arg3 contains a argument.
+ * @arg4 contains a argument.
+ * @arg5 contains a argument.
+ * Return 0 if permission is granted.
+ * @task_kmod_set_label:
+ * Set the security attributes in current->security for the kernel module
+ * loader thread, so that it has the permissions needed to perform its
+ * function.
+ * @task_reparent_to_init:
+ * Set the security attributes in @p->security for a kernel thread that
+ * is being reparented to the init task.
+ * @p contains the task_struct for the kernel thread.
+ *
+ * @ptrace:
+ * Check permission before allowing the @parent process to trace the
+ * @child process.
+ * Security modules may also want to perform a process tracing check
+ * during an execve in the set_security or compute_creds hooks of
+ * binprm_security_ops if the process is being traced and its security
+ * attributes would be changed by the execve.
+ * @parent contains the task_struct structure for parent process.
+ * @child contains the task_struct structure for child process.
+ * Return 0 if permission is granted.
+ * @capget:
+ * Get the @effective, @inheritable, and @permitted capability sets for
+ * the @target process. The hook may also perform permission checking to
+ * determine if the current process is allowed to see the capability sets
+ * of the @target process.
+ * @target contains the task_struct structure for target process.
+ * @effective contains the effective capability set.
+ * @inheritable contains the inheritable capability set.
+ * @permitted contains the permitted capability set.
+ * Return 0 if the capability sets were successfully obtained.
+ * @capset_check:
+ * Check permission before setting the @effective, @inheritable, and
+ * @permitted capability sets for the @target process.
+ * Caveat: @target is also set to current if a set of processes is
+ * specified (i.e. all processes other than current and init or a
+ * particular process group). Hence, the capset_set hook may need to
+ * revalidate permission to the actual target process.
+ * @target contains the task_struct structure for target process.
+ * @effective contains the effective capability set.
+ * @inheritable contains the inheritable capability set.
+ * @permitted contains the permitted capability set.
+ * Return 0 if permission is granted.
+ * @capset_set:
+ * Set the @effective, @inheritable, and @permitted capability sets for
+ * the @target process. Since capset_check cannot always check permission
+ * to the real @target process, this hook may also perform permission
+ * checking to determine if the current process is allowed to set the
+ * capability sets of the @target process. However, this hook has no way
+ * of returning an error due to the structure of the sys_capset code.
+ * @target contains the task_struct structure for target process.
+ * @effective contains the effective capability set.
+ * @inheritable contains the inheritable capability set.
+ * @permitted contains the permitted capability set.
+ * @capable:
+ * Check whether the @tsk process has the @cap capability.
+ * @tsk contains the task_struct for the process.
+ * @cap contains the capability <include/linux/capability.h>.
+ * Return 0 if the capability is granted for @tsk.
+ * @sys_security:
+ * Security modules may use this hook to implement new system calls for
+ * security-aware applications. The interface is similar to socketcall,
+ * but with an @id parameter to help identify the security module whose
+ * call is being invoked. The module is responsible for interpreting the
+ * parameters, and must copy in the @args array from user space if it is
+ * used.
+ * The recommended convention for creating the hexadecimal @id value is
+ * echo "Name_of_module" | md5sum | cut -c -8; by using this convention,
+ * there is no need for a central registry.
+ * @id contains the security module identifier.
+ * @call contains the call value.
+ * @args contains the call arguments (user space pointer).
+ * The module should return -ENOSYS if it does not implement any new
+ * system calls.
+ *
+ * @register_security:
+ * allow module stacking.
+ * @name contains the name of the security module being stacked.
+ * @ops contains a pointer to the struct security_operations of the module to stack.
+ * @unregister_security:
+ * remove a stacked module.
+ * @name contains the name of the security module being unstacked.
+ * @ops contains a pointer to the struct security_operations of the module to unstack.
+ *
+ * This is the main security structure.
