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/policy_ns.h" 19 #include "include/domain.h" 20 #include "include/procattr.h" 21 22 23 /** 24 * aa_getprocattr - Return the profile information for @profile 25 * @profile: the profile to print profile info about (NOT NULL) 26 * @string: Returns - string containing the profile info (NOT NULL) 27 * 28 * Returns: length of @string on success else error on failure 29 * 30 * Requires: profile != NULL 31 * 32 * Creates a string containing the namespace_name://profile_name for 33 * @profile. 34 * 35 * Returns: size of string placed in @string else error code on failure 36 */ 37 int aa_getprocattr(struct aa_profile *profile, char **string) 38 { 39 char *str; 40 int len = 0, mode_len = 0, ns_len = 0, name_len; 41 const char *mode_str = aa_profile_mode_names[profile->mode]; 42 const char *ns_name = NULL; 43 struct aa_ns *ns = profile->ns; 44 struct aa_ns *current_ns = __aa_current_profile()->ns; 45 char *s; 46 47 if (!aa_ns_visible(current_ns, ns, true)) 48 return -EACCES; 49 50 ns_name = aa_ns_name(current_ns, ns, true); 51 ns_len = strlen(ns_name); 52 53 /* if the visible ns_name is > 0 increase size for : :// seperator */ 54 if (ns_len) 55 ns_len += 4; 56 57 /* unconfined profiles don't have a mode string appended */ 58 if (!unconfined(profile)) 59 mode_len = strlen(mode_str) + 3; /* + 3 for _() */ 60 61 name_len = strlen(profile->base.hname); 62 len = mode_len + ns_len + name_len + 1; /* + 1 for \n */ 63 s = str = kmalloc(len + 1, GFP_KERNEL); /* + 1 \0 */ 64 if (!str) 65 return -ENOMEM; 66 67 if (ns_len) { 68 /* skip over prefix current_ns->base.hname and separating // */ 69 sprintf(s, ":%s://", ns_name); 70 s += ns_len; 71 } 72 if (unconfined(profile)) 73 /* mode string not being appended */ 74 sprintf(s, "%s\n", profile->base.hname); 75 else 76 sprintf(s, "%s (%s)\n", profile->base.hname, mode_str); 77 *string = str; 78 79 /* NOTE: len does not include \0 of string, not saved as part of file */ 80 return len; 81 } 82 83 /** 84 * split_token_from_name - separate a string of form <token>^<name> 85 * @op: operation being checked 86 * @args: string to parse (NOT NULL) 87 * @token: stores returned parsed token value (NOT NULL) 88 * 89 * Returns: start position of name after token else NULL on failure 90 */ 91 static char *split_token_from_name(const char *op, char *args, u64 *token) 92 { 93 char *name; 94 95 *token = simple_strtoull(args, &name, 16); 96 if ((name == args) || *name != '^') { 97 AA_ERROR("%s: Invalid input '%s'", op, args); 98 return ERR_PTR(-EINVAL); 99 } 100 101 name++; /* skip ^ */ 102 if (!*name) 103 name = NULL; 104 return name; 105 } 106 107 /** 108 * aa_setprocattr_chagnehat - handle procattr interface to change_hat 109 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL) 110 * @size: size of the args 111 * @test: true if this is a test of change_hat permissions 112 * 113 * Returns: %0 or error code if change_hat fails 114 */ 115 int aa_setprocattr_changehat(char *args, size_t size, int test) 116 { 117 char *hat; 118 u64 token; 119 const char *hats[16]; /* current hard limit on # of names */ 120 int count = 0; 121 122 hat = split_token_from_name(OP_CHANGE_HAT, args, &token); 123 if (IS_ERR(hat)) 124 return PTR_ERR(hat); 125 126 if (!hat && !token) { 127 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic"); 128 return -EINVAL; 129 } 130 131 if (hat) { 132 /* set up hat name vector, args guaranteed null terminated 133 * at args[size] by setprocattr. 134 * 135 * If there are multiple hat names in the buffer each is 136 * separated by a \0. Ie. userspace writes them pre tokenized 137 */ 138 char *end = args + size; 139 for (count = 0; (hat < end) && count < 16; ++count) { 140 char *next = hat + strlen(hat) + 1; 141 hats[count] = hat; 142 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n" 143 , __func__, current->pid, token, count, hat); 144 hat = next; 145 } 146 } else 147 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n", 148 __func__, current->pid, token, count, "<NULL>"); 149 150 return aa_change_hat(hats, count, token, test); 151 } 152