6 files changed, 508 insertions, 0 deletions

diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
new file mode 100644
index 0000000..9982c48
--- /dev/null
+++ b/security/apparmor/capability.c
@@ -0,0 +1,141 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor capability mediation functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+
+#include "include/apparmor.h"
+#include "include/capability.h"
+#include "include/context.h"
+#include "include/policy.h"
+#include "include/audit.h"
+
+/*
+ * Table of capability names: we generate it from capabilities.h.
+ */
+#include "capability_names.h"
+
+struct audit_cache {
+	struct aa_profile *profile;
+	kernel_cap_t caps;
+};
+
+static DEFINE_PER_CPU(struct audit_cache, audit_cache);
+
+/**
+ * audit_cb - call back for capability components of audit struct
+ * @ab - audit buffer   (NOT NULL)
+ * @va - audit struct to audit data from  (NOT NULL)
+ */
+static void audit_cb(struct audit_buffer *ab, void *va)
+{
+	struct common_audit_data *sa = va;
+	audit_log_format(ab, " capname=");
+	audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
+}
+
+/**
+ * audit_caps - audit a capability
+ * @profile: profile confining task (NOT NULL)
+ * @task: task capability test was performed against (NOT NULL)
+ * @cap: capability tested
+ * @error: error code returned by test
+ *
+ * Do auditing of capability and handle, audit/complain/kill modes switching
+ * and duplicate message elimination.
+ *
+ * Returns: 0 or sa->error on success,  error code on failure
+ */
+static int audit_caps(struct aa_profile *profile, struct task_struct *task,
+		      int cap, int error)
+{
+	struct audit_cache *ent;
+	int type = AUDIT_APPARMOR_AUTO;
+	struct common_audit_data sa;
+	COMMON_AUDIT_DATA_INIT(&sa, CAP);
+	sa.tsk = task;
+	sa.u.cap = cap;
+	sa.aad.op = OP_CAPABLE;
+	sa.aad.error = error;
+
+	if (likely(!error)) {
+		/* test if auditing is being forced */
+		if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&
+			   !cap_raised(profile->caps.audit, cap)))
+			return 0;
+		type = AUDIT_APPARMOR_AUDIT;
+	} else if (KILL_MODE(profile) ||
+		   cap_raised(profile->caps.kill, cap)) {
+		type = AUDIT_APPARMOR_KILL;
+	} else if (cap_raised(profile->caps.quiet, cap) &&
+		   AUDIT_MODE(profile) != AUDIT_NOQUIET &&
+		   AUDIT_MODE(profile) != AUDIT_ALL) {
+		/* quiet auditing */
+		return error;
+	}
+
+	/* Do simple duplicate message elimination */
+	ent = &get_cpu_var(audit_cache);
+	if (profile == ent->profile && cap_raised(ent->caps, cap)) {
+		put_cpu_var(audit_cache);
+		if (COMPLAIN_MODE(profile))
+			return complain_error(error);
+		return error;
+	} else {
+		aa_put_profile(ent->profile);
+		ent->profile = aa_get_profile(profile);
+		cap_raise(ent->caps, cap);
+	}
+	put_cpu_var(audit_cache);
+
+	return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);
+}
+
+/**
+ * profile_capable - test if profile allows use of capability @cap
+ * @profile: profile being enforced    (NOT NULL, NOT unconfined)
+ * @cap: capability to test if allowed
+ *
+ * Returns: 0 if allowed else -EPERM
+ */
+static int profile_capable(struct aa_profile *profile, int cap)
+{
+	return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;
+}
+
+/**
+ * aa_capable - test permission to use capability
+ * @task: task doing capability test against (NOT NULL)
+ * @profile: profile confining @task (NOT NULL)
+ * @cap: capability to be tested
+ * @audit: whether an audit record should be generated
+ *
+ * Look up capability in profile capability set.
+ *
+ * Returns: 0 on success, or else an error code.