+ */
+struct security_operations {
+ int (*ptrace) (struct task_struct * parent, struct task_struct * child);
+ int (*capget) (struct task_struct * target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable, kernel_cap_t * permitted);
+ int (*capset_check) (struct task_struct * target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted);
+ void (*capset_set) (struct task_struct * target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted);
+ int (*capable) (struct task_struct * tsk, int cap);
+ int (*sys_security) (unsigned int id, unsigned call,
+ unsigned long *args);
+
+ int (*bprm_alloc_security) (struct linux_binprm * bprm);
+ void (*bprm_free_security) (struct linux_binprm * bprm);
+ void (*bprm_compute_creds) (struct linux_binprm * bprm);
+ int (*bprm_set_security) (struct linux_binprm * bprm);
+ int (*bprm_check_security) (struct linux_binprm * bprm);
+
+ int (*task_create) (unsigned long clone_flags);
+ int (*task_alloc_security) (struct task_struct * p);
+ void (*task_free_security) (struct task_struct * p);
+ int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags);
+ int (*task_post_setuid) (uid_t old_ruid /* or fsuid */ ,
+ uid_t old_euid, uid_t old_suid, int flags);
+ int (*task_setgid) (gid_t id0, gid_t id1, gid_t id2, int flags);
+ int (*task_setpgid) (struct task_struct * p, pid_t pgid);
+ int (*task_getpgid) (struct task_struct * p);
+ int (*task_getsid) (struct task_struct * p);
+ int (*task_setgroups) (int gidsetsize, gid_t * grouplist);
+ int (*task_setnice) (struct task_struct * p, int nice);
+ int (*task_setrlimit) (unsigned int resource, struct rlimit * new_rlim);
+ int (*task_setscheduler) (struct task_struct * p, int policy,
+ struct sched_param * lp);
+ int (*task_getscheduler) (struct task_struct * p);
+ int (*task_kill) (struct task_struct * p,
+ struct siginfo * info, int sig);
+ int (*task_wait) (struct task_struct * p);
+ int (*task_prctl) (int option, unsigned long arg2,
+ unsigned long arg3, unsigned long arg4,
+ unsigned long arg5);
+ void (*task_kmod_set_label) (void);
+ void (*task_reparent_to_init) (struct task_struct * p);
+
+ /* allow module stacking */
+ int (*register_security) (const char *name,
+ struct security_operations *ops);
+ int (*unregister_security) (const char *name,
+ struct security_operations *ops);
+};
+
+
+/* prototypes */
+extern int security_scaffolding_startup (void);
+extern int register_security (struct security_operations *ops);
+extern int unregister_security (struct security_operations *ops);
+extern int mod_reg_security (const char *name, struct security_operations *ops);
+extern int mod_unreg_security (const char *name, struct security_operations *ops);
+extern int capable (int cap);
+
+/* global variables */
+extern struct security_operations *security_ops;
+
+
+#endif /* __KERNEL__ */
+
+#endif /* ! __LINUX_SECURITY_H */
+
--- /dev/null
+CONFIG_SECURITY_CAPABILITIES
+ This enables the "default" Linux capabilities functionality.
+ If you are unsure how to answer this question, answer Y.
+
--- /dev/null
+#
+# Security configuration
+#
+mainmenu_option next_comment
+comment 'Security options'
+tristate 'Capabilities Support' CONFIG_SECURITY_CAPABILITIES
+endmenu
--- /dev/null
+#
+# Makefile for the kernel security code
+#
+
+# Objects that export symbols
+export-objs := security.o
+
+# Object file lists
+obj-y := security.o dummy.o
+
+obj-$(CONFIG_SECURITY_CAPABILITIES) += capability.o
+
+include $(TOPDIR)/Rules.make
--- /dev/null
+/*
+ * Capabilities Linux Security Module
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+
+/* flag to keep track of how we were registered */
+static int secondary;
+
+static int cap_capable (struct task_struct *tsk, int cap)
+{
+ /* Derived from include/linux/sched.h:capable. */
+ if (cap_raised (tsk->cap_effective, cap))
+ return 0;
+ else
+ return -EPERM;
+}
+
+static int cap_sys_security (unsigned int id, unsigned int call,
+ unsigned long *args)
+{
+ return -ENOSYS;
+}
+
+static int cap_ptrace (struct task_struct *parent, struct task_struct *child)
+{
+ /* Derived from arch/i386/kernel/ptrace.c:sys_ptrace. */
+ if (!cap_issubset (child->cap_permitted, current->cap_permitted) &&
+ !capable (CAP_SYS_PTRACE))
