166 lines
4.6 KiB
C
166 lines
4.6 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor /proc/<pid>/attr/ interface functions
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include "include/apparmor.h"
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#include "include/context.h"
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#include "include/policy.h"
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#include "include/domain.h"
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#include "include/procattr.h"
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/**
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* aa_getprocattr - Return the profile information for @profile
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* @profile: the profile to print profile info about (NOT NULL)
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* @string: Returns - string containing the profile info (NOT NULL)
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*
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* Returns: length of @string on success else error on failure
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*
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* Requires: profile != NULL
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*
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* Creates a string containing the namespace_name://profile_name for
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* @profile.
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*
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* Returns: size of string placed in @string else error code on failure
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*/
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int aa_getprocattr(struct aa_profile *profile, char **string)
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{
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char *str;
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int len = 0, mode_len = 0, ns_len = 0, name_len;
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const char *mode_str = aa_profile_mode_names[profile->mode];
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const char *ns_name = NULL;
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struct aa_namespace *ns = profile->ns;
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struct aa_namespace *current_ns = __aa_current_profile()->ns;
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char *s;
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if (!aa_ns_visible(current_ns, ns))
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return -EACCES;
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ns_name = aa_ns_name(current_ns, ns);
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ns_len = strlen(ns_name);
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/* if the visible ns_name is > 0 increase size for : :// seperator */
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if (ns_len)
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ns_len += 4;
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/* unconfined profiles don't have a mode string appended */
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if (!unconfined(profile))
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mode_len = strlen(mode_str) + 3; /* + 3 for _() */
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name_len = strlen(profile->base.hname);
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len = mode_len + ns_len + name_len + 1; /* + 1 for \n */
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s = str = kmalloc(len + 1, GFP_KERNEL); /* + 1 \0 */
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if (!str)
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return -ENOMEM;
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if (ns_len) {
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/* skip over prefix current_ns->base.hname and separating // */
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sprintf(s, ":%s://", ns_name);
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s += ns_len;
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}
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if (unconfined(profile))
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/* mode string not being appended */
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sprintf(s, "%s\n", profile->base.hname);
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else
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sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);
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*string = str;
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/* NOTE: len does not include \0 of string, not saved as part of file */
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return len;
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}
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/**
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* split_token_from_name - separate a string of form <token>^<name>
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* @op: operation being checked
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* @args: string to parse (NOT NULL)
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* @token: stores returned parsed token value (NOT NULL)
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*
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* Returns: start position of name after token else NULL on failure
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*/
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static char *split_token_from_name(int op, char *args, u64 * token)
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{
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char *name;
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*token = simple_strtoull(args, &name, 16);
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if ((name == args) || *name != '^') {
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AA_ERROR("%s: Invalid input '%s'", op_table[op], args);
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return ERR_PTR(-EINVAL);
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}
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name++; /* skip ^ */
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if (!*name)
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name = NULL;
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return name;
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}
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/**
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* aa_setprocattr_chagnehat - handle procattr interface to change_hat
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* @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
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* @size: size of the args
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* @test: true if this is a test of change_hat permissions
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*
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* Returns: %0 or error code if change_hat fails
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*/
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int aa_setprocattr_changehat(char *args, size_t size, int test)
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{
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char *hat;
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u64 token;
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const char *hats[16]; /* current hard limit on # of names */
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int count = 0;
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hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
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if (IS_ERR(hat))
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return PTR_ERR(hat);
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if (!hat && !token) {
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AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
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return -EINVAL;
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}
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if (hat) {
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/* set up hat name vector, args guaranteed null terminated
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* at args[size] by setprocattr.
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*
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* If there are multiple hat names in the buffer each is
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* separated by a \0. Ie. userspace writes them pre tokenized
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*/
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char *end = args + size;
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for (count = 0; (hat < end) && count < 16; ++count) {
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char *next = hat + strlen(hat) + 1;
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hats[count] = hat;
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hat = next;
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}
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}
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AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",
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__func__, token, hat ? hat : NULL);
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return aa_change_hat(hats, count, token, test);
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}
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/**
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* aa_setprocattr_changeprofile - handle procattr interface to changeprofile
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* @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
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* @onexec: true if change_profile should be delayed until exec
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* @test: true if this is a test of change_profile permissions
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*
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* Returns: %0 or error code if change_profile fails
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*/
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int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
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{
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char *name, *ns_name;
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name = aa_split_fqname(fqname, &ns_name);
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return aa_change_profile(ns_name, name, onexec, test);
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}
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