John Johansen | 63e2b42 | 2010-07-29 14:48:03 -0700 | [diff] [blame] | 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" |
James Morris | cc7db09 | 2011-08-29 11:45:44 +1000 | [diff] [blame] | 19 | #include "include/procattr.h" |
John Johansen | 63e2b42 | 2010-07-29 14:48:03 -0700 | [diff] [blame] | 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 = 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 | |
| 167 | int aa_setprocattr_permipc(char *fqname) |
| 168 | { |
| 169 | /* TODO: add ipc permission querying */ |
| 170 | return -ENOTSUPP; |
| 171 | } |