+ */
+int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
+	       int audit)
+{
+	int error = profile_capable(profile, cap);
+
+	if (!audit) {
+		if (COMPLAIN_MODE(profile))
+			return complain_error(error);
+		return error;
+	}
+
+	return audit_caps(profile, task, cap, error);
+}
diff --git a/security/apparmor/include/capability.h b/security/apparmor/include/capability.h
new file mode 100644
index 0000000..c24d295
--- /dev/null
+++ b/security/apparmor/include/capability.h
@@ -0,0 +1,45 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor capability mediation definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_CAPABILITY_H
+#define __AA_CAPABILITY_H
+
+#include <linux/sched.h>
+
+struct aa_profile;
+
+/* aa_caps - confinement data for capabilities
+ * @allowed: capabilities mask
+ * @audit: caps that are to be audited
+ * @quiet: caps that should not be audited
+ * @kill: caps that when requested will result in the task being killed
+ * @extended: caps that are subject finer grained mediation
+ */
+struct aa_caps {
+	kernel_cap_t allow;
+	kernel_cap_t audit;
+	kernel_cap_t quiet;
+	kernel_cap_t kill;
+	kernel_cap_t extended;
+};
+
+int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
+	       int audit);
+
+static inline void aa_free_cap_rules(struct aa_caps *caps)
+{
+	/* NOP */
+}
+
+#endif /* __AA_CAPBILITY_H */
diff --git a/security/apparmor/include/ipc.h b/security/apparmor/include/ipc.h
new file mode 100644
index 0000000..aeda0fbc
--- /dev/null
+++ b/security/apparmor/include/ipc.h
@@ -0,0 +1,28 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor ipc mediation function definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_IPC_H
+#define __AA_IPC_H
+
+#include <linux/sched.h>
+
+struct aa_profile;
+
+int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer,
+		  struct aa_profile *tracee, unsigned int mode);
+
+int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,
+	      unsigned int mode);
+
+#endif /* __AA_IPC_H */
diff --git a/security/apparmor/include/resource.h b/security/apparmor/include/resource.h
new file mode 100644
index 0000000..3c88be9
--- /dev/null
+++ b/security/apparmor/include/resource.h
@@ -0,0 +1,46 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor resource limits function definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_RESOURCE_H
+#define __AA_RESOURCE_H
+
+#include <linux/resource.h>
+#include <linux/sched.h>
+
+struct aa_profile;
+
+/* struct aa_rlimit - rlimit settings for the profile
+ * @mask: which hard limits to set
+ * @limits: rlimit values that override task limits
+ *
+ * AppArmor rlimits are used to set confined task rlimits.  Only the
+ * limits specified in @mask will be controlled by apparmor.
+ */
+struct aa_rlimit {
+	unsigned int mask;
+	struct rlimit limits[RLIM_NLIMITS];
+};
+
+int aa_map_resource(int resource);
+int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
+		      struct rlimit *new_rlim);
+
+void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new);
+
+static inline void aa_free_rlimit_rules(struct aa_rlimit *rlims)
+{
+	/* NOP */
+}
+
+#endif /* __AA_RESOURCE_H */
diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
new file mode 100644
index 0000000..9013a78
--- /dev/null
+++ b/security/apparmor/ipc.c
@@ -0,0 +1,114 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor ipc mediation
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#include <linux/gfp.h>
+#include <linux/ptrace.h>
+
+#include "include/audit.h"
+#include "include/capability.h"
+#include "include/context.h"
+#include "include/policy.h"
+
+/* call back to audit ptrace fields */
+static void audit_cb(struct audit_buffer *ab, void *va)
+{
+	struct common_audit_data *sa = va;
+	audit_log_format(ab, " target=");
+	audit_log_untrustedstring(ab, sa->aad.target);
+}
+
+/**
+ * aa_audit_ptrace - do auditing for ptrace
+ * @profile: profile being enforced  (NOT NULL)
+ * @target: profile being traced (NOT NULL)
+ * @error: error condition
+ *
+ * Returns: %0 or error code
+ */
+static int aa_audit_ptrace(struct aa_profile *profile,
+			   struct aa_profile *target, int error)
+{
+	struct common_audit_data sa;
+	COMMON_AUDIT_DATA_INIT(&sa, NONE);
+	sa.aad.op = OP_PTRACE;
+	sa.aad.target = target;
+	sa.aad.error = error;
+
+	return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_ATOMIC, &sa,
+			audit_cb);
+}
+
+/**
+ * aa_may_ptrace - test if tracer task can trace the tracee
+ * @tracer_task: task who will do the tracing  (NOT NULL)
+ * @tracer: profile of the task doing the tracing  (NOT NULL)
+ * @tracee: task to be traced
+ * @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH
+ *
+ * Returns: %0 else error code if permission denied or error
+ */
+int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer,
+		  struct aa_profile *tracee, unsigned int mode)
+{
+	/* TODO: currently only based on capability, not extended ptrace
+	 *       rules,
+	 *       Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH
+	 */
+
+	if (unconfined(tracer) || tracer == tracee)
+		return 0;
+	/* log this capability request */
+	return aa_capable(tracer_task, tracer, CAP_SYS_PTRACE, 1);
+}
+
+/**
+ * aa_ptrace - do ptrace permission check and auditing
+ * @tracer: task doing the tracing (NOT NULL)
+ * @tracee: task being traced (NOT NULL)
+ * @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH
+ *
+ * Returns: %0 else error code if permission denied or error
+ */
+int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,
+	      unsigned int mode)
+{
+	/*
+	 * tracer can ptrace tracee when
+	 * - tracer is unconfined ||
+	 *   - tracer is in complain mode
+	 *   - tracer has rules allowing it to trace tracee currently this is:
+	 *       - confined by the same profile ||
+	 *       - tracer profile has CAP_SYS_PTRACE
+	 */
+
+	struct aa_profile *tracer_p;
+	/* cred released below */
+	const struct cred *cred = get_task_cred(tracer);
+	int error = 0;
+	tracer_p = aa_cred_profile(cred);
+
+	if (!unconfined(tracer_p)) {
+		/* lcred released below */
+		struct cred *lcred = get_task_cred(tracee);
+		struct aa_profile *tracee_p = aa_cred_profile(lcred);
+
+		error = aa_may_ptrace(tracer, tracer_p, tracee_p, mode);
+		error = aa_audit_ptrace(tracer_p, tracee_p, error);
+
+		put_cred(lcred);
+	}
+	put_cred(cred);
+
+	return error;
+}
diff --git a/security/apparmor/resource.c b/security/apparmor/resource.c
new file mode 100644
index 0000000..4a368f1
--- /dev/null
+++ b/security/apparmor/resource.c
@@ -0,0 +1,134 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor resource mediation and attachment
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * 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, version 2 of the
+ * License.