+ return -EPERM;
+ else
+ return 0;
+}
+
+static int cap_capget (struct task_struct *target, kernel_cap_t * effective,
+ kernel_cap_t * inheritable, kernel_cap_t * permitted)
+{
+ /* Derived from kernel/capability.c:sys_capget. */
+ *effective = cap_t (target->cap_effective);
+ *inheritable = cap_t (target->cap_inheritable);
+ *permitted = cap_t (target->cap_permitted);
+ return 0;
+}
+
+static int cap_capset_check (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ /* Derived from kernel/capability.c:sys_capset. */
+ /* verify restrictions on target's new Inheritable set */
+ if (!cap_issubset (*inheritable,
+ cap_combine (target->cap_inheritable,
+ current->cap_permitted))) {
+ return -EPERM;
+ }
+
+ /* verify restrictions on target's new Permitted set */
+ if (!cap_issubset (*permitted,
+ cap_combine (target->cap_permitted,
+ current->cap_permitted))) {
+ return -EPERM;
+ }
+
+ /* verify the _new_Effective_ is a subset of the _new_Permitted_ */
+ if (!cap_issubset (*effective, *permitted)) {
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+static void cap_capset_set (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ target->cap_effective = *effective;
+ target->cap_inheritable = *inheritable;
+ target->cap_permitted = *permitted;
+}
+
+static int cap_bprm_alloc_security (struct linux_binprm *bprm)
+{
+ return 0;
+}
+
+static int cap_bprm_set_security (struct linux_binprm *bprm)
+{
+ /* Copied from fs/exec.c:prepare_binprm. */
+
+ /* We don't have VFS support for capabilities yet */
+ cap_clear (bprm->cap_inheritable);
+ cap_clear (bprm->cap_permitted);
+ cap_clear (bprm->cap_effective);
+
+ /* To support inheritance of root-permissions and suid-root
+ * executables under compatibility mode, we raise all three
+ * capability sets for the file.
+ *
+ * If only the real uid is 0, we only raise the inheritable
+ * and permitted sets of the executable file.
+ */
+
+ if (!issecure (SECURE_NOROOT)) {
+ if (bprm->e_uid == 0 || current->uid == 0) {
+ cap_set_full (bprm->cap_inheritable);
+ cap_set_full (bprm->cap_permitted);
+ }
+ if (bprm->e_uid == 0)
+ cap_set_full (bprm->cap_effective);
+ }
+ return 0;
+}
+
+static int cap_bprm_check_security (struct linux_binprm *bprm)
+{
+ return 0;
+}
+
+static void cap_bprm_free_security (struct linux_binprm *bprm)
+{
+ return;
+}
+
+/* Copied from fs/exec.c */
+static inline int must_not_trace_exec (struct task_struct *p)
+{
+ return (p->ptrace & PT_PTRACED) && !(p->ptrace & PT_PTRACE_CAP);
+}
+
+static void cap_bprm_compute_creds (struct linux_binprm *bprm)
+{
+ /* Derived from fs/exec.c:compute_creds. */
+ kernel_cap_t new_permitted, working;
+ int do_unlock = 0;
+
+ new_permitted = cap_intersect (bprm->cap_permitted, cap_bset);
+ working = cap_intersect (bprm->cap_inheritable,
+ current->cap_inheritable);
+ new_permitted = cap_combine (new_permitted, working);
+
+ if (!cap_issubset (new_permitted, current->cap_permitted)) {
+ current->mm->dumpable = 0;
+
+ lock_kernel ();
+ if (must_not_trace_exec (current)
+ || atomic_read (¤t->fs->count) > 1
+ || atomic_read (¤t->files->count) > 1
+ || atomic_read (¤t->sig->count) > 1) {
+ if (!capable (CAP_SETPCAP)) {
+ new_permitted = cap_intersect (new_permitted,
+ current->
+ cap_permitted);
+ }
+ }
+ do_unlock = 1;
+ }
+
+ /* For init, we want to retain the capabilities set
+ * in the init_task struct. Thus we skip the usual
+ * capability rules */
+ if (current->pid != 1) {
+ current->cap_permitted = new_permitted;
+ current->cap_effective =
+ cap_intersect (new_permitted, bprm->cap_effective);
+ }
+
+ /* AUD: Audit candidate if current->cap_effective is set */
+
+ if (do_unlock)
+ unlock_kernel ();
+
+ current->keep_capabilities = 0;
+}
+
+static int cap_task_create (unsigned long clone_flags)
+{
+ return 0;
+}
+
+static int cap_task_alloc_security (struct task_struct *p)
+{
+ return 0;
+}
+
+static void cap_task_free_security (struct task_struct *p)
+{
+ return;
+}
+
+static int cap_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
+{
+ return 0;
+}
+
+/* moved from kernel/sys.c. */
+/*
+ * cap_emulate_setxuid() fixes the effective / permitted capabilities of
+ * a process after a call to setuid, setreuid, or setresuid.
