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-rw-r--r--security/apparmor/capability.c141
-rw-r--r--security/apparmor/include/capability.h45
-rw-r--r--security/apparmor/include/ipc.h28
-rw-r--r--security/apparmor/include/resource.h46
-rw-r--r--security/apparmor/ipc.c114
-rw-r--r--security/apparmor/resource.c134
6 files changed, 508 insertions, 0 deletions
diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
new file mode 100644
index 00000000000..9982c48def4
--- /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 00000000000..c24d2959ea0
--- /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 00000000000..aeda0fbc8b2
--- /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 00000000000..3c88be94649
--- /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 00000000000..9013a78a166
--- /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 00000000000..4a368f1fd36
--- /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);
+ }
+}