+ */
+
+#include <linux/audit.h>
+
+#include "include/audit.h"
+#include "include/resource.h"
+#include "include/policy.h"
+
+/*
+ * Table of rlimit names: we generate it from resource.h.
+ */
+#include "rlim_names.h"
+
+/* audit callback for resource specific fields */
+static void audit_cb(struct audit_buffer *ab, void *va)
+{
+	struct common_audit_data *sa = va;
+
+	audit_log_format(ab, " rlimit=%s value=%lu",
+			 rlim_names[sa->aad.rlim.rlim], sa->aad.rlim.max);
+}
+
+/**
+ * audit_resource - audit setting resource limit
+ * @profile: profile being enforced  (NOT NULL)
+ * @resoure: rlimit being auditing
+ * @value: value being set
+ * @error: error value
+ *
+ * Returns: 0 or sa->error else other error code on failure
+ */
+static int audit_resource(struct aa_profile *profile, unsigned int resource,
+			  unsigned long value, int error)
+{
+	struct common_audit_data sa;
+
+	COMMON_AUDIT_DATA_INIT(&sa, NONE);
+	sa.aad.op = OP_SETRLIMIT,
+	sa.aad.rlim.rlim = resource;
+	sa.aad.rlim.max = value;
+	sa.aad.error = error;
+	return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_KERNEL, &sa,
+			audit_cb);
+}
+
+/**
+ * aa_map_resouce - map compiled policy resource to internal #
+ * @resource: flattened policy resource number
+ *
+ * Returns: resource # for the current architecture.
+ *
+ * rlimit resource can vary based on architecture, map the compiled policy
+ * resource # to the internal representation for the architecture.
+ */
+int aa_map_resource(int resource)
+{
+	return rlim_map[resource];
+}
+
+/**
+ * aa_task_setrlimit - test permission to set an rlimit
+ * @profile - profile confining the task  (NOT NULL)
+ * @resource - the resource being set
+ * @new_rlim - the new resource limit  (NOT NULL)
+ *
+ * Control raising the processes hard limit.
+ *
+ * Returns: 0 or error code if setting resource failed
+ */
+int aa_task_setrlimit(struct aa_profile *profile, unsigned int resource,
+		      struct rlimit *new_rlim)
+{
+	int error = 0;
+
+	if (profile->rlimits.mask & (1 << resource) &&
+	    new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max)
+
+		error = audit_resource(profile, resource, new_rlim->rlim_max,
+			-EACCES);
+
+	return error;
+}
+
+/**
+ * __aa_transition_rlimits - apply new profile rlimits
+ * @old: old profile on task  (NOT NULL)
+ * @new: new profile with rlimits to apply  (NOT NULL)
+ */
+void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new)
+{
+	unsigned int mask = 0;
+	struct rlimit *rlim, *initrlim;
+	int i;
+
+	/* for any rlimits the profile controlled reset the soft limit
+	 * to the less of the tasks hard limit and the init tasks soft limit
+	 */
+	if (old->rlimits.mask) {
+		for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
+			if (old->rlimits.mask & mask) {
+				rlim = current->signal->rlim + i;
+				initrlim = init_task.signal->rlim + i;
+				rlim->rlim_cur = min(rlim->rlim_max,
+						     initrlim->rlim_cur);
+			}
+		}
+	}
+
+	/* set any new hard limits as dictated by the new profile */
+	if (!new->rlimits.mask)
+		return;
+	for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
+		if (!(new->rlimits.mask & mask))
+			continue;
+
+		rlim = current->signal->rlim + i;
+		rlim->rlim_max = min(rlim->rlim_max,
+				     new->rlimits.limits[i].rlim_max);
+		/* soft limit should not exceed hard limit */
+		rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
+	}
+}