Loading...
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/cred.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 */
37int aa_getprocattr(struct aa_label *label, char **string)
38{
39 struct aa_ns *ns = labels_ns(label);
40 struct aa_ns *current_ns = aa_get_current_ns();
41 int len;
42
43 if (!aa_ns_visible(current_ns, ns, true)) {
44 aa_put_ns(current_ns);
45 return -EACCES;
46 }
47
48 len = aa_label_snxprint(NULL, 0, current_ns, label,
49 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
50 FLAG_HIDDEN_UNCONFINED);
51 AA_BUG(len < 0);
52
53 *string = kmalloc(len + 2, GFP_KERNEL);
54 if (!*string) {
55 aa_put_ns(current_ns);
56 return -ENOMEM;
57 }
58
59 len = aa_label_snxprint(*string, len + 2, current_ns, label,
60 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
61 FLAG_HIDDEN_UNCONFINED);
62 if (len < 0) {
63 aa_put_ns(current_ns);
64 return len;
65 }
66
67 (*string)[len] = '\n';
68 (*string)[len + 1] = 0;
69
70 aa_put_ns(current_ns);
71 return len + 1;
72}
73
74/**
75 * split_token_from_name - separate a string of form <token>^<name>
76 * @op: operation being checked
77 * @args: string to parse (NOT NULL)
78 * @token: stores returned parsed token value (NOT NULL)
79 *
80 * Returns: start position of name after token else NULL on failure
81 */
82static char *split_token_from_name(const char *op, char *args, u64 *token)
83{
84 char *name;
85
86 *token = simple_strtoull(args, &name, 16);
87 if ((name == args) || *name != '^') {
88 AA_ERROR("%s: Invalid input '%s'", op, args);
89 return ERR_PTR(-EINVAL);
90 }
91
92 name++; /* skip ^ */
93 if (!*name)
94 name = NULL;
95 return name;
96}
97
98/**
99 * aa_setprocattr_chagnehat - handle procattr interface to change_hat
100 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
101 * @size: size of the args
102 * @flags: set of flags governing behavior
103 *
104 * Returns: %0 or error code if change_hat fails
105 */
106int aa_setprocattr_changehat(char *args, size_t size, int flags)
107{
108 char *hat;
109 u64 token;
110 const char *hats[16]; /* current hard limit on # of names */
111 int count = 0;
112
113 hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
114 if (IS_ERR(hat))
115 return PTR_ERR(hat);
116
117 if (!hat && !token) {
118 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
119 return -EINVAL;
120 }
121
122 if (hat) {
123 /* set up hat name vector, args guaranteed null terminated
124 * at args[size] by setprocattr.
125 *
126 * If there are multiple hat names in the buffer each is
127 * separated by a \0. Ie. userspace writes them pre tokenized
128 */
129 char *end = args + size;
130 for (count = 0; (hat < end) && count < 16; ++count) {
131 char *next = hat + strlen(hat) + 1;
132 hats[count] = hat;
133 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
134 , __func__, current->pid, token, count, hat);
135 hat = next;
136 }
137 } else
138 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
139 __func__, current->pid, token, count, "<NULL>");
140
141 return aa_change_hat(hats, count, token, flags);
142}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor /proc/<pid>/attr/ interface functions
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#include "include/apparmor.h"
12#include "include/cred.h"
13#include "include/policy.h"
14#include "include/policy_ns.h"
15#include "include/domain.h"
16#include "include/procattr.h"
17
18
19/**
20 * aa_getprocattr - Return the label information for @label
21 * @label: the label to print label info about (NOT NULL)
22 * @string: Returns - string containing the label info (NOT NULL)
23 *
24 * Requires: label != NULL && string != NULL
25 *
26 * Creates a string containing the label information for @label.
27 *
28 * Returns: size of string placed in @string else error code on failure
29 */
30int aa_getprocattr(struct aa_label *label, char **string)
31{
32 struct aa_ns *ns = labels_ns(label);
33 struct aa_ns *current_ns = aa_get_current_ns();
34 int len;
35
36 if (!aa_ns_visible(current_ns, ns, true)) {
37 aa_put_ns(current_ns);
38 return -EACCES;
39 }
40
41 len = aa_label_snxprint(NULL, 0, current_ns, label,
42 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
43 FLAG_HIDDEN_UNCONFINED);
44 AA_BUG(len < 0);
45
46 *string = kmalloc(len + 2, GFP_KERNEL);
47 if (!*string) {
48 aa_put_ns(current_ns);
49 return -ENOMEM;
50 }
51
52 len = aa_label_snxprint(*string, len + 2, current_ns, label,
53 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
54 FLAG_HIDDEN_UNCONFINED);
55 if (len < 0) {
56 aa_put_ns(current_ns);
57 return len;
58 }
59
60 (*string)[len] = '\n';
61 (*string)[len + 1] = 0;
62
63 aa_put_ns(current_ns);
64 return len + 1;
65}
66
67/**
68 * split_token_from_name - separate a string of form <token>^<name>
69 * @op: operation being checked
70 * @args: string to parse (NOT NULL)
71 * @token: stores returned parsed token value (NOT NULL)
72 *
73 * Returns: start position of name after token else NULL on failure
74 */
75static char *split_token_from_name(const char *op, char *args, u64 *token)
76{
77 char *name;
78
79 *token = simple_strtoull(args, &name, 16);
80 if ((name == args) || *name != '^') {
81 AA_ERROR("%s: Invalid input '%s'", op, args);
82 return ERR_PTR(-EINVAL);
83 }
84
85 name++; /* skip ^ */
86 if (!*name)
87 name = NULL;
88 return name;
89}
90
91/**
92 * aa_setprocattr_changehat - handle procattr interface to change_hat
93 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
94 * @size: size of the args
95 * @flags: set of flags governing behavior
96 *
97 * Returns: %0 or error code if change_hat fails
98 */
99int aa_setprocattr_changehat(char *args, size_t size, int flags)
100{
101 char *hat;
102 u64 token;
103 const char *hats[16]; /* current hard limit on # of names */
104 int count = 0;
105
106 hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
107 if (IS_ERR(hat))
108 return PTR_ERR(hat);
109
110 if (!hat && !token) {
111 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
112 return -EINVAL;
113 }
114
115 if (hat) {
116 /* set up hat name vector, args guaranteed null terminated
117 * at args[size] by setprocattr.
118 *
119 * If there are multiple hat names in the buffer each is
120 * separated by a \0. Ie. userspace writes them pre tokenized
121 */
122 char *end = args + size;
123 for (count = 0; (hat < end) && count < 16; ++count) {
124 char *next = hat + strlen(hat) + 1;
125 hats[count] = hat;
126 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
127 , __func__, current->pid, token, count, hat);
128 hat = next;
129 }
130 } else
131 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
132 __func__, current->pid, token, count, "<NULL>");
133
134 return aa_change_hat(hats, count, token, flags);
135}