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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - security/apparmor/procattr.c
2 * AppArmor security module
4 * This file contains AppArmor /proc/<pid>/attr/ interface functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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
15 #include "include/apparmor.h"
16 #include "include/context.h"
17 #include "include/policy.h"
18 #include "include/domain.h"
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)
26 * Returns: length of @string on success else error on failure
28 * Requires: profile != NULL
30 * Creates a string containing the namespace_name://profile_name for
33 * Returns: size of string placed in @string else error code on failure
35 int aa_getprocattr(struct aa_profile
*profile
, char **string
)
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
;
45 if (!aa_ns_visible(current_ns
, ns
))
48 ns_name
= aa_ns_name(current_ns
, ns
);
49 ns_len
= strlen(ns_name
);
51 /* if the visible ns_name is > 0 increase size for : :// seperator */
55 /* unconfined profiles don't have a mode string appended */
56 if (!unconfined(profile
))
57 mode_len
= strlen(mode_str
) + 3; /* + 3 for _() */
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 */
66 /* skip over prefix current_ns->base.hname and separating // */
67 sprintf(s
, ":%s://", ns_name
);
70 if (unconfined(profile
))
71 /* mode string not being appended */
72 sprintf(s
, "%s\n", profile
->base
.hname
);
74 sprintf(s
, "%s (%s)\n", profile
->base
.hname
, mode_str
);
77 /* NOTE: len does not include \0 of string, not saved as part of file */
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)
87 * Returns: start position of name after token else NULL on failure
89 static char *split_token_from_name(int op
, char *args
, u64
* token
)
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
);
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
111 * Returns: %0 or error code if change_hat fails
113 int aa_setprocattr_changehat(char *args
, size_t size
, int test
)
117 const char *hats
[16]; /* current hard limit on # of names */
120 hat
= split_token_from_name(OP_CHANGE_HAT
, args
, &token
);
124 if (!hat
&& !token
) {
125 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
130 /* set up hat name vector, args guaranteed null terminated
131 * at args[size] by setprocattr.
133 * If there are multiple hat names in the buffer each is
134 * separated by a \0. Ie. userspace writes them pre tokenized
136 char *end
= args
+ size
;
137 for (count
= 0; (hat
< end
) && count
< 16; ++count
) {
138 char *next
= hat
+ strlen(hat
) + 1;
144 AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",
145 __func__
, token
, hat
? hat
: NULL
);
147 return aa_change_hat(hats
, count
, token
, test
);
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
156 * Returns: %0 or error code if change_profile fails
158 int aa_setprocattr_changeprofile(char *fqname
, bool onexec
, int test
)
160 char *name
, *ns_name
;
162 name
= aa_split_fqname(fqname
, &ns_name
);
163 return aa_change_profile(ns_name
, name
, onexec
, test
);
166 int aa_setprocattr_permipc(char *fqname
)
168 /* TODO: add ipc permission querying */