Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 257 insertions, 0 deletions

diff --git a/security/apparmor/net.c b/security/apparmor/net.c
new file mode 100644
index 000000000..7efe4d172
--- /dev/null
+++ b/security/apparmor/net.c
@@ -0,0 +1,257 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor network mediation
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2017 Canonical Ltd.
+ */
+
+#include "include/apparmor.h"
+#include "include/audit.h"
+#include "include/cred.h"
+#include "include/label.h"
+#include "include/net.h"
+#include "include/policy.h"
+#include "include/secid.h"
+
+#include "net_names.h"
+
+
+struct aa_sfs_entry aa_sfs_entry_network[] = {
+	AA_SFS_FILE_STRING("af_mask",	AA_SFS_AF_MASK),
+	{ }
+};
+
+static const char * const net_mask_names[] = {
+	"unknown",
+	"send",
+	"receive",
+	"unknown",
+
+	"create",
+	"shutdown",
+	"connect",
+	"unknown",
+
+	"setattr",
+	"getattr",
+	"setcred",
+	"getcred",
+
+	"chmod",
+	"chown",
+	"chgrp",
+	"lock",
+
+	"mmap",
+	"mprot",
+	"unknown",
+	"unknown",
+
+	"accept",
+	"bind",
+	"listen",
+	"unknown",
+
+	"setopt",
+	"getopt",
+	"unknown",
+	"unknown",
+
+	"unknown",
+	"unknown",
+	"unknown",
+	"unknown",
+};
+
+
+/* audit callback for net specific fields */
+void audit_net_cb(struct audit_buffer *ab, void *va)
+{
+	struct common_audit_data *sa = va;
+
+	if (address_family_names[sa->u.net->family])
+		audit_log_format(ab, " family=\"%s\"",
+				 address_family_names[sa->u.net->family]);
+	else
+		audit_log_format(ab, " family=\"unknown(%d)\"",
+				 sa->u.net->family);
+	if (sock_type_names[aad(sa)->net.type])
+		audit_log_format(ab, " sock_type=\"%s\"",
+				 sock_type_names[aad(sa)->net.type]);
+	else
+		audit_log_format(ab, " sock_type=\"unknown(%d)\"",
+				 aad(sa)->net.type);
+	audit_log_format(ab, " protocol=%d", aad(sa)->net.protocol);
+
+	if (aad(sa)->request & NET_PERMS_MASK) {
+		audit_log_format(ab, " requested_mask=");
+		aa_audit_perm_mask(ab, aad(sa)->request, NULL, 0,
+				   net_mask_names, NET_PERMS_MASK);
+
+		if (aad(sa)->denied & NET_PERMS_MASK) {
+			audit_log_format(ab, " denied_mask=");
+			aa_audit_perm_mask(ab, aad(sa)->denied, NULL, 0,
+					   net_mask_names, NET_PERMS_MASK);
+		}
+	}
+	if (aad(sa)->peer) {
+		audit_log_format(ab, " peer=");
+		aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
+				FLAGS_NONE, GFP_ATOMIC);
+	}
+}
+
+/* Generic af perm */
+int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
+		       u32 request, u16 family, int type)
+{
+	struct aa_perms perms = { };
+	unsigned int state;
+	__be16 buffer[2];
+
+	AA_BUG(family >= AF_MAX);
+	AA_BUG(type < 0 || type >= SOCK_MAX);
+
+	if (profile_unconfined(profile))
+		return 0;
+	state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
+	if (!state)
+		return 0;
+
+	buffer[0] = cpu_to_be16(family);
+	buffer[1] = cpu_to_be16((u16) type);
+	state = aa_dfa_match_len(profile->policy.dfa, state, (char *) &buffer,
+				 4);
+	aa_compute_perms(profile->policy.dfa, state, &perms);
+	aa_apply_modes_to_perms(profile, &perms);
+
+	return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
+}
+
+int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
+	       int type, int protocol)
+{
+	struct aa_profile *profile;
+	DEFINE_AUDIT_NET(sa, op, NULL, family, type, protocol);
+
+	return fn_for_each_confined(label, profile,
+			aa_profile_af_perm(profile, &sa, request, family,
+					   type));
+}
+
+static int aa_label_sk_perm(struct aa_label *label, const char *op, u32 request,
+			    struct sock *sk)
+{
+	struct aa_sk_ctx *ctx = SK_CTX(sk);
+	int error = 0;
+
+	AA_BUG(!label);
+	AA_BUG(!sk);
+
+	if (ctx->label != kernel_t && !unconfined(label)) {
+		struct aa_profile *profile;
+		DEFINE_AUDIT_SK(sa, op, sk);
+
+		error = fn_for_each_confined(label, profile,
+			    aa_profile_af_sk_perm(profile, &sa, request, sk));
+	}
+
+	return error;
+}
+
+int aa_sk_perm(const char *op, u32 request, struct sock *sk)
+{
+	struct aa_label *label;
+	int error;
+
+	AA_BUG(!sk);
+	AA_BUG(in_interrupt());
+
+	/* TODO: switch to begin_current_label ???? */
+	label = begin_current_label_crit_section();
+	error = aa_label_sk_perm(label, op, request, sk);
+	end_current_label_crit_section(label);
+
+	return error;
+}
+
+
+int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
+		      struct socket *sock)
+{
+	AA_BUG(!label);
+	AA_BUG(!sock);
+	AA_BUG(!sock->sk);
+
+	return aa_label_sk_perm(label, op, request, sock->sk);
+}
+
+#ifdef CONFIG_NETWORK_SECMARK
+static int apparmor_secmark_init(struct aa_secmark *secmark)
+{
+	struct aa_label *label;
+
+	if (secmark->label[0] == '*') {
+		secmark->secid = AA_SECID_WILDCARD;
+		return 0;
+	}
+
+	label = aa_label_strn_parse(&root_ns->unconfined->label,
+				    secmark->label, strlen(secmark->label),
+				    GFP_ATOMIC, false, false);
+
+	if (IS_ERR(label))
+		return PTR_ERR(label);
+
+	secmark->secid = label->secid;
+
+	return 0;
+}
+
+static int aa_secmark_perm(struct aa_profile *profile, u32 request, u32 secid,
+			   struct common_audit_data *sa)
+{
+	int i, ret;
+	struct aa_perms perms = { };
+
+	if (profile->secmark_count == 0)
+		return 0;
+
+	for (i = 0; i < profile->secmark_count; i++) {
+		if (!profile->secmark[i].secid) {
+			ret = apparmor_secmark_init(&profile->secmark[i]);
+			if (ret)
+				return ret;
+		}
+
+		if (profile->secmark[i].secid == secid ||
+		    profile->secmark[i].secid == AA_SECID_WILDCARD) {
+			if (profile->secmark[i].deny)
+				perms.deny = ALL_PERMS_MASK;
+			else
+				perms.allow = ALL_PERMS_MASK;
+
+			if (profile->secmark[i].audit)
+				perms.audit = ALL_PERMS_MASK;
+		}
+	}
+
+	aa_apply_modes_to_perms(profile, &perms);
+
+	return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
+}
+
+int apparmor_secmark_check(struct aa_label *label, char *op, u32 request,
+			   u32 secid, const struct sock *sk)
+{
+	struct aa_profile *profile;
+	DEFINE_AUDIT_SK(sa, op, sk);
+
+	return fn_for_each_confined(label, profile,
+				    aa_secmark_perm(profile, request, secid,
+						    &sa));
+}
+#endif