+ *
+ * 1) When set*uiding _from_ one of {r,e,s}uid == 0 _to_ all of
+ * {r,e,s}uid != 0, the permitted and effective capabilities are
+ * cleared.
+ *
+ * 2) When set*uiding _from_ euid == 0 _to_ euid != 0, the effective
+ * capabilities of the process are cleared.
+ *
+ * 3) When set*uiding _from_ euid != 0 _to_ euid == 0, the effective
+ * capabilities are set to the permitted capabilities.
+ *
+ * fsuid is handled elsewhere. fsuid == 0 and {r,e,s}uid!= 0 should
+ * never happen.
+ *
+ * -astor
+ *
+ * cevans - New behaviour, Oct '99
+ * A process may, via prctl(), elect to keep its capabilities when it
+ * calls setuid() and switches away from uid==0. Both permitted and
+ * effective sets will be retained.
+ * Without this change, it was impossible for a daemon to drop only some
+ * of its privilege. The call to setuid(!=0) would drop all privileges!
+ * Keeping uid 0 is not an option because uid 0 owns too many vital
+ * files..
+ * Thanks to Olaf Kirch and Peter Benie for spotting this.
+ */
+static inline void cap_emulate_setxuid (int old_ruid, int old_euid,
+ int old_suid)
+{
+ if ((old_ruid == 0 || old_euid == 0 || old_suid == 0) &&
+ (current->uid != 0 && current->euid != 0 && current->suid != 0) &&
+ !current->keep_capabilities) {
+ cap_clear (current->cap_permitted);
+ cap_clear (current->cap_effective);
+ }
+ if (old_euid == 0 && current->euid != 0) {
+ cap_clear (current->cap_effective);
+ }
+ if (old_euid != 0 && current->euid == 0) {
+ current->cap_effective = current->cap_permitted;
+ }
+}
+
+static int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid,
+ int flags)
+{
+ switch (flags) {
+ case LSM_SETID_RE:
+ case LSM_SETID_ID:
+ case LSM_SETID_RES:
+ /* Copied from kernel/sys.c:setreuid/setuid/setresuid. */
+ if (!issecure (SECURE_NO_SETUID_FIXUP)) {
+ cap_emulate_setxuid (old_ruid, old_euid, old_suid);
+ }
+ break;
+ case LSM_SETID_FS:
+ {
+ uid_t old_fsuid = old_ruid;
+
+ /* Copied from kernel/sys.c:setfsuid. */
+
+ /*
+ * FIXME - is fsuser used for all CAP_FS_MASK capabilities?
+ * if not, we might be a bit too harsh here.
