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