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