+ */
+
+ if (!issecure (SECURE_NO_SETUID_FIXUP)) {
+ if (old_fsuid == 0 && current->fsuid != 0) {
+ cap_t (current->cap_effective) &=
+ ~CAP_FS_MASK;
+ }
+ if (old_fsuid != 0 && current->fsuid == 0) {
+ cap_t (current->cap_effective) |=
+ (cap_t (current->cap_permitted) &
+ CAP_FS_MASK);
+ }
+ }
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int cap_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
+{
+ return 0;
+}
+
+static int cap_task_setpgid (struct task_struct *p, pid_t pgid)
+{
+ return 0;
+}
+
+static int cap_task_getpgid (struct task_struct *p)
+{
+ return 0;
+}
+
+static int cap_task_getsid (struct task_struct *p)
+{
+ return 0;
+}
+
+static int cap_task_setgroups (int gidsetsize, gid_t * grouplist)
+{
+ return 0;
+}
+
+static int cap_task_setnice (struct task_struct *p, int nice)
+{
+ return 0;
+}
+
+static int cap_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
+{
+ return 0;
+}
+
+static int cap_task_setscheduler (struct task_struct *p, int policy,
+ struct sched_param *lp)
+{
+ return 0;
+}
+
+static int cap_task_getscheduler (struct task_struct *p)
+{
+ return 0;
+}
+
+static int cap_task_wait (struct task_struct *p)
+{
+ return 0;
+}
+
+static int cap_task_kill (struct task_struct *p, struct siginfo *info, int sig)
+{
+ return 0;
+}
+
+static int cap_task_prctl (int option, unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ return 0;
+}
+
+static void cap_task_kmod_set_label (void)
+{
+ cap_set_full (current->cap_effective);
+ return;
+}
+
+static void cap_task_reparent_to_init (struct task_struct *p)
+{
+ p->cap_effective = CAP_INIT_EFF_SET;
+ p->cap_inheritable = CAP_INIT_INH_SET;
+ p->cap_permitted = CAP_FULL_SET;
+ p->keep_capabilities = 0;
+ return;
+}
+
+static int cap_register (const char *name, struct security_operations *ops)
+{
+ return -EINVAL;
+}
+
+static int cap_unregister (const char *name, struct security_operations *ops)
+{
+ return -EINVAL;
+}
+
+static struct security_operations capability_ops = {
+ ptrace: cap_ptrace,
+ capget: cap_capget,
+ capset_check: cap_capset_check,
+ capset_set: cap_capset_set,
+ capable: cap_capable,
+ sys_security: cap_sys_security,
+
+ bprm_alloc_security: cap_bprm_alloc_security,
+ bprm_free_security: cap_bprm_free_security,
+ bprm_compute_creds: cap_bprm_compute_creds,
+ bprm_set_security: cap_bprm_set_security,
+ bprm_check_security: cap_bprm_check_security,
+
+ task_create: cap_task_create,
+ task_alloc_security: cap_task_alloc_security,
+ task_free_security: cap_task_free_security,
+ task_setuid: cap_task_setuid,
+ task_post_setuid: cap_task_post_setuid,
+ task_setgid: cap_task_setgid,
+ task_setpgid: cap_task_setpgid,
+ task_getpgid: cap_task_getpgid,
+ task_getsid: cap_task_getsid,
+ task_setgroups: cap_task_setgroups,
+ task_setnice: cap_task_setnice,
+ task_setrlimit: cap_task_setrlimit,
+ task_setscheduler: cap_task_setscheduler,
+ task_getscheduler: cap_task_getscheduler,
+ task_wait: cap_task_wait,
+ task_kill: cap_task_kill,
+ task_prctl: cap_task_prctl,
+ task_kmod_set_label: cap_task_kmod_set_label,
+ task_reparent_to_init: cap_task_reparent_to_init,
+
+ register_security: cap_register,
+ unregister_security: cap_unregister,
+};
+
+#if defined(CONFIG_SECURITY_CAPABILITIES_MODULE)
+#define MY_NAME THIS_MODULE->name
+#else
+#define MY_NAME "capability"
+#endif
+
+static int __init capability_init (void)
+{
+ /* register ourselves with the security framework */
+ if (register_security (&capability_ops)) {
+ printk (KERN_INFO
+ "Failure registering capabilities with the kernel\n");
+ /* try registering with primary module */
+ if (mod_reg_security (MY_NAME, &capability_ops)) {
+ printk (KERN_INFO "Failure registering capabilities "
+ "with primary security module.\n");
+ return -EINVAL;
+ }
+ secondary = 1;
+ }
+ printk (KERN_INFO "Capability LSM initialized\n");
+ return 0;
+}
+
+static void __exit capability_exit (void)
+{
+ /* remove ourselves from the security framework */
+ if (secondary) {
+ if (mod_unreg_security (MY_NAME, &capability_ops))
+ printk (KERN_INFO "Failure unregistering capabilities "
+ "with primary module.\n");
+ return;
+ }
+
+ if (unregister_security (&capability_ops)) {
+ printk (KERN_INFO
+ "Failure unregistering capabilities with the kernel\n");
+ }
+}
+
+module_init (capability_init);
+module_exit (capability_exit);
+
+MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * Stub functions for the default security function pointers in case no
+ * security model is loaded.
