1/* 2 * AppArmor security module 3 * 4 * This file contains AppArmor /proc/<pid>/attr/ interface functions 5 * 6 * Copyright (C) 1998-2008 Novell/SUSE 7 * Copyright 2009-2010 Canonical Ltd. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License as 11 * published by the Free Software Foundation, version 2 of the 12 * License. 13 */ 14 15#include "include/apparmor.h" 16#include "include/context.h" 17#include "include/policy.h" 18#include "include/domain.h" 19 20 21/** 22 * aa_getprocattr - Return the profile information for @profile 23 * @profile: the profile to print profile info about (NOT NULL) 24 * @string: Returns - string containing the profile info (NOT NULL) 25 * 26 * Returns: length of @string on success else error on failure 27 * 28 * Requires: profile != NULL 29 * 30 * Creates a string containing the namespace_name://profile_name for 31 * @profile. 32 * 33 * Returns: size of string placed in @string else error code on failure 34 */ 35int aa_getprocattr(struct aa_profile *profile, char **string) 36{ 37 char *str; 38 int len = 0, mode_len = 0, ns_len = 0, name_len; 39 const char *mode_str = profile_mode_names[profile->mode]; 40 const char *ns_name = NULL; 41 struct aa_namespace *ns = profile->ns; 42 struct aa_namespace *current_ns = __aa_current_profile()->ns; 43 char *s; 44 45 if (!aa_ns_visible(current_ns, ns)) 46 return -EACCES; 47 48 ns_name = aa_ns_name(current_ns, ns); 49 ns_len = strlen(ns_name); 50 51 /* if the visible ns_name is > 0 increase size for : :// seperator */ 52 if (ns_len) 53 ns_len += 4; 54 55 /* unconfined profiles don't have a mode string appended */ 56 if (!unconfined(profile)) 57 mode_len = strlen(mode_str) + 3; /* + 3 for _() */ 58 59 name_len = strlen(profile->base.hname); 60 len = mode_len + ns_len + name_len + 1; /* + 1 for \n */ 61 s = str = kmalloc(len + 1, GFP_KERNEL); /* + 1 \0 */ 62 if (!str) 63 return -ENOMEM; 64 65 if (ns_len) { 66 /* skip over prefix current_ns->base.hname and separating // */ 67 sprintf(s, ":%s://", ns_name); 68 s += ns_len; 69 } 70 if (unconfined(profile)) 71 /* mode string not being appended */ 72 sprintf(s, "%s\n", profile->base.hname); 73 else 74 sprintf(s, "%s (%s)\n", profile->base.hname, mode_str); 75 *string = str; 76 77 /* NOTE: len does not include \0 of string, not saved as part of file */ 78 return len; 79} 80 81/** 82 * split_token_from_name - separate a string of form <token>^<name> 83 * @op: operation being checked 84 * @args: string to parse (NOT NULL) 85 * @token: stores returned parsed token value (NOT NULL) 86 * 87 * Returns: start position of name after token else NULL on failure 88 */ 89static char *split_token_from_name(int op, char *args, u64 * token) 90{ 91 char *name; 92 93 *token = simple_strtoull(args, &name, 16); 94 if ((name == args) || *name != '^') { 95 AA_ERROR("%s: Invalid input '%s'", op_table[op], args); 96 return ERR_PTR(-EINVAL); 97 } 98 99 name++; /* skip ^ */ 100 if (!*name) 101 name = NULL; 102 return name; 103} 104 105/** 106 * aa_setprocattr_chagnehat - handle procattr interface to change_hat 107 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL) 108 * @size: size of the args 109 * @test: true if this is a test of change_hat permissions 110 * 111 * Returns: %0 or error code if change_hat fails 112 */ 113int aa_setprocattr_changehat(char *args, size_t size, int test) 114{ 115 char *hat; 116 u64 token; 117 const char *hats[16]; /* current hard limit on # of names */ 118 int count = 0; 119 120 hat = split_token_from_name(OP_CHANGE_HAT, args, &token); 121 if (IS_ERR(hat)) 122 return PTR_ERR(hat); 123 124 if (!hat && !token) { 125 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic"); 126 return -EINVAL; 127 } 128 129 if (hat) { 130 /* set up hat name vector, args guaranteed null terminated 131 * at args[size] by setprocattr. 132 * 133 * If there are multiple hat names in the buffer each is 134 * separated by a \0. Ie. userspace writes them pre tokenized 135 */ 136 char *end = args + size; 137 for (count = 0; (hat < end) && count < 16; ++count) { 138 char *next = hat + strlen(hat) + 1; 139 hats[count] = hat; 140 hat = next; 141 } 142 } 143 144 AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n", 145 __func__, token, hat ? hat : NULL); 146 147 return aa_change_hat(hats, count, token, test); 148} 149 150/** 151 * aa_setprocattr_changeprofile - handle procattr interface to changeprofile 152 * @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL) 153 * @onexec: true if change_profile should be delayed until exec 154 * @test: true if this is a test of change_profile permissions 155 * 156 * Returns: %0 or error code if change_profile fails 157 */ 158int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test) 159{ 160 char *name, *ns_name; 161 162 name = aa_split_fqname(fqname, &ns_name); 163 return aa_change_profile(ns_name, name, onexec, test); 164} 165 166int aa_setprocattr_permipc(char *fqname) 167{ 168 /* TODO: add ipc permission querying */ 169 return -ENOTSUPP; 170} 171