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/*
* AppArmor security module
*
* This file contains AppArmor /proc/<pid>/attr/ interface 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 "include/apparmor.h"
#include "include/context.h"
#include "include/policy.h"
#include "include/policy_ns.h"
#include "include/domain.h"
#include "include/procattr.h"
/**
* aa_getprocattr - Return the profile information for @profile
* @profile: the profile to print profile info about (NOT NULL)
* @string: Returns - string containing the profile info (NOT NULL)
*
* Returns: length of @string on success else error on failure
*
* Requires: profile != NULL
*
* Creates a string containing the namespace_name://profile_name for
* @profile.
*
* Returns: size of string placed in @string else error code on failure
*/
int aa_getprocattr(struct aa_profile *profile, char **string)
{
char *str;
int len = 0, mode_len = 0, ns_len = 0, name_len;
const char *mode_str = aa_profile_mode_names[profile->mode];
const char *ns_name = NULL;
struct aa_ns *ns = profile->ns;
struct aa_ns *current_ns = __aa_current_profile()->ns;
char *s;
if (!aa_ns_visible(current_ns, ns, true))
return -EACCES;
ns_name = aa_ns_name(current_ns, ns, true);
ns_len = strlen(ns_name);
/* if the visible ns_name is > 0 increase size for : :// seperator */
if (ns_len)
ns_len += 4;
/* unconfined profiles don't have a mode string appended */
if (!unconfined(profile))
mode_len = strlen(mode_str) + 3; /* + 3 for _() */
name_len = strlen(profile->base.hname);
len = mode_len + ns_len + name_len + 1; /* + 1 for \n */
s = str = kmalloc(len + 1, GFP_KERNEL); /* + 1 \0 */
if (!str)
return -ENOMEM;
if (ns_len) {
/* skip over prefix current_ns->base.hname and separating // */
sprintf(s, ":%s://", ns_name);
s += ns_len;
}
if (unconfined(profile))
/* mode string not being appended */
sprintf(s, "%s\n", profile->base.hname);
else
sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);
*string = str;
/* NOTE: len does not include \0 of string, not saved as part of file */
return len;
}
/**
* split_token_from_name - separate a string of form <token>^<name>
* @op: operation being checked
* @args: string to parse (NOT NULL)
* @token: stores returned parsed token value (NOT NULL)
*
* Returns: start position of name after token else NULL on failure
*/
static char *split_token_from_name(const char *op, char *args, u64 *token)
{
char *name;
*token = simple_strtoull(args, &name, 16);
if ((name == args) || *name != '^') {
AA_ERROR("%s: Invalid input '%s'", op, args);
return ERR_PTR(-EINVAL);
}
name++; /* skip ^ */
if (!*name)
name = NULL;
return name;
}
/**
* aa_setprocattr_chagnehat - handle procattr interface to change_hat
* @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
* @size: size of the args
* @test: true if this is a test of change_hat permissions
*
* Returns: %0 or error code if change_hat fails
*/
int aa_setprocattr_changehat(char *args, size_t size, int test)
{
char *hat;
u64 token;
const char *hats[16]; /* current hard limit on # of names */
int count = 0;
hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
if (IS_ERR(hat))
return PTR_ERR(hat);
if (!hat && !token) {
AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
return -EINVAL;
}
if (hat) {
/* set up hat name vector, args guaranteed null terminated
* at args[size] by setprocattr.
*
* If there are multiple hat names in the buffer each is
* separated by a \0. Ie. userspace writes them pre tokenized
*/
char *end = args + size;
for (count = 0; (hat < end) && count < 16; ++count) {
char *next = hat + strlen(hat) + 1;
hats[count] = hat;
AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
, __func__, current->pid, token, count, hat);
hat = next;
}
} else
AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
__func__, current->pid, token, count, "<NULL>");
return aa_change_hat(hats, count, token, test);
}
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