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/context.h"
17#include "include/policy.h"
18#include "include/domain.h"
19
20
21/**
22 * aa_getprocattr - Return the profile information for @profile
23 * @profile: the profile to print profile info about (NOT NULL)
24 * @string: Returns - string containing the profile info (NOT NULL)
25 *
26 * Returns: length of @string on success else error on failure
27 *
28 * Requires: profile != NULL
29 *
30 * Creates a string containing the namespace_name://profile_name for
31 * @profile.
32 *
33 * Returns: size of string placed in @string else error code on failure
34 */
35int aa_getprocattr(struct aa_profile *profile, char **string)
36{
37 char *str;
38 int len = 0, mode_len = 0, ns_len = 0, name_len;
39 const char *mode_str = profile_mode_names[profile->mode];
40 const char *ns_name = NULL;
41 struct aa_namespace *ns = profile->ns;
42 struct aa_namespace *current_ns = __aa_current_profile()->ns;
43 char *s;
44
45 if (!aa_ns_visible(current_ns, ns))
46 return -EACCES;
47
48 ns_name = aa_ns_name(current_ns, ns);
49 ns_len = strlen(ns_name);
50
51 /* if the visible ns_name is > 0 increase size for : :// seperator */
52 if (ns_len)
53 ns_len += 4;
54
55 /* unconfined profiles don't have a mode string appended */
56 if (!unconfined(profile))
57 mode_len = strlen(mode_str) + 3; /* + 3 for _() */
58
59 name_len = strlen(profile->base.hname);
60 len = mode_len + ns_len + name_len + 1; /* + 1 for \n */
61 s = str = kmalloc(len + 1, GFP_KERNEL); /* + 1 \0 */
62 if (!str)
63 return -ENOMEM;
64
65 if (ns_len) {
66 /* skip over prefix current_ns->base.hname and separating // */
67 sprintf(s, ":%s://", ns_name);
68 s += ns_len;
69 }
70 if (unconfined(profile))
71 /* mode string not being appended */
72 sprintf(s, "%s\n", profile->base.hname);
73 else
74 sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);
75 *string = str;
76
77 /* NOTE: len does not include \0 of string, not saved as part of file */
78 return len;
79}
80
81/**
82 * split_token_from_name - separate a string of form <token>^<name>
83 * @op: operation being checked
84 * @args: string to parse (NOT NULL)
85 * @token: stores returned parsed token value (NOT NULL)
86 *
87 * Returns: start position of name after token else NULL on failure
88 */
89static char *split_token_from_name(int op, char *args, u64 * token)
90{
91 char *name;
92
93 *token = simple_strtoull(args, &name, 16);
94 if ((name == args) || *name != '^') {
95 AA_ERROR("%s: Invalid input '%s'", op_table[op], args);
96 return ERR_PTR(-EINVAL);
97 }
98
99 name++; /* skip ^ */
100 if (!*name)
101 name = NULL;
102 return name;
103}
104
105/**
106 * aa_setprocattr_chagnehat - handle procattr interface to change_hat
107 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
108 * @size: size of the args
109 * @test: true if this is a test of change_hat permissions
110 *
111 * Returns: %0 or error code if change_hat fails
112 */
113int aa_setprocattr_changehat(char *args, size_t size, int test)
114{
115 char *hat;
116 u64 token;
117 const char *hats[16]; /* current hard limit on # of names */
118 int count = 0;
119
120 hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
121 if (IS_ERR(hat))
122 return PTR_ERR(hat);
123
124 if (!hat && !token) {
125 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
126 return -EINVAL;
127 }
128
129 if (hat) {
130 /* set up hat name vector, args guaranteed null terminated
131 * at args[size] by setprocattr.
132 *
133 * If there are multiple hat names in the buffer each is
134 * separated by a \0. Ie. userspace writes them pre tokenized
135 */
136 char *end = args + size;
137 for (count = 0; (hat < end) && count < 16; ++count) {
138 char *next = hat + strlen(hat) + 1;
139 hats[count] = hat;
140 hat = next;
141 }
142 }
143
144 AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",
145 __func__, token, hat ? hat : NULL);
146
147 return aa_change_hat(hats, count, token, test);
148}
149
150/**
151 * aa_setprocattr_changeprofile - handle procattr interface to changeprofile
152 * @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
153 * @onexec: true if change_profile should be delayed until exec
154 * @test: true if this is a test of change_profile permissions
155 *
156 * Returns: %0 or error code if change_profile fails
157 */
158int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
159{
160 char *name, *ns_name;
161
162 name = aa_split_fqname(fqname, &ns_name);
163 return aa_change_profile(ns_name, name, onexec, test);
164}
165
166int aa_setprocattr_permipc(char *fqname)
167{
168 /* TODO: add ipc permission querying */
169 return -ENOTSUPP;
170}
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}