+ *
+ * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
+ * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+
+static int dummy_ptrace (struct task_struct *parent, struct task_struct *child)
+{
+ return 0;
+}
+
+static int dummy_capget (struct task_struct *target, kernel_cap_t * effective,
+ kernel_cap_t * inheritable, kernel_cap_t * permitted)
+{
+ return 0;
+}
+
+static int dummy_capset_check (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ return 0;
+}
+
+static void dummy_capset_set (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ return;
+}
+
+static int dummy_capable (struct task_struct *tsk, int cap)
+{
+ if (cap_is_fs_cap (cap) ? tsk->fsuid == 0 : tsk->euid == 0)
+ /* capability granted */
+ return 0;
+
+ /* capability denied */
+ return -EPERM;
+}
+
+static int dummy_sys_security (unsigned int id, unsigned int call,
+ unsigned long *args)
+{
+ return -ENOSYS;
+}
+
+static int dummy_bprm_alloc_security (struct linux_binprm *bprm)
+{
+ return 0;
+}
+
+static void dummy_bprm_free_security (struct linux_binprm *bprm)
+{
+ return;
+}
+
+static void dummy_bprm_compute_creds (struct linux_binprm *bprm)
+{
+ return;
+}
+
+static int dummy_bprm_set_security (struct linux_binprm *bprm)
+{
+ return 0;
+}
+
+static int dummy_bprm_check_security (struct linux_binprm *bprm)
+{
+ return 0;
+}
+
+static int dummy_task_create (unsigned long clone_flags)
+{
+ return 0;
+}
+
+static int dummy_task_alloc_security (struct task_struct *p)
+{
+ return 0;
+}
+
+static void dummy_task_free_security (struct task_struct *p)
+{
+ return;
+}
+
+static int dummy_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
+{
+ return 0;
+}
+
+static int dummy_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
+{
+ return 0;
+}
+
+static int dummy_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
+{
+ return 0;
+}
+
+static int dummy_task_setpgid (struct task_struct *p, pid_t pgid)
+{
+ return 0;
+}
+
+static int dummy_task_getpgid (struct task_struct *p)
+{
+ return 0;
+}
+
+static int dummy_task_getsid (struct task_struct *p)
+{
+ return 0;
+}
+
+static int dummy_task_setgroups (int gidsetsize, gid_t * grouplist)
+{
+ return 0;
+}
+
+static int dummy_task_setnice (struct task_struct *p, int nice)
+{
+ return 0;
+}
+
+static int dummy_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
+{
+ return 0;
+}
+
+static int dummy_task_setscheduler (struct task_struct *p, int policy,
+ struct sched_param *lp)
+{
+ return 0;
+}
+
+static int dummy_task_getscheduler (struct task_struct *p)
+{
+ return 0;
+}
+
+static int dummy_task_wait (struct task_struct *p)
+{
+ return 0;
+}
+
+static int dummy_task_kill (struct task_struct *p, struct siginfo *info,
+ int sig)
+{
+ return 0;
+}
+
+static int dummy_task_prctl (int option, unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ return 0;
+}
+
+static void dummy_task_kmod_set_label (void)
+{
+ return;
+}
+
+static void dummy_task_reparent_to_init (struct task_struct *p)
+{
+ p->euid = p->fsuid = 0;
+ return;
+}
+
+static int dummy_register (const char *name, struct security_operations *ops)
+{
+ return -EINVAL;
+}
+
+static int dummy_unregister (const char *name, struct security_operations *ops)
+{
+ return -EINVAL;
+}
+
+struct security_operations dummy_security_ops = {
+ ptrace: dummy_ptrace,
+ capget: dummy_capget,
+ capset_check: dummy_capset_check,
+ capset_set: dummy_capset_set,
+ capable: dummy_capable,
+ sys_security: dummy_sys_security,
+
+ bprm_alloc_security: dummy_bprm_alloc_security,
+ bprm_free_security: dummy_bprm_free_security,
+ bprm_compute_creds: dummy_bprm_compute_creds,
+ bprm_set_security: dummy_bprm_set_security,
+ bprm_check_security: dummy_bprm_check_security,
+
+ task_create: dummy_task_create,
+ task_alloc_security: dummy_task_alloc_security,
+ task_free_security: dummy_task_free_security,
+ task_setuid: dummy_task_setuid,
+ task_post_setuid: dummy_task_post_setuid,
+ task_setgid: dummy_task_setgid,
+ task_setpgid: dummy_task_setpgid,
+ task_getpgid: dummy_task_getpgid,
+ task_getsid: dummy_task_getsid,
+ task_setgroups: dummy_task_setgroups,
