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 */
aa_getprocattr(struct aa_profile * profile,char ** string)35 int 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 */
split_token_from_name(int op,char * args,u64 * token)89 static 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 */
aa_setprocattr_changehat(char * args,size_t size,int test)113 int 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 */
aa_setprocattr_changeprofile(char * fqname,bool onexec,int test)158 int 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
aa_setprocattr_permipc(char * fqname)166 int aa_setprocattr_permipc(char *fqname)
167 {
168 /* TODO: add ipc permission querying */
169 return -ENOTSUPP;
170 }
171