aboutsummaryrefslogtreecommitdiffstats
path: root/security/apparmor/procattr.c
blob: 1b41c542d376721646ba67dc4f17a3e21e1f241f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/*
 * AppArmor security module
 *
 * This file contains AppArmor /proc/<pid>/attr/ interface functions
 *
 * Copyright (C) 1998-2008 Novell/SUSE
 * Copyright 2009-2010 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 */

#include "include/apparmor.h"
#include "include/context.h"
#include "include/policy.h"
#include "include/domain.h"
#include "include/procattr.h"


/**
 * aa_getprocattr - Return the profile information for @profile
 * @profile: the profile to print profile info about  (NOT NULL)
 * @string: Returns - string containing the profile info (NOT NULL)
 *
 * Returns: length of @string on success else error on failure
 *
 * Requires: profile != NULL
 *
 * Creates a string containing the namespace_name://profile_name for
 * @profile.
 *
 * Returns: size of string placed in @string else error code on failure
 */
int aa_getprocattr(struct aa_profile *profile, char **string)
{
	char *str;
	int len = 0, mode_len = 0, ns_len = 0, name_len;
	const char *mode_str = profile_mode_names[profile->mode];
	const char *ns_name = NULL;
	struct aa_namespace *ns = profile->ns;
	struct aa_namespace *current_ns = __aa_current_profile()->ns;
	char *s;

	if (!aa_ns_visible(current_ns, ns))
		return -EACCES;

	ns_name = aa_ns_name(current_ns, ns);
	ns_len = strlen(ns_name);

	/* if the visible ns_name is > 0 increase size for : :// seperator */
	if (ns_len)
		ns_len += 4;

	/* unconfined profiles don't have a mode string appended */
	if (!unconfined(profile))
		mode_len = strlen(mode_str) + 3;	/* + 3 for _() */

	name_len = strlen(profile->base.hname);
	len = mode_len + ns_len + name_len + 1;	    /* + 1 for \n */
	s = str = kmalloc(len + 1, GFP_KERNEL);	    /* + 1 \0 */
	if (!str)
		return -ENOMEM;

	if (ns_len) {
		/* skip over prefix current_ns->base.hname and separating // */
		sprintf(s, ":%s://", ns_name);
		s += ns_len;
	}
	if (unconfined(profile))
		/* mode string not being appended */
		sprintf(s, "%s\n", profile->base.hname);
	else
		sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);
	*string = str;

	/* NOTE: len does not include \0 of string, not saved as part of file */
	return len;
}

/**
 * split_token_from_name - separate a string of form  <token>^<name>
 * @op: operation being checked
 * @args: string to parse  (NOT NULL)
 * @token: stores returned parsed token value  (NOT NULL)
 *
 * Returns: start position of name after token else NULL on failure
 */
static char *split_token_from_name(int op, char *args, u64 * token)
{
	char *name;

	*token = simple_strtoull(args, &name, 16);
	if ((name == args) || *name != '^') {
		AA_ERROR("%s: Invalid input '%s'", op_table[op], args);
		return ERR_PTR(-EINVAL);
	}

	name++;			/* skip ^ */
	if (!*name)
		name = NULL;
	return name;
}

/**
 * aa_setprocattr_chagnehat - handle procattr interface to change_hat
 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
 * @size: size of the args
 * @test: true if this is a test of change_hat permissions
 *
 * Returns: %0 or error code if change_hat fails
 */
int aa_setprocattr_changehat(char *args, size_t size, int test)
{
	char *hat;
	u64 token;
	const char *hats[16];		/* current hard limit on # of names */
	int count = 0;

	hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
	if (IS_ERR(hat))
		return PTR_ERR(hat);

	if (!hat && !token) {
		AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
		return -EINVAL;
	}

	if (hat) {
		/* set up hat name vector, args guaranteed null terminated
		 * at args[size] by setprocattr.
		 *
		 * If there are multiple hat names in the buffer each is
		 * separated by a \0.  Ie. userspace writes them pre tokenized
		 */
		char *end = args + size;
		for (count = 0; (hat < end) && count < 16; ++count) {
			char *next = hat + strlen(hat) + 1;
			hats[count] = hat;
			hat = next;
		}
	}

	AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",
		 __func__, token, hat ? hat : NULL);

	return aa_change_hat(hats, count, token, test);
}

/**
 * aa_setprocattr_changeprofile - handle procattr interface to changeprofile
 * @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
 * @onexec: true if change_profile should be delayed until exec
 * @test: true if this is a test of change_profile permissions
 *
 * Returns: %0 or error code if change_profile fails
 */
int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
{
	char *name, *ns_name;

	name = aa_split_fqname(fqname, &ns_name);
	return aa_change_profile(ns_name, name, onexec, test);
}

int aa_setprocattr_permipc(char *fqname)
{
	/* TODO: add ipc permission querying */
	return -ENOTSUPP;
}