+ task_setnice: dummy_task_setnice,
+ task_setrlimit: dummy_task_setrlimit,
+ task_setscheduler: dummy_task_setscheduler,
+ task_getscheduler: dummy_task_getscheduler,
+ task_wait: dummy_task_wait,
+ task_kill: dummy_task_kill,
+ task_prctl: dummy_task_prctl,
+ task_kmod_set_label: dummy_task_kmod_set_label,
+ task_reparent_to_init: dummy_task_reparent_to_init,
+
+ register_security: dummy_register,
+ unregister_security: dummy_unregister,
+};
+
--- /dev/null
+/*
+ * Security plug functions
+ *
+ * Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
+ * Copyright (C) 2001 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/security.h>
+
+#define SECURITY_SCAFFOLD_VERSION "1.0.0"
+
+extern struct security_operations dummy_security_ops; /* lives in dummy.c */
+
+struct security_operations *security_ops; /* Initialized to NULL */
+
+/* This macro checks that all pointers in a struct are non-NULL. It
+ * can be fooled by struct padding for object tile alignment and when
+ * pointers to data and pointers to functions aren't the same size.
+ * Yes it's ugly, we'll replace it if it becomes a problem.
+ */
+#define VERIFY_STRUCT(struct_type, s, e) \
+ do { \
+ unsigned long * __start = (unsigned long *)(s); \
+ unsigned long * __end = __start + \
+ sizeof(struct_type)/sizeof(unsigned long *); \
+ while (__start != __end) { \
+ if (!*__start) { \
+ printk(KERN_INFO "%s is missing something\n",\
+ #struct_type); \
+ e++; \
+ break; \
+ } \
+ __start++; \
+ } \
+ } while (0)
+
+static int inline verify (struct security_operations *ops)
+{
+ int err;
+
+ /* verify the security_operations structure exists */
+ if (!ops) {
+ printk (KERN_INFO "Passed a NULL security_operations "
+ "pointer, " __FUNCTION__ " failed.\n");
+ return -EINVAL;
+ }
+
+ /* Perform a little sanity checking on our inputs */
+ err = 0;
+
+ /* This first check scans the whole security_ops struct for
+ * missing structs or functions.
+ *
+ * (There is no further check now, but will leave as is until
+ * the lazy registration stuff is done -- JM).
+ */
+ VERIFY_STRUCT(struct security_operations, ops, err);
+
+ if (err) {
+ printk (KERN_INFO "Not enough functions specified in the "
+ "security_operation structure, " __FUNCTION__
+ " failed.\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * security_scaffolding_startup - initialzes the security scaffolding framework
+ *
+ * This should be called early in the kernel initialization sequence.
+ */
+int security_scaffolding_startup (void)
+{
+ printk (KERN_INFO "Security Scaffold v" SECURITY_SCAFFOLD_VERSION
+ " initialized\n");
+
+ security_ops = &dummy_security_ops;
+
+ return 0;
+}
+
+/**
+ * register_security - registers a security framework with the kernel
+ * @ops: a pointer to the struct security_options that is to be registered
+ *
+ * This function is to allow a security module to register itself with the
+ * kernel security subsystem. Some rudimentary checking is done on the @ops
+ * value passed to this function. A call to unregister_security() should be
+ * done to remove this security_options structure from the kernel.
+ *
+ * If the @ops structure does not contain function pointers for all hooks in
+ * the structure, or there is already a security module registered with the
+ * kernel, an error will be returned. Otherwise 0 is returned on success.
+ */
+int register_security (struct security_operations *ops)
+{
+
+ if (verify (ops)) {
+ printk (KERN_INFO __FUNCTION__ " could not verify "
+ "security_operations structure.\n");
+ return -EINVAL;
+ }
+ if (security_ops != &dummy_security_ops) {
+ printk (KERN_INFO "There is already a security "
+ "framework initialized, " __FUNCTION__ " failed.\n");
+ return -EINVAL;
+ }
+
+ security_ops = ops;
+
+ return 0;
+}
+
+/**
+ * unregister_security - unregisters a security framework with the kernel
+ * @ops: a pointer to the struct security_options that is to be registered
+ *
+ * This function removes a struct security_operations variable that had
+ * previously been registered with a successful call to register_security().
+ *
+ * If @ops does not match the valued previously passed to register_security()
+ * an error is returned. Otherwise the default security options is set to the
+ * the dummy_security_ops structure, and 0 is returned.
+ */
+int unregister_security (struct security_operations *ops)
+{
+ if (ops != security_ops) {
+ printk (KERN_INFO __FUNCTION__ ": trying to unregister "
+ "a security_opts structure that is not "
+ "registered, failing.\n");
+ return -EINVAL;
+ }
+
+ security_ops = &dummy_security_ops;
+
+ return 0;
+}
+
+/**
+ * mod_reg_security - allows security modules to be "stacked"
+ * @name: a pointer to a string with the name of the security_options to be registered
+ * @ops: a pointer to the struct security_options that is to be registered
+ *
+ * This function allows security modules to be stacked if the currently loaded
+ * security module allows this to happen. It passes the @name and @ops to the
+ * register_security function of the currently loaded security module.
+ *
+ * The return value depends on the currently loaded security module, with 0 as
+ * success.
+ */
+int mod_reg_security (const char *name, struct security_operations *ops)
+{
+ if (verify (ops)) {
+ printk (KERN_INFO __FUNCTION__ " could not verify "
+ "security operations.\n");
+ return -EINVAL;
+ }
+
+ if (ops == security_ops) {
+ printk (KERN_INFO __FUNCTION__ " security operations "
+ "already registered.\n");
+ return -EINVAL;
+ }
+
+ return security_ops->register_security (name, ops);
+}
+
+/**
+ * mod_unreg_security - allows a security module registered with mod_reg_security() to be unloaded
+ * @name: a pointer to a string with the name of the security_options to be removed
+ * @ops: a pointer to the struct security_options that is to be removed
+ *
+ * This function allows security modules that have been successfully registered
+ * with a call to mod_reg_security() to be unloaded from the system.
+ * This calls the currently loaded security module's unregister_security() call
+ * with the @name and @ops variables.
+ *
+ * The return value depends on the currently loaded security module, with 0 as
+ * success.
+ */
+int mod_unreg_security (const char *name, struct security_operations *ops)
+{
+ if (ops == security_ops) {
+ printk (KERN_INFO __FUNCTION__ " invalid attempt to unregister "
+ " primary security ops.\n");
+ return -EINVAL;
+ }
+
+ return security_ops->unregister_security (name, ops);
+}
+
+/**
+ * capable - calls the currently loaded security module's capable() function with the specified capability
+ * @cap: the requested capability level.
+ *
+ * This function calls the currently loaded security module's cabable()
+ * function with a pointer to the current task and the specified @cap value.
+ *
+ * This allows the security module to implement the capable function call
+ * however it chooses to.
+ */
+int capable (int cap)
+{
+ if (security_ops->capable (current, cap)) {
+ /* capability denied */
+ return 0;
+ }
+
+ /* capability granted */
+ current->flags |= PF_SUPERPRIV;
+ return 1;
+}
+
+/**
+ * sys_security - security syscall multiplexor.
+ * @id: module id
+ * @call: call identifier
+ * @args: arg list for call
+ *
+ * Similar to sys_socketcall. Can use id to help identify which module user
+ * app is talking to. The recommended convention for creating the
+ * hexadecimal id value is:
+ * 'echo "Name_of_module" | md5sum | cut -c -8'.
+ * By following this convention, there's no need for a central registry.
+ */
+asmlinkage long sys_security (unsigned int id, unsigned int call,
+ unsigned long *args)
+{
+ return security_ops->sys_security (id, call, args);
+}
+
+EXPORT_SYMBOL (register_security);
+EXPORT_SYMBOL (unregister_security);
+EXPORT_SYMBOL (mod_reg_security);
+EXPORT_SYMBOL (mod_unreg_security);
+EXPORT_SYMBOL (capable);
+EXPORT_SYMBOL (security_ops);
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