d8889d49e4
Now that file contexts have been moved into file, and task context fns() and data have been split from the context, only the cred context remains in context.h so rename to cred.h to better reflect what it deals with. Signed-off-by: John Johansen <john.johansen@canonical.com>
143 lines
3.7 KiB
C
143 lines
3.7 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/cred.h"
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#include "include/policy.h"
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#include "include/policy_ns.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_label *label, char **string)
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{
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struct aa_ns *ns = labels_ns(label);
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struct aa_ns *current_ns = aa_get_current_ns();
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int len;
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if (!aa_ns_visible(current_ns, ns, true)) {
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aa_put_ns(current_ns);
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return -EACCES;
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}
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len = aa_label_snxprint(NULL, 0, current_ns, label,
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
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FLAG_HIDDEN_UNCONFINED);
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AA_BUG(len < 0);
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*string = kmalloc(len + 2, GFP_KERNEL);
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if (!*string) {
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aa_put_ns(current_ns);
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return -ENOMEM;
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}
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len = aa_label_snxprint(*string, len + 2, current_ns, label,
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FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
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FLAG_HIDDEN_UNCONFINED);
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if (len < 0) {
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aa_put_ns(current_ns);
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return len;
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}
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(*string)[len] = '\n';
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(*string)[len + 1] = 0;
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aa_put_ns(current_ns);
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return len + 1;
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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(const char *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, 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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* @flags: set of flags governing behavior
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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 flags)
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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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AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
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, __func__, current->pid, token, count, hat);
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hat = next;
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}
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} else
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AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
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__func__, current->pid, token, count, "<NULL>");
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return aa_change_hat(hats, count, token, flags